150 free web tools

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150 tools

Text & Writing21

🔢 Character CounterCount characters, words & lines 🔠 Case ConverterUPPER / lower & code cases ↔️ Full-width / Half-width ConverterConvert full-width ⇔ half-width 📑 Text DiffCompare two texts ↕️ Line Tools (Sort & Dedupe)Sort, dedupe & trim lines あ Hepburn Romaji Converter (Kana ⇄ Romaji)Hepburn romaji, as used on passports 🔍 SERP Snippet PreviewGoogle-style search preview 📱 Social Post CounterChar limits for X, Bluesky… 🔁 Find & ReplaceReplace text in bulk (regex) 🔣 Fancy Text Generator33 copy-paste unicode fonts 📋 HTML to Plain TextStrip HTML tags to clean text 漢 Kanji Numeral & Daiji ConverterArabic ⇔ kanji ⇔ daiji 👻 Invisible Character RemoverStrip zero-width, BOM & odd spaces 📊 Markdown Table GeneratorCSV/TSV to Markdown tables 🔗 URL & Email ExtractorExtract URLs & emails from text 🔗 URL Slug GeneratorSlugs from Japanese or English 🎵 Mora Counter (Haiku & Tanka)Count mora for haiku and tanka 📈 Keyword Density & Word FrequencyWord counts & density % 🔃 Text Reverser & ROT13Reverse text, lines & ROT13/47 ふ Furigana Ruby Tag GeneratorKanji(kana) → HTML <ruby> tags ▶️ Video Chapter & Description CheckerValidate chapters, title & description

Developer Tools37

{ } JSON FormatterFormat, minify & validate JSON 🔡 Base64 Encode / DecodeText ⇔ Base64 🔗 URL Encode / DecodePercent-encode URLs #️⃣ Hash GeneratorSHA-1 / 256 / 384 / 512 🆔 UUID GeneratorBulk UUID, ULID & NanoID ⏱️ Unix Timestamp ConverterUnix time ⇔ date .* Regex TesterTest regex matches live 🎨 Color ConverterHEX ⇔ RGB ⇔ HSL ⇄ CSV ⇄ JSON ConverterConvert CSV/TSV and JSON </> HTML Escape / UnescapeEscape < > & for HTML 🔑 JWT DecoderDecode header & payload 01 Number Base ConverterBin / Oct / Dec / Hex 🔐 Chmod Calculator755 ⇔ rwx & symbolic 📄 Markdown PreviewWrite Markdown, see HTML ⏰ Cron Expression HelperExplain cron & next runs 🏷️ OGP & Meta Tag GeneratorGenerate og:/twitter: tags ⚖️ JSON Diff ViewerCompare two JSONs 📊 UTM Parameter BuilderBuild tracking URLs 🔃 YAML ⇄ JSON ConverterConvert, format & validate YAML/JSON 🏗️ JSON-LD GeneratorFAQ, Breadcrumb & HowTo structured data 🗃️ SQL FormatterIndent / format / compress SQL 🌐 Subnet CalculatorCIDR → network, range & host count 🔢 TOTP GeneratorOTP codes from a Base32 secret 🧮 File ChecksumFile hash, verify & SRI 🎚️ Color Shade Scale Generator50–950 lightness scale from one color 📈 Cubic Bezier Easing GeneratorCraft CSS easing curves visually 🧩 JSON to TypeScriptGenerate interfaces from JSON 📝 HTML to MarkdownConvert HTML into Markdown 🔤 Character Encoding ConverterFix mojibake, Shift_JIS ⇔ UTF-8 ◐ Color Contrast CheckerWCAG contrast ratio & AA/AAA 🌈 CSS Gradient GeneratorLinear & radial with live preview ▢ Box Shadow GeneratorVisual CSS box-shadow builder 📡 HTTP Status Code ReferenceSearchable status code list 🎨 Color Scheme GeneratorHarmonies from one base color 🌐 Punycode / IDN ConverterIDN ⇔ xn-- (Punycode) 📎 MIME Type ReferenceExtension ⇔ Content-Type lookup 🔳 Border Radius GeneratorRounded corners & blob shapes

Generators20

🔐 Password GeneratorPasswords, passphrases & PINs ▦ QR Code GeneratorURL / text to QR code 📝 Dummy Text GeneratorLorem ipsum & Japanese 🎲 Random Picker & Team SplitterDraw, shuffle & make teams 📶 Wi-Fi QR Code GeneratorScan-to-connect Wi-Fi QR 🛡️ Password Strength CheckerEstimate strength & tips ③ Three-Option PickerSpin to choose 1 of 3 ② Two-Option PickerSpin to decide yes or no 🥇 Random Order PickerFull running order, no repeats 🎯 Roulette (Spin Wheel)Spin to pick one at random 📇 Contact QR CodevCard / MECARD QR codes ▮ Barcode GeneratorCode128 barcodes as PNG 🔐 Encrypted Secret NoteAES-GCM notes in browser 🎱 Bingo Card GeneratorPrintable bingo cards (1–75) 🪜 Amidakuji (Ghost Leg Lottery)Ladder lottery with animation 🏆 Tournament Bracket MakerSingle-elimination brackets 🪑 Seating Chart ShufflerRandom seat assignment grid 🏷️ Name Tags & Checklist PrinterPrintable name tags and checklists 🧪 Test Card Numbers & Dummy DataSandbox card numbers and dummy JSON/CSV 🪧 LED Scrolling BannerGiant scrolling LED message

Calculators & Daily Life37

🍻 Bill SplitterSplit the bill, with tips & rounding 📅 Date CalculatorDays between & age 📏 Unit ConverterLength, weight, temperature… ％ Percentage CalculatorPercent & ratio 🧾 Sales Tax Calculator (Japan)Tax-in / tax-out at 8% / 10% ⚖️ BMI CalculatorBMI from height & weight 📜 Japanese Era Converter & Year TableWestern ⇔ Reiwa/Heisei/Showa + table 🏦 Loan CalculatorMonthly payment & interest 💴 Wage ConverterHourly ⇔ monthly ⇔ yearly 📈 Compound Interest CalculatorFuture value with contributions 🏷️ Discount CalculatorSale price & amount saved ⏱️ Timer & StopwatchCountdown, stopwatch & pomodoro 🌏 World Clock & Time ZonesCurrent times & time-zone convert 🛒 Unit Price Comparison (per gram)Which is cheaper per gram or item 🏠 Tsubo / m² / Tatami ConverterConvert tsubo ⇔ m² ⇔ tatami 📅 Business Days Calculator (Japan)Count days excluding holidays 🎒 Japan School Year Calculator & TableGrade & graduation years, with table 🛍️ Marketplace Fee & Points CalculatorNet payout after fees & points 🍳 Recipe Scaler & Unit ConverterScale servings & cooking units 🤰 Pregnancy Due Date CalculatorDue date & gestational age ▭ Aspect Ratio CalculatorRatio, pixels & CSS aspect-ratio 🏃 Running Pace CalculatorPace, speed, distance & time 🔥 BMR & Calorie CalculatorBMR & TDEE (Mifflin-St Jeor) 🌡️ Heat Index & WBGT EstimatorHeat and humidity indices at once 🚗 Speed, Distance & TimeSolve speed × time × distance 🍚 Rice Cup & Water CalculatorJapanese cups ↔ ml & water 💱 Currency Converter (manual rate)Convert with a rate you enter 📐 Area & Volume CalculatorArea & volume of common shapes 🎎 Shichi-Go-San Year CalculatorWhen to celebrate 7-5-3 🕯️ Memorial Service Date CalculatorBuddhist memorial dates from a date of death 🎌 Japanese Public HolidaysHoliday list & long weekends by year 🌸 24 Solar Terms (Nijūshi Sekki)Dates of Japan's 24 seasonal points 📺 TV & Screen Size Calculator with TableInches ⇔ cm, plus a size table 🎂 Kazoedoshi & Longevity Age CalculatorCounted age, kanreki to hakuju 👶 Baby Milestone Date CalculatorOkuizome, miyamairi and more 🌾 Zassetsu Calendar (Doyō, Higan, Nyūbai)Seasonal markers between the 24 terms 🌙 Kyūreki (Japanese Lunar Date) ConverterGregorian ⇔ Tenpō lunar month

Fortune & Personality5

🎲 Dice, Coin Flip & OmikujiRoll dice, flip a coin, draw a fortune ⛩️ Yakudoshi (Unlucky Age) CalculatorFind your yakudoshi years 🗓️ Rokuyō Calendar (Taian & Butsumetsu)Japan's six-day luck cycle 🌾 Japanese Lucky Days CalendarIchiryū manbai-bi, tensha-nichi and more 🧭 16-Type Personality TestFind your type with 12 or 48 questions

Image & Media19

📐 Image ResizerResize by pixels or percent 🗜️ Image CompressorShrink JPEG / WebP by quality 🔄 Image Format ConverterPNG ⇔ JPEG ⇔ WebP 💾 Image ⇄ Base64Image to Data URI & back 🎞️ Animated GIF MakerCombine images into a GIF 🏷️ Image Metadata Viewer / RemoverView, strip & edit EXIF 🌈 Image Color Palette ExtractorExtract colors from an image ✂️ Image CropCrop images by dragging 🌫️ Image Mosaic & BlurHide faces & private info 👾 Photo to ASCII ArtTurn photos into text art 🎨 Image FiltersGrayscale, sepia, invert & more ⭐ Favicon GeneratorFavicons from image, text or emoji 🖨️ DPI & Print Size CalculatorPixels ↔ cm/inch at DPI 🖼️ Screenshot BeautifierAdd background, padding & shadow 🔄 SVG to PNG ConverterConvert SVG to PNG in browser ↻ Image Rotate & FlipRotate 90° & flip H/V 💧 Image WatermarkAdd text watermarks to images ⬜ Add Padding to Image (Squarify)Extend canvas with margins ✒️ SVG Preview & FormatterPreview, format & minify SVG

PDF Tools11

📄 Images to PDFCombine JPG & PNG into one PDF 🗂️ Merge PDFCombine & reorder PDFs ✂️ Split PDFBy range, per page, or every N 🔄 Rotate PDFTurn pages 90° right/180°/left 🗑️ Delete PDF PagesRemove unwanted pages 🔢 Add Page Numbers to PDFInsert page numbers, styled 💧 Add Watermark to PDFStamp text on every page 🖼️ PDF to Image (JPG & PNG)Pages to JPG/PNG images 📃 Extract Text from PDFCopy or save PDF text 🔀 Reorder PDF PagesRearrange with thumbnails 🏷️ PDF Metadata EditorView, edit or clear PDF properties
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Lightweight tools that load fast and run smoothly on mobile.

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FAQ

Is it really free? Do I need an account?
Yes, completely free, and no sign-up is required.
Is my input data stored?
No. Every tool runs entirely in your browser; your input is never sent to or stored on a server.
Does it work on smartphones?
Yes. It works on phones, tablets and PCs. No installation needed.