Free online tools

No signup, no ads, nothing uploaded to a server. Pick a tool below — each one opens instantly and does exactly what it says. Curated lists: for developers · for students.

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Text tools

Word CounterWords, characters, sentences, reading time Case ConverterUPPER, lower, Title, camelCase, snake_case Text Diff CheckerCompare two blocks of text line by line Duplicate Line RemoverDedupe, trim, and sort a list of lines Whitespace & Text CleanerStrip extra spaces, blank lines, tabs Lorem Ipsum GeneratorPlaceholder text by paragraph, sentence, or word Palindrome & Anagram CheckerCheck words and phrases instantly Slug GeneratorTurn any title into a clean URL slug Readability Score CheckerFlesch-Kincaid grade level Social Media Character CounterX, Instagram, TikTok, LinkedIn limits Text to SpeechRead aloud with your browser's voices Word Frequency CounterMost-used words, ranked, stopwords optional

Calculators

Mortgage CalculatorMonthly payment, total interest, total cost Loan Payoff CalculatorTime & interest saved by overpaying Compound Interest CalculatorSavings growth, yearly breakdown Simple Interest CalculatorNo compounding, quick estimate Savings Goal CalculatorHow much to save monthly for a target FIRE CalculatorYour number to retire, years to reach it Percentage CalculatorThree common percentage calculations Tip CalculatorSplit the bill, pick a tip percentage Overtime Pay CalculatorRegular + overtime pay by the week BMI CalculatorMetric or imperial, standard WHO ranges Discount CalculatorSale price and savings from a % off Markup & Margin CalculatorSelling price from cost and markup Break-Even CalculatorUnits needed to cover fixed costs Age CalculatorExact age, or time between two dates Date CalculatorDays between dates, or add/subtract days GPA CalculatorStandard 4.0 scale, add courses freely Weighted Grade CalculatorFinal grade from weighted categories Unit ConverterLength, weight, and temperature Currency ConverterLive daily exchange rates Recipe Measurement ConverterCups, tbsp, tsp, ml, grams Recipe ScalerScale any ingredient list to new servings VAT & Sales Tax CalculatorAdd or remove tax from a price Net Worth CalculatorAssets minus liabilities, private Grade Needed CalculatorScore needed on a final to hit your target TDEE & Calorie CalculatorBMR, maintenance calories, cut/bulk targets

Generators

QR Code GeneratorAny text or link, downloadable PNG Barcode GeneratorCode128, EAN-13, UPC Password GeneratorCryptographically random, adjustable UUID GeneratorRandom UUID v4, one or in bulk Random Number GeneratorAny range, with or without duplicates Random Name PickerPick names for raffles or teams Wheel SpinnerAnimated spin-to-pick wheel Dice Roller & Coin Flipd4 to d100, fair and instant CSS Gradient GeneratorVisual linear/radial gradient builder Countdown TimerCount down to any date and time Invoice GeneratorFill in, print, or save as PDF Resume BuilderPrint or save as PDF, no watermark Meme GeneratorTop/bottom text, no watermark Fibonacci Sequence GeneratorExact BigInt values, any length

Developer tools

JSON FormatterFormat, validate, and minify JSON Base64 Encode/DecodeText to Base64 and back URL Encoder/DecoderURL-encode or decode any string HTML Entity EncoderEscape and unescape HTML entities Hash GeneratorSHA-1, SHA-256, SHA-384, SHA-512 Regex TesterLive match highlighting, JS flavor Unix Timestamp ConverterEpoch seconds to date and back Binary / Hex / Decimal ConverterAll four common number bases live Markdown PreviewerLive-rendered side by side Color ConverterHEX, RGB, and HSL, with a picker .gitignore GeneratorNode, Python, Java, Go, Rust & more Favicon GeneratorEvery standard size, no upload Credit Card Validator (Luhn)Checksum + network detection IBAN ValidatorMOD-97 checksum check Prime Number CheckerCheck or list primes up to a limit SEO Title & Meta CheckerGoogle truncation limits, live preview Social Share PreviewSee link cards before you post Screen Resolution CheckerViewport, DPR, browser info Password Strength CheckerEntropy, crack time, nothing sent JWT DecoderHeader + payload, expiry check, nothing sent Cron Expression ExplainerPlain English + next 5 run times cURL Command BuilderMethod, headers, body → ready command Subnet CalculatorIPv4 CIDR → network, broadcast, host range CSV ↔ JSON ConverterPaste one, get the other, both ways What Is My IP Address?Public IP + browser/OS/timezone info DNS LookupA, AAAA, MX, TXT, CNAME, NS records Color Contrast CheckerWCAG AA/AAA pass/fail, live preview YAML ↔ JSON ConverterPaste one, get the other, both ways Markdown Table GeneratorPaste CSV/TSV, get a ready Markdown table HTTP Status Codes ReferenceSearchable, plain-English meanings Chmod Calculatorrwx matrix → octal and symbolic JSON to TypeScript ConverterGenerates interfaces, handles nesting JSON Diff CheckerStructural comparison, not line-by-line JWT EncoderReal HMAC-SHA256 signing via Web Crypto robots.txt GeneratorAllow/disallow rules, sitemap reference Sitemap.xml GeneratorPaste URLs, set changefreq and priority Open Source License GeneratorMIT, Apache 2.0, GPL 3.0 & more, verbatim ULID GeneratorSortable unique IDs, timestamp-prefixed Query String Builder & ParserBuild or parse URL params, both directions Base32 Encoder/DecoderRFC 4648 standard alphabet Conventional Commit BuilderType, scope, breaking change footer Image to Base64 EncoderData URI for CSS/HTML embedding HTML MinifierSafe whitespace/comment stripping CSS MinifierSafe whitespace/comment stripping Passphrase GeneratorDiceware-style, cryptographically random

On-device AI

Face Blur ToolAI face detection blurs photos or live webcam, on-device AI Background RemoverCuts out the background with a ~7MB on-device model Speech to Text TranscriberOn-device Whisper AI — record or upload, nothing sent anywhere

File & privacy tools

Merge PDF FilesCombine and reorder PDFs, nothing uploaded EXIF Metadata RemoverStrip GPS, camera model, timestamps Image Format ConverterPNG, JPG, WebP — batch, adjustable quality Image CompressorShrink JPG/PNG/WebP, no upload

Productivity

To-Do ListSaves automatically in your browser Habit TrackerWeekly grid, saves locally Flashcard MakerMake cards, study in quiz mode Pomodoro TimerFocus sessions with breaks Online StopwatchStart, stop, and record laps World ClockLive time in cities worldwide Time Zone ConverterConvert a specific time between zones

Fun & miscellaneous

Morse Code TranslatorText to Morse, with audio playback Caesar Cipher & ROT13Classic letter-shift ciphers Roman Numeral ConverterNumbers to numerals and back Emoji PickerSearch and copy emoji instantly Image CompressorShrink JPG/PNG/WebP, no upload YouTube Thumbnail DownloaderEvery resolution, straight from YouTube's CDN

Game night

Dice Roller & Coin Flipd4 to d100, fair and instant Virtual Card DeckShuffled 52-card deck, draw without repeats Wheel SpinnerAnimated spin-to-pick wheel Random Name PickerPick names for raffles or teams Team RandomizerSplit a name list into balanced random teams Tournament Bracket GeneratorRandomized single-elimination bracket, byes handled Score TrackerMultiplayer scoreboard, saves as you play Turn TimerChess-clock style per-turn countdown Fantasy Name GeneratorD&D character names by race Charades & Pictionary WordsPick a category, reveal one word at a time Bingo Card GeneratorClassic numbers or custom words, printable RPG HP & Initiative TrackerD&D combat tracker, damage/heal, saves locally Poker Chip CalculatorChip breakdown per player for any buy-in Quiz BuzzerFirst-to-buzz for trivia night, tap or press a key

Trading card & video games

Life CounterMagic: The Gathering / Commander life tracker Yu-Gi-Oh LP Counter8000/4000/16000 presets, coin toss, dice roll WoW Classic DKP TrackerGuild loot point ledger, CSV export, saves locally WoW Classic Loot Roll TrackerRoll 1-100 for every player, ranked instantly WoW Classic AH Flip CalculatorReal profit after the 5%/15% auction house cut CPS TestClicks-per-second speed test, tracks your best Reaction Time TestVisual reaction time in milliseconds, 5 rounds Minecraft Coordinate CalculatorOverworld ↔ Nether conversion, both directions Dice Pool RollerSuccess-counting dice for World of Darkness, Shadowrun Chess Elo CalculatorStandard formula, selectable K-factor D&D 5e Encounter CalculatorOfficial DMG XP thresholds & multiplier

Work tools

Meeting Cost CalculatorWhat a meeting really costs, live counter Overtime Pay CalculatorRegular + overtime pay by the week Invoice GeneratorFill in, print, or save as PDF Resume BuilderPrint or save as PDF, no watermark Pomodoro TimerFocus sessions with breaks

Art & design

Color Palette GeneratorRandom, complementary, analogous, triadic Color ConverterHEX, RGB, and HSL, with a picker Color Contrast CheckerWCAG AA/AAA pass/fail, live preview CSS Gradient GeneratorVisual linear/radial gradient builder Favicon GeneratorEvery standard size, no upload CSS Box Shadow GeneratorVisual builder, inset support CSS Border Radius GeneratorPer-corner control, organic blob shapes Code to ImageShareable code screenshots, no signup ASCII Art Text GeneratorBig block-letter banners for any text

Interior & home

Paint CalculatorHow much paint a room needs, metric or imperial Room Layout PlannerDrag furniture to scale, rotate, see what fits Color Palette From a PhotoExtract dominant colors for matching decor

Music & hobbies

Online MetronomeAdjustable BPM, tap tempo, accented beats Morse Code TranslatorText to Morse, with audio playback

Also from this workshop

Trades Website Pack5 ready-to-edit small-business sites — $29 Offline ToolboxAll 106 tools, zero telemetry, works air-gapped — $29