veomark.com

300 free online tools and calculators

Finance, creators, developer, daily utilities, and image and design. Instant, browser-side, no signup.

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Search by name, filter by category or status, and cluster results your way.

Finance & Money PayPal Fee Calculator Exact net, gross, and invoice amount after PayPal fees.

Finance & Money Stripe Fee Calculator Domestic, international, FX, and ACH fees - net payout and invoice gross-up.

Finance & Money Etsy Profit Margin Calculator Listing, 6.5% transaction, payments, Offsite Ads, COGS, and postage vs net profit.

Finance & Money Shopify Profit Margin Calculator Plan-tier gateway fees, COGS, and ads vs profit per item and monthly net.

Finance & Money Freelance Hourly Rate Calculator Minimum billable rate from take-home, overhead, tax, PTO weeks, and hours.

Finance & Money Crypto Profit/Loss Calculator Buy vs sell price, fees, and P/L.

Finance & Money Simple Loan EMI Calculator Monthly EMI, interest, and tenure.

Finance & Money Discount & Sales Price Calculator Percent off, sale price, and original price.

Finance & Money VAT / GST Tax Calculator Tax-inclusive and tax-exclusive amounts.

Finance & Money Compound Interest Calculator Principal, rate, and compounding periods.

Finance & Money Freelance Rate & Project Scope Calculator Hourly, daily, and project quotes after tax, PTO, overhead, and profit margin.

Finance & Money SaaS LTV Calculator Churn, LTV, LTV:CAC ratio, CAC payback, and 12-month revenue.

Finance & Money Amazon FBA Fee Calculator Referral, FBA fulfillment, unit margin, and ROI after COGS and inbound.

Finance & Money Startup Runway Calculator Month-by-month cash runway from burn, revenue growth, and capex - plus zero-cash date.

Finance & Money Break-Even Calculator Monthly units and revenue to cover fixed costs after contribution margin.

Finance & Money ROI Calculator Simple ROI, net profit or loss, and annualized CAGR from initial, final, and years.

Finance & Money ROAS Calculator Platform ROAS vs true net profit after COGS, payment fees, and shipping.

Finance & Money Churn Rate Calculator Logo churn, gross and net revenue churn, retention, and implied customer lifespan.

Finance & Money CAC Payback Calculator Gross-margin-adjusted CAC payback, capital-adjusted months, and LTV:CAC preview.

Finance & Money Working Capital Calculator Net working capital, current ratio, and quick ratio from cash, AR, inventory, and payables.

Finance & Money Upwork Fee Calculator Per-contract 0% to 15% freelancer service fee, withdrawals, tax, and inverse invoice gross-up.

Social & Creators TikTok Engagement Rate Calculator Follower or view ER, 5-video average, tier badge, and brand-deal range.

Social & Creators Instagram Engagement Rate Calculator Follower ER from likes, comments, and saves, with grade and like-to-comment ratio.

Social & Creators YouTube Channel Money Estimator Views times niche CPM ranges.

Social & Creators TikTok Money Calculator Views, gifts, and creator-fund estimates.

Social & Creators YouTube Shorts RPM / Earnings Estimator Shorts views times RPM.

Social & Creators Social Media Bio Font Generator Unicode bold, italic, and fancy text.

Social & Creators Hashtag Clean & Format Tool Dedupe, spacing, and hash prefixes.

Social & Creators Tweet / X Character Counter Character count with line-break formatting.

Social & Creators Instagram Grid Preview Splitter Split an image into grid dimensions.

Social & Creators Video Aspect Ratio Calculator Convert 16:9 to 9:16 dimensions.

Social & Creators YouTube RPM Calculator AdSense RPM/CPM by niche and geo, Shorts vs long-form, extra streams.

Social & Creators UTM Builder & Campaign Link Generator Campaign URLs with source, medium, lowercase, space rules, copy, and QR.

Developer & Webmaster JSON Formatter & Validator Pretty-print JSON and surface syntax errors.

Developer & Webmaster Base64 Encoder / Decoder UTF-8 and emoji-safe encode/decode, Standard or URL-safe, with byte telemetry.

Developer & Webmaster HTML to Markdown Converter Convert HTML tags to Markdown.

Developer & Webmaster CSS Box-Shadow Generator Live preview and copy-ready CSS.

Developer & Webmaster CSS Gradient Generator Linear and radial gradients.

Developer & Webmaster UUID / GUID Generator Generate version-4 identifiers.

Developer & Webmaster URL Encoder / Decoder Percent-encode and decode URLs.

Developer & Webmaster Color Code Converter HEX, RGB, and HSL conversion.

Developer & Webmaster Meta Tags Generator Open Graph and Twitter Card tags.

Developer & Webmaster Robots.txt Generator Allow, disallow, and sitemap URL.

Developer & Webmaster JSON to YAML Converter Validate JSON in the browser and dump YAML with 2 or 4 space indent.

Developer & Webmaster CSS Minifier & Optimizer Strip comments, shorten hex, and see original vs minified bytes saved.

Developer & Webmaster Cron Expression Generator 5-field crontab builder, English explanation, and next 5 local run times.

Developer & Webmaster JWT Decoder Inspect header, payload, exp/nbf status, and alg none without uploading the token.

Developer & Webmaster JSON Formatter and Minifier 2-space, 4-space, tab, or compact JSON with auto-fix and line/column errors.

Developer & Webmaster Regex Tester JavaScript regex flags, match table with groups, presets, and a 20k ReDoS cap.

Daily Utilities Online Word & Character Counter Counts plus estimated reading time.

Daily Utilities Case Converter UPPERCASE, lowercase, and Title Case.

Daily Utilities Duplicate Line Remover Unique lines, original order kept.

Daily Utilities Lorem Ipsum Text Generator Words, sentences, and paragraphs.

Daily Utilities Password Generator Custom length and special symbols.

Daily Utilities QR Code Generator Static QR codes in the browser.

Daily Utilities Age Calculator Exact years, months, days, and hours.

Daily Utilities Date Difference Calculator Days between two dates.

Daily Utilities Percentage Calculator X% of Y, or percent increase/decrease.

Daily Utilities Time Zone Converter Convert times across city offsets.

Daily Utilities BMR and TDEE Calculator Mifflin-St Jeor BMR, TDEE, 20% loss and 15% surplus calorie targets.

Daily Utilities Macro Nutrient Calculator Protein, carb, and fat grams from calories, with a fat-loss protein check.

Daily Utilities Daily Water Intake Calculator Daily water from weight, exercise minutes, and climate, in oz, liters, or cups.

Image & Design SVG to PNG Converter Convert SVG to PNG in the browser.

Image & Design Image Dimension Resizer Resize width and height, then download.

Image & Design Aspect Ratio Calculator 4:3, 16:9, and 1:1 crop math.

Image & Design Color Picker from Image Sample colors from a canvas image.

Image & Design Favicon HTML Tag Builder from Upload Preview a 32x32 canvas draw and copy HTML link tags for common favicon sizes. Does not emit ICO files.

Image & Design Image Crop Ratio Calculator Target crop-box dimensions.

Image & Design PNG Size Reducer (Canvas Downscale) Redraw a PNG at a smaller pixel scale and re-encode. Not a pngquant or oxipng optimizer.

Image & Design PX to REM / EM Converter Convert pixels using a base font size.

Image & Design Pencil / Sketch Canvas Tool Draw in the browser and download.

Image & Design Web Safe Fonts Preview Tool Preview stacks on sample text.

Finance & Money Mortgage Payment & Amortization Calculator Monthly principal and interest, total interest, and payoff from loan amount, APR, and term.

Finance & Money Debt Payoff Snowball vs Avalanche Calculator Compare snowball and avalanche payoff months and interest on two debts plus extra payment.

Finance & Money Rental Property Cash Flow & Cap Rate Calculator NOI, cap rate, cash-on-cash, and monthly cash flow from rent, expenses, and financing.

Finance & Money Car Lease vs Buy Calculator Compare total cash out for a lease versus a loan purchase over the same term.

Finance & Money Emergency Fund Savings Goal Calculator Months of expenses to a target fund, monthly save amount, and date you hit the goal.

Finance & Money Auto Loan Payment & Depreciation Calculator Monthly car payment versus estimated residual value so you can see equity at a chosen year.

Finance & Money Refinance Break-Even & Savings Calculator Months to recoup closing costs and lifetime interest saved versus keeping the current loan.

Finance & Money Side Hustle Tax Estimator (1099) Self-employment tax and a rough federal income-tax band on 1099 profit after expenses.

Finance & Money Personal Net Worth Calculator Assets minus liabilities across cash, investments, home equity, and common debts.

Finance & Money College Savings & 529 Growth Calculator Future value of a 529-style account from seed, monthly contributions, years, and assumed return.

Finance & Money Roth IRA vs Traditional IRA Growth Calculator After-tax future value of Roth versus traditional at a chosen withdrawal tax rate.

Finance & Money Dividend Reinvestment (DRIP) Calculator Share count and ending value when dividends are reinvested at a constant yield and price growth.

Finance & Money Stock Option & RSU Value Estimator Gross and after-tax value of RSUs or options from shares, FMV, strike, and a flat tax rate.

Finance & Money Inflation Adjusted Purchasing Power Calculator What today's dollars buy after N years at a constant inflation rate, and the real value of a future sum.

Finance & Money Inflation Impact Savings Calculator Real ending value of a savings balance when the yield is below (or above) inflation.

Finance & Money Commercial Lease Rate Calculator (per SQFT) Annual and monthly rent from rentable square feet, rate per SF, and extra NNN or CAM load.

Finance & Money Property Tax Estimator & Comparison Tool Estimated annual and monthly tax from assessed value and millage, plus a second-jurisdiction compare.

Finance & Money Home Affordability & Max Income Ratio Calculator Max purchase price from income, debts, rate, and a chosen housing-ratio cap (28/36 style).

Finance & Money Real Estate Agent Commission Split Calculator Listing and buyer-side dollars from sale price, total commission, and office split.

Finance & Money Hard Money Loan Interest Calculator Prepaid points, monthly interest, and annualized cost on a short-term hard-money loan.

Finance & Money Invoice Late Fee Penalty Calculator Flat fee plus periodic interest on an unpaid invoice after the grace period.

Finance & Money Credit Card Minimum Payment vs Payoff Calculator Months and interest if you pay only the minimum versus a fixed extra payment.

Finance & Money Merchant Processor Interchange-Plus Fee Calculator Processor cost from interchange percent, per-item, and markup on a ticket and monthly volume.

Finance & Money Subscription Box Profitability Calculator Per-box contribution and monthly net after COGS, pick-pack, shipping, and payment fees.

Finance & Money Consulting Retainer Pricing Calculator Monthly retainer from hours reserved, billable rate, utilization, and a risk buffer.

Finance & Money Small Business Loan SBA Payment Estimator Estimated monthly payment and total interest on an SBA-style amortizing term loan.

Finance & Money Employee Turnover Cost Estimator Replacement cost from salary, vacancy months, recruiting, and ramp productivity loss.

Finance & Money Employee vs Contractor Cost Comparison Tool Fully loaded W-2 cost versus 1099 bill rate for the same monthly hours.

Finance & Money Equipment Depreciation Calculator (MACRS / Straight-Line) Year-1 deduction under straight-line or 5-year MACRS half-year for a piece of equipment.

Finance & Money Inventory Holding Cost Calculator Annual carrying cost from average inventory value, storage, capital, shrink, and service.

Finance & Money Gross Margin vs Markup Percentage Converter Convert markup on cost to gross margin on price, and the reverse, with dollar examples.

Finance & Money Inventory Turnover Ratio Calculator Turns and days on hand from COGS and average inventory.

Finance & Money Accounts Receivable Turnover Calculator AR turns from credit sales and average receivables, with implied collection days.

Finance & Money Days Sales Outstanding (DSO) Calculator DSO from ending AR and a chosen trailing sales window (30, 60, or 90 days).

Finance & Money Enterprise Value (EV) to EBITDA Calculator EV and EV/EBITDA from equity value, net debt, and trailing EBITDA.

Finance & Money Burn Multiple & Capital Efficiency Calculator Burn multiple from net burn over net-new ARR in the same period.

Finance & Money SaaS Rule of 40 Benchmark Calculator Growth plus profit margin versus the Rule of 40 line, with the gap in points.

Finance & Money SaaS Magic Number Calculator Sales efficiency from this-quarter net-new ARR versus last-quarter S&M spend.

Finance & Money Net Revenue Retention (NRR) Calculator NRR from starting ARR, expansion, contraction, and churned ARR.

Finance & Money Expansion MRR & Contraction Calculator Net MRR movement from new, expansion, reactivation, contraction, and churn.

Finance & Money Customer Lifetime Value to CAC Ratio Calculator LTV:CAC from ARPU, gross margin, monthly churn, and fully loaded CAC.

Finance & Money Stock Option Exercise Cost & AMT Tax Estimator Cash to exercise plus a rough AMT on the ISO bargain element at a flat AMT rate.

Finance & Money Crypto Staking Yield & APY Calculator Projected token and USD value from principal, APY, compound frequency, and lock months.

Finance & Money Crypto Dollar-Cost Averaging (DCA) Return Estimator Average cost and paper P/L from equal buys over N periods at a start and end price path.

Finance & Money Crypto Liquidity Pool Impermanent Loss Calculator Impermanent loss versus HODL for a 50/50 pool when one asset moves relative to the other.

Finance & Money eBay Profit & Final Value Fee Calculator Net after eBay final-value percent, per-order fee, shipping you ate, and COGS.

Finance & Money Mercari Fee & Net Earnings Calculator Seller net after Mercari selling fee and shipping you cover versus buyer-paid labels.

Finance & Money Poshmark Sales Profit Calculator Net after Poshmark commission, shipping discount you offer, and item cost.

Finance & Money Amazon FBA Storage Fee Estimator Monthly and aged storage from cubic feet, rate per cu ft, and long-term surcharge.

Finance & Money Amazon Merch by Demand Royalty Calculator Royalty per shirt from list price minus Amazon product cost on Merch on Demand.

Finance & Money Etsy Listing Fee Renewal Estimator Monthly listing cash from active listings, $0.20 auto-renews, and optional auto-renew on sale.

Finance & Money Walmart Marketplace Fee & Margin Calculator Net after referral percent, per-item fee, fulfillment, COGS, and ads.

Finance & Money WooCommerce vs Shopify Monthly Fee Comparison Tool Monthly platform plus gateway cost on the same GMV for a Woo stack versus a Shopify plan.

Finance & Money Product Packaging Box Dimension & Shipping Weight Calculator Dimensional weight versus actual weight so you can see which one a carrier will bill.

Finance & Money Free Shipping Threshold Profitability Estimator Margin after you gift shipping once the cart crosses a free-shipping threshold.

Finance & Money Return Rate Cost & Margin Impact Calculator True margin after a return rate, outbound cost you cannot reclaim, and restock fees.

Finance & Money E-Commerce Cart Abandonment Recovery Loss Estimator Lost GMV and recoverable dollars from sessions, add-to-cart rate, abandon rate, and AOV.

Social & Creators Influencer Sponsored Post Rate Estimator A planning rate from followers, engagement, niche CPM, and usage-rights multiplier.

Social & Creators Creator Brand Deal Rate & Usage Rights Calculator Deal total from a base fee, paid usage months, exclusivity, and whitelisting seats.

Social & Creators Substack / Beehiiv Newsletter Revenue Calculator Paid-sub and sponsor revenue after platform take-rate on a newsletter list.

Social & Creators Patreon / Memberful Subscription Income Estimator Net membership income after platform fees across up to three tiers.

Social & Creators Twitch Streamer Sub & Ad Earnings Estimator Monthly estimate from subs, bits, and ad minutes using planning RPMs.

Social & Creators Podcast Sponsor CPM & Earnings Estimator Host-read estimate from downloads, CPM, and reads per episode across a month.

Social & Creators Audio / Video File Transcription Cost Estimator Transcript cost from duration, per-minute rate, speaker count, and rush multiplier.

Social & Creators Video Production Budget & Hourly Estimator Shoot budget from crew hours, day rate, gear, and edit hours.

Social & Creators YouTube Video Title Length & Character Counter Title length versus the 100-character limit and a 70-character search-trim warning.

Social & Creators YouTube Thumbnail Aspect Ratio & Safe-Zone Previewer Pixel size and safe-zone box for a 16:9 YouTube thumbnail at 1280x720.

Social & Creators TikTok Video Length & Character Counter Caption characters versus a 2,200 limit and a duration check against a max seconds field.

Social & Creators Pinterest Pin Image Dimension Splitter & Scaler Target pin pixels from a source width and a 2:3 or custom ratio.

Social & Creators LinkedIn Post Character & Line Break Cleaner Count toward 3,000 characters and collapse extra blank lines for a LinkedIn post.

Social & Creators Social Media Image Size & Safe Zone Cheatsheet Tool Preset pixel sizes and a 5% safe inset for common social placements.

Social & Creators UTM Link Batch Generator & CSV Exporter Build one campaign URL per source line with shared medium, campaign, and lowercase rules.

Social & Creators Short Link Click-Through Rate (CTR) Impact Estimator Clicks and extra clicks from impressions times a current CTR versus a lifted CTR.

Social & Creators Social Media Caption Emoji Cleaner & Extractor Strip emoji from a caption or list the emoji it contains, keeping the text either way.

Social & Creators Email Subject Line Spam Score Checker A simple spam-phrase and punctuation score for a subject line, not a mailbox-provider verdict.

Social & Creators Email Newsletter Read Time & Word Count Estimator Word count and read minutes at a chosen words-per-minute for a newsletter body.

Social & Creators Ad CPM / CPC / CTR Interconvertible Calculator Convert among CPM, CPC, and CTR when any two of the three (or spend and outcomes) are known.

Social & Creators Cost Per Lead (CPL) & Conversion Rate Calculator CPL, conversion rate, and cost per purchase from spend, leads, and sales.

Social & Creators Ad Copy Character Limits Counter (Google, Meta, TikTok) Live counts against headline and primary-text limits for a chosen ad network.

Social & Creators App Store Screenshot Resizer & Device Frame Builder Target screenshot pixels for a chosen store device frame from a source aspect.

Social & Creators Amazon Listing Title & Bullet Point Character Counter Title and bullet lengths versus common Amazon catalog caps.

Social & Creators Amazon Product Keyword Density Analyzer Word frequency in a listing block so you can see which tokens dominate.

Social & Creators Affiliate Marketing Earnings Projection Tool Projected commission from clicks, conversion rate, AOV, and commission percent.

Social & Creators Social Media Handle Availability Format Checker Check whether a handle matches length and character rules for a chosen network. It does not query live availability.

Social & Creators Online Course Pricing & Revenue Estimator Monthly course revenue from price, enrollments, refund rate, and platform take-rate.

Developer & Webmaster JWT Token Generator & Signer Mock Tool Build a header.payload token and optionally HMAC-SHA256 sign it in the browser.

Developer & Webmaster Hash Generator (MD5, SHA-1, SHA-256, SHA-512) Hash text to hex with SHA-1 / SHA-256 / SHA-512 via SubtleCrypto, plus a compact MD5.

Developer & Webmaster HMAC Signature Generator & Validator HMAC-SHA256 hex of a message plus an optional expected-hex match check. Generic HMAC, not webhook-specific.

Developer & Webmaster SSL / TLS Certificate Expiry Calculator Days remaining from notBefore and notAfter dates. Does not decode a certificate file.

Developer & Webmaster DNS Record Parser (Raw Zone Line) Split a pasted zone line into name, TTL, type, and rdata. Does not query live DNS.

Developer & Webmaster IP Subnet & CIDR Calculator (IPv4 / IPv6) IPv4 network, broadcast, host count, and mask from an address and prefix length.

Developer & Webmaster IP Address to Hex / Binary / Integer Converter Convert a dotted IPv4 address to hex, 32-bit binary, and unsigned integer.

Developer & Webmaster Port Number Lookup & Common Services Guide Tool Map a TCP/UDP port to a common service name and IANA range class.

Developer & Webmaster HTTP Header Parser & Format Validator Parse Name: value lines, count fields, and flag lines that lack a colon.

Developer & Webmaster HTTP Status Code Lookup & Response Explainer Reason phrase and class for common HTTP status codes.

Developer & Webmaster User-Agent String Parser & Device Inspector Heuristic browser, OS, and device class from a User-Agent string.

Developer & Webmaster String Escape / Unescape Tool (JS, Python, SQL, HTML) Escape or unescape a string as a JS string literal or HTML entities.

Developer & Webmaster SQL Query Formatter & Indenter Uppercase common SQL keywords and put each on its own line.

Developer & Webmaster Basic SQL INSERT to JSON Converter Turn a simple INSERT or col=val lines into a JSON object. Not a full SQL parser.

Developer & Webmaster JSON to CSV / Excel Converter Flatten a JSON array of objects into a CSV table with a header row.

Developer & Webmaster CSV to JSON Array Converter Parse a header row plus data rows into a JSON array of objects.

Developer & Webmaster XML to JSON Converter Walk XML tags with DOMParser and emit a nested JSON object.

Developer & Webmaster Flat YAML to JSON Converter Convert flat key: value YAML lines into a JSON object. Nested YAML is out of scope.

Developer & Webmaster Basic Markdown to HTML Converter Tiny Markdown subset: headings, bold, emphasis, inline code, and line breaks.

Developer & Webmaster HTACCESS Rewrite Rule Generator Emit a RewriteRule from a from-path, to-path, and optional 301 flag.

Developer & Webmaster Nginx Server Block Configuration Builder Build a listen-80 server block with root, try_files, and optional PHP-FPM.

Developer & Webmaster CSP (Content Security Policy) Header Builder Assemble a Content-Security-Policy header from default-src, script-src, and style-src.

Developer & Webmaster CORS Header Generator Emit Access-Control-Allow-* response headers from origin, methods, and credentials. No network test.

Developer & Webmaster Webhook Payload Signer & HMAC Inspector Sign a webhook-style payload with HMAC for provider examples. Not a generic HMAC playground.

Developer & Webmaster Basic Curl to Fetch Converter Turn a simple curl -X -H -d command into a fetch() call. Not a full curl parser.

Developer & Webmaster Line Set Comparison Inspector Count added and removed lines and list lines that appear in only one side. Not an ordered diff.

Developer & Webmaster Regex Match Highlighter Run a RegExp against a haystack and list match count plus the first 10 hits. No pattern AST diagram.

Developer & Webmaster Keycode / Keyboard Event Code Inspector Show charCode, hex, and a Key* guess from a typed character.

Developer & Webmaster Unix File Permission (Chmod) Octal Calculator Build a chmod octal and rwxr-xr-x symbolic string from owner, group, and other bits.

Developer & Webmaster Git Command Cheat Sheet Builder Common git commands for commit, branch, rebase, stash, or undo tasks.

Developer & Webmaster SemVer (Semantic Versioning) Range Matcher Test whether 1.2.3 satisfies ^, ~, >=, or an exact version range.

Developer & Webmaster Package.json Version Range Cleaner List dependency names and emit JSON with ^ and ~ stripped from versions. Not a dependency tree.

Developer & Webmaster CSS Grid Layout Code Builder Generate grid-template-columns, rows, and gap CSS from column and row counts.

Developer & Webmaster CSS Flexbox Layout Code Generator Build flex-direction, justify-content, align-items, and gap CSS.

Developer & Webmaster CSS Clamp() Responsive Font Calculator Preferred vw slope between two viewports, then a clamp(min, preferred, max) string.

Developer & Webmaster CSS Triangle Code Generator Border-trick triangle CSS from direction, size, and fill color.

Developer & Webmaster CSS Filter Generator (Blur, Sepia, Grayscale) Compose a CSS filter from blur, sepia, and grayscale sliders.

Developer & Webmaster CSS Keyframe Animation Generator Emit @keyframes plus an animation rule that rotates from one angle to another.

Developer & Webmaster SVG Path Visualizer & Optimizer Count path commands, measure string length, and strip extra spaces from a d attribute.

Developer & Webmaster SVG Icon Code Sanitizer & Inline Converter Strip script tags and on* attributes from SVG markup for safer inline use.

Developer & Webmaster HTML Table Code Generator from Text/CSV Turn CSV rows into a <table> with a header row of th cells.

Developer & Webmaster This-Origin Web Storage Inspector List keys from window.localStorage or sessionStorage for this site origin only.

Developer & Webmaster Cookie String Parser & Attribute Visualizer Split a cookie header into names and values, treating flags without = as attributes.

Developer & Webmaster String Byte Length Calculator (ASCII vs UTF-8 vs UTF-16) Count Unicode characters, UTF-8 bytes via TextEncoder, and UTF-16 code units times two.

Developer & Webmaster Random API Key & Secret Token Generator Generate a hex or base64url token from crypto.getRandomValues.

Developer & Webmaster Binary / Decimal / Hexadecimal Interconvertible Calculator Convert a non-negative integer among binary, decimal, and hexadecimal in the browser.

Developer & Webmaster Data Transfer Speed & Download Time Calculator Time to move a file from size and a link speed in Mbps, with overhead you can set.

Developer & Webmaster Bandwidth / Bitrate to File Size Estimator File size from video or audio bitrate and duration, in MB and GiB.

Daily Utilities Reading Time & Speaking Speed Calculator Word count plus read and speak minutes from a passage and two words-per-minute speeds.

Daily Utilities Flesch-Kincaid Readability & Grade Level Analyzer Flesch reading ease and grade level from sentence, word, and vowel-group syllable counts.

Daily Utilities Text Case Inverter & Title Case Converter Invert per-character case, force title case, or alternate letter case on a block of text.

Daily Utilities Slugify / URL String Cleaner Tool Turn a phrase into a lowercase hyphenated URL slug and strip leftover punctuation.

Daily Utilities Alphabetical Text / Line Sorter (Ascending / Descending) Sort non-empty lines A to Z or Z to A with a locale-aware compare.

Daily Utilities Line Break / Newline Remover & Joiner Join wrapped lines into one string with a space or a comma-space separator.

Daily Utilities Whitespace / Extra Space Cleaner Collapse runs of spaces and tabs to one space and trim the edges of the text.

Daily Utilities Word Frequency Counter & Density Inspector Top tokens of three or more letters with counts and percent density in the passage.

Daily Utilities Character Count without Spaces Calculator Count characters with spaces, characters without whitespace, and words in one pass.

Daily Utilities Text Difference / Merge Checker Tool Unique lines in A, unique lines in B, and the common lines shared by both lists.

Daily Utilities Binary to Text & ASCII Converter Convert space-separated 8-bit bytes to text, or text to binary bytes.

Daily Utilities Hex to Text / ASCII Converter Convert a hex string to ASCII text, or text to space-separated hex bytes.

Daily Utilities Morse Code Translator (Text to Morse & Morse to Text) Translate A-Z and 0-9 to ITU Morse, or Morse dots and dashes back to text.

Daily Utilities ROT13 & Cipher Generator Rotate A-Z letters by a chosen shift (13 by default). Digits and punctuation stay put.

Daily Utilities NATO Phonetic Alphabet Translator Spell letters and digits as Alpha, Bravo, Charlie through Zulu and Zero through Nine.

Daily Utilities Random List / Name Picker & Spinner Pick one trimmed line at random using crypto.getRandomValues.

Daily Utilities Random Number Generator with Range & Exclusion Rules Draw unique integers between min and max while skipping a comma-separated exclude list.

Daily Utilities Dice Roller & Probability Distribution Simulator Roll n dice with a chosen face count, show faces and total, plus the theoretical mean.

Daily Utilities Coin Flip Simulator & Head/Tail Frequency Counter Simulate n fair flips and report heads, tails, and each side as a percent.

Daily Utilities Daily Countdown Timer & Event Counter Days and hours from Date.now() until a target calendar date (local midnight).

Daily Utilities Working Days & Business Days Calculator (Excludes Holidays) Count Monday through Friday between two dates, minus optional YYYY-MM-DD holidays.

Daily Utilities Leap Year & Century Calculator Say whether a year is a Gregorian leap year, which century it sits in, and the next leap year.

Daily Utilities Time Duration & Hours Worked Timesheet Calculator Hours worked from start HH:MM, end HH:MM, and unpaid break minutes. Overnight shifts wrap.

Daily Utilities Time Adder / Subtractor (Hours, Minutes, Seconds) Add or subtract two hour-minute-second spans and return the normalized total.

Daily Utilities Military Time (24-Hour) Converter Convert a 12-hour hour and minute plus AM/PM into 24-hour time, or the reverse.

Daily Utilities World Clock & Time Offset Difference Visualizer Show two clocks from Date.now() plus minute offsets from UTC, and the gap between them.

Daily Utilities Pomodoro Timer & Custom Interval Planner Total focus minutes from work, break, and rounds, plus an estimated end clock from now.

Daily Utilities Habit Tracker Streak Calculator Active streak if last done is today or yesterday, plus weekly target pace from Date.now().

Daily Utilities Tip Calculator with Split & Custom Percentage Tip amount, bill plus tip, and per-person share from bill, tip percent, and headcount.

Daily Utilities Gasoline / Fuel Cost & Trip Distance Calculator Gallons and fuel cost from miles, miles per gallon, and price per gallon.

Daily Utilities Electric Vehicle (EV) Charging Time & Cost Estimator Charge hours and wall-energy cost from kWh needed, charger kW, price, and efficiency.

Daily Utilities Electric Bill & Appliance Wattage Cost Calculator kWh and cost from appliance watts, hours per day, days, and the kWh rate.

Daily Utilities Pace Calculator for Running & Cycling (Min/Mile or Min/KM) Pace per unit and speed from distance, elapsed minutes, and mile or kilometer units.

Daily Utilities Target Heart Rate Zone Calculator (Karvonen Method) Karvonen target HR from age, resting heart rate, and intensity percent of heart-rate reserve.

Daily Utilities One Rep Max (1RM) Bench / Squat / Deadlift Calculator Epley one-rep max from the weight you lifted and the reps you completed.

Daily Utilities Body Fat Percentage Estimator (US Navy Method) US Navy tape estimate from sex, height, waist, neck, and hip (women) in inches.

Daily Utilities Ideal Body Weight (IBW) Calculator (Devine / Miller Formulas) Devine and Miller ideal body weight in kilograms and pounds from sex and height in inches.

Daily Utilities Lean Body Mass (LBM) Calculator Lean mass from scale weight and a body-fat percent: weight x (1 - body fat).

Daily Utilities Pregnancy Due Date Calculator (Naegele's Rule) Due date as LMP plus 280 days, plus gestational weeks from Date.now().

Daily Utilities Ovulation & Fertile Window Estimator Ovulation near cycle length minus 14 days from LMP, with a window from 5 days before through the day after.

Daily Utilities Scientific Notation / Exponential Notation Converter Split a number into coefficient and exponent, or rebuild the number from coeff times 10^exp.

Daily Utilities Standard Deviation & Variance Calculator Mean, sample variance, and sample standard deviation from a comma or space list of numbers.

Daily Utilities Z-Score & Normal Distribution Calculator Z-score (x-mean)/sd and an approximate left-tail percentile via an erf expansion.

Daily Utilities Margin of Error & Sample Size Calculator Margin of error from z, p, and n, or the sample size that hits a target margin of error.

Daily Utilities Probability & Combinations / Permutations Calculator nCr or nPr for integer n and r using an iterative product (no full factorial).

Daily Utilities Matrix Addition, Subtraction & Multiplication Calculator Add, subtract, or multiply two 2x2 matrices and print the four result entries.

Daily Utilities Quadratic Equation Solver & Graphing Helper Discriminant and roots for ax^2+bx+c. Complex roots print as text when the discriminant is negative.

Daily Utilities Pythagorean Theorem & Triangle Solver Fill any two of a, b, and hypotenuse c (0 means unknown) and compute the missing side.

Daily Utilities Circle Area, Perimeter, and Arc Length Calculator Area, circumference, and arc length from radius and a central angle in degrees.

Daily Utilities 3D Volume Calculator (Sphere, Cylinder, Cone, Prism) Volume for a sphere, cylinder, cone, or rectangular prism from radius, height, length, and width.

Daily Utilities Speed, Distance & Time Interconvertible Calculator Fill any two of speed, distance, and time (0 means unknown) and solve the third.

Daily Utilities Force, Mass & Acceleration (F=ma) Newton Calculator Fill any two of force, mass, and acceleration (0 means unknown) using F = m a.

Daily Utilities Kinetic & Potential Energy Calculator Kinetic energy 1/2 m v^2 and gravitational potential m g h with g defaulting to 9.81.

Daily Utilities Ohm's Law Calculator (Voltage, Current, Resistance, Power) Fill any two of V, I, and R (0 means unknown), then compute the third plus P = V I.

Daily Utilities Resistor Color Code Band Reader & Calculator Read a 4-band resistor: two digits, multiplier, and tolerance, then ohms and percent tolerance.

Daily Utilities Capacitor Value & Code Converter Decode a 3-digit capacitor code such as 104 into picofarads, nanofarads, and microfarads.

Daily Utilities Sound Decibel & Distance Attenuation Calculator Inverse-square level at a second distance: dB2 = dB1 - 20 log10(d2/d1).

Daily Utilities Torque & Power Conversion Calculator (HP to kW) Shaft power from rpm and newton-meters, or convert horsepower to kilowatts.

Daily Utilities Pressure Unit Converter (PSI, Bar, Pascal, Atm) Convert a pressure value among PSI, bar, pascal, and standard atmospheres.

Daily Utilities Temperature Unit Converter (Celsius, Fahrenheit, Kelvin) Convert a temperature among Celsius, Fahrenheit, and Kelvin.

Daily Utilities Energy Unit Converter (Joules, Calories, kWh, BTU) Convert an energy value among joules, thermochemical calories, kilowatt-hours, and BTU.

Daily Utilities Percentage Increase / Decrease / Difference Calculator Increase percent from A to B, decrease percent from A to B, and symmetric percent difference.

Daily Utilities Ratio & Fraction Simplifier Calculator Greatest-common-divisor simplified A:B ratio plus the decimal value of A/B.

Daily Utilities Greatest Common Divisor (GCD) & Least Common Multiple (LCM) Calculator Euclidean GCD and LCM = |A x B| / GCD for two integers.

Daily Utilities Significant Figures (Sig Figs) Rounding Calculator Round a number to n significant figures and show the matching scientific notation.

Image & Design Color Contrast Ratio Checker (WCAG 2.1 AA / AAA Compliance) Relative luminance contrast between two colors with WCAG 2.1 AA and AAA pass or fail for normal and large text.

Image & Design Color Palette Generator (Monochromatic, Analogous, Triadic) Build a five-swatch hex palette from a base color by rotating HSL hue or stepping lightness.

Image & Design Color Shade & Tint Generator Mix a base hex toward black for five shades and toward white for five tints.

Image & Design HEX to RGB / RGBA Code Converter Turn a hex color plus alpha into rgb() and rgba() CSS, focused on copy-ready declarations.

Image & Design HSL / HSLA to HEX / RGB Converter Convert HSL channels and alpha into hex and rgb/rgba CSS.

Image & Design CMYK to RGB / HEX Print-to-Web Color Converter Convert CMYK percents used in print into sRGB and hex for the web.

Image & Design Color Blindness Visual Simulator (Protanopia, Deuteranopia) Apply a simple linear RGB matrix for protanopia or deuteranopia and show the simulated hex.

Image & Design Hex Sample Mixer (Not Pixel Clustering) Deduplicate pasted hex samples and average them into a mix hex. Does not cluster image pixels.

Image & Design CSS Glassmorphism Code Generator Build backdrop-filter frost glass from blur, fill opacity, and a background color.

Image & Design CSS Neumorphism Code Generator Soft UI from two opposing box-shadows, radius, distance, blur, and a surface color.

Image & Design CSS Border Radius / Blob Shape Builder Eight percentages (horizontal and vertical per corner) compiled into one border-radius blob.

Image & Design CSS Text Shadow Code Generator One text-shadow layer from X, Y, blur, and color.

Image & Design CSS Backdrop Filter Builder Combine blur, saturate, and brightness into one backdrop-filter declaration.

Image & Design CSS Custom Scrollbar Styling Generator WebKit scrollbar width, thumb, and track colors, with an optional Firefox scrollbar-color pair.

Image & Design CSS Loader / Spinner Code Builder A rotating border spinner from size, accent color, and animation seconds.

Image & Design Image Aspect Ratio Crop Calculator (16:9, 4:3, 1:1, 9:16) Largest centered crop box of a chosen ratio that still fits inside a source width and height.

Image & Design Image DPI / PPI Calculator for Printing Print size in inches and centimeters from pixel width, height, and DPI.

Image & Design Image File Size Estimator (JPEG vs PNG vs WebP) Rough byte estimates for raw, JPEG, WebP, and PNG from dimensions, bit depth, and JPEG quality.

Image & Design WebP / AVIF Compatibility Cheatsheet & Preview Short Chrome, Firefox, and Safari support notes for WebP or AVIF so you can plan a picture fallback.

Image & Design Favicon HTML Tag Builder & Manifest Generator Link tags, theme-color, and a tiny web app manifest snippet from a path and theme hex.

Image & Design Typography Scale Calculator (Golden Ratio, Major Third) Six modular type sizes from a base pixel size and a ratio such as 1.25 or 1.618.

Image & Design Responsive Font Size rem/px Interconvertible Calculator Convert a pixel size through a root px into rem, em, and a clamp() suggestion for fluid type.

Image & Design Line Height / Leading Calculator for Typography Unitless line-height plus the matching px and percent values from font size and a 1.2-1.8 ratio.

Image & Design CSS Blur Overlay Generator Emit a CSS filter blur for an overlay box. Optional file is not decoded into a blurred image.

Image & Design CSS Watermark Overlay Snippet A CSS overlay snippet for watermark text with opacity and size. Not a logo file compositor.

Image & Design Photo File Metadata Inspector Show name, byte size, MIME type, and last-modified from a chosen file. Full EXIF tags are not parsed.

Image & Design Text Banner ASCII Art Generator Map A-Z, 0-9, and spaces into a three-row block banner. Does not convert a photo to ASCII.

Image & Design GIF Speed & Frame Interval Calculator Duration and a hundredths-friendly delay from frame count plus either FPS or delay milliseconds.

Image & Design SVG Path Curve / Cubic Bezier Visualizer Cubic Bezier C command and a compact SVG snippet from two control points and an end point.

Image & Design CSS Polygon Clip-Path Generator clip-path: polygon() for triangle, diamond, hexagon, or a custom list of points.