142 free web tools
No sign-up, no install. Everything runs in your browser and your input is never uploaded.
▣ Your input stays on your device No sign-upFreeMobile-ready
Text & WritingTools for writing and editing text 21 Developer ToolsSpeed up everyday engineering tasks 37 GeneratorsGenerate QR codes, passwords and more 16 Calculators & Daily LifeQuick everyday calculations 33 Fortune & PersonalityPersonality quizzes, fortune slips and lucky-day picks for a bit of fun 5 Image & MediaEdit and convert images in your browser 19 PDF ToolsMerge and convert PDFs and images in your browser 11
Recently used
Saved on this devicePOPULAR
Popular tools
Character CounterCount characters, words & lines Fancy Text GeneratorTurn text into stylish unicode JSON FormatterFormat, minify & validate JSON QR Code GeneratorURL / text to QR code Password GeneratorPasswords, passphrases & PINs Bill SplitterSplit the bill, with tips & rounding Sales Tax Calculator (Japan)Tax-in / tax-out at 8% / 10% Image ResizerResize by pixels or percent
ALL TOOLS
All tools
142 tools 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 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 GeneratorTurn text into stylish unicode HTML to Plain TextStrip HTML tags to clean text Kanji Numeral & Daiji ConverterArabic ⇔ kanji ⇔ daiji Invisible Character RemoverStrip zero-width, BOM & odd spaces 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 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 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 Roulette (Spin Wheel)Spin to pick one at random Dice, Coin Flip & OmikujiRoll dice, flip a coin, draw a fortune 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 Yakudoshi (Unlucky Age) CalculatorFind your yakudoshi years Pregnancy Due Date CalculatorDue date & gestational age 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 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 Color Contrast CheckerWCAG contrast ratio & AA/AAA Aspect Ratio CalculatorRatio, pixels & CSS aspect-ratio CSS Gradient GeneratorLinear & radial with live preview Contact QR CodevCard / MECARD QR codes SVG to PNG ConverterConvert SVG to PNG in browser Markdown Table GeneratorCSV/TSV to Markdown tables Barcode GeneratorCode128 barcodes as PNG Image Rotate & FlipRotate 90° & flip H/V URL & Email ExtractorExtract URLs & emails from text Box Shadow GeneratorVisual CSS box-shadow builder URL Slug GeneratorSlugs from Japanese or English HTTP Status Code ReferenceSearchable status code list Image WatermarkAdd text watermarks to images 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 Mora Counter (Haiku & Tanka)Count mora for haiku and tanka Keyword Density & Word FrequencyWord counts & density % Encrypted Secret NoteAES-GCM notes in browser Bingo Card GeneratorPrintable bingo cards (1–75) Color Scheme GeneratorHarmonies from one base color Currency Converter (manual rate)Convert with a rate you enter Area & Volume CalculatorArea & volume of common shapes Text Reverser & ROT13Reverse text, lines & ROT13/47 Furigana Ruby Tag GeneratorKanji(kana) → HTML <ruby> tags Punycode / IDN ConverterIDN ⇔ xn-- (Punycode) MIME Type ReferenceExtension ⇔ Content-Type lookup Video Chapter & Description CheckerValidate chapters, title & description Amidakuji (Ghost Leg Lottery)Ladder lottery with animation Tournament Bracket MakerSingle-elimination brackets Seating Chart ShufflerRandom seat assignment grid Border Radius GeneratorRounded corners & blob shapes Test Card Numbers & Dummy DataSandbox card numbers and dummy JSON/CSV 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 Rokuyō Calendar (Taian & Butsumetsu)Japan's six-day luck cycle Japanese Lucky Days CalendarIchiryū manbai-bi, tensha-nichi and more 24 Solar Terms (Nijūshi Sekki)Dates of Japan's 24 seasonal points 16-Type Personality TestFind your type with 12 or 48 questions TV & Screen Size Calculator with TableInches ⇔ cm, plus a size table Add Padding to Image (Squarify)Extend canvas with margins SVG Preview & FormatterPreview, format & minify SVG LED Scrolling BannerGiant scrolling LED message
No matching tools
Benri.dev — why use it
🆓
All free
Every tool is free — no paywalls or accounts.
🔒
Privacy first
Every tool runs in your browser — your input is never sent to a server. See the privacy policy for analytics and ad cookies.
⚡
Fast & light
Lightweight tools that load fast and run smoothly on mobile.
📱
Use anywhere
No install. Bookmark it and it's always one tap away.
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.