Runs 100% in your browserNo uploads · No account · Free
Tools that work together.Nothing leaves your browser.
77 tools for code, images, documents and data — chained into recipes, run in batches and kept in projects. Everything runs on your device, so nothing you open is uploaded.
- tools
- 77
- recipes
- 13
- library entries
- 281
- lab puzzles
- 87
Inspect anythingPaste text or drop a file — the right tool opens, loaded.
on-deviceor
Drop a fileImages, PDF, Office, CSV, JSON, ZIP — identified from its bytes
RecognisesJSONJWTcronregexCIDRUUIDBase64stack traces+12 more
I need to…
Works offlineLoad a tool, switch off your connection — it keeps working. There is no server to upload to.
No account, no paid tierEvery visitor gets every tool. Your shelf and projects are kept in this browser only.
Desktop-grade enginesWebAssembly runs a real SQL database in the tab — query a 500 MB CSV without sending it anywhere.
Recipes
All 13 recipesJobs that need more than one tool — chained, ready to run on your paste.
- Developer3 stepsClean a JSON API response and type it1Validate JSON2Format JSON3JSON → TypeScriptRun on your paste
- Developer3 stepsTurn a CSV into a typed JSON fixture1Clean hidden characters2CSV → JSON3JSON → TypeScriptRun on your paste
- Developer2 stepsConvert JSON to YAML for a config file1Validate JSON2JSON → YAMLRun on your paste
The toolbox
77 tools, sorted by the job.
- Text EncryptorPassword-protect text with AES-256 encryption, right in your browser.
- Fancy Font GeneratorTurn plain text into 15+ stylish Unicode font variations.
- EXIF Viewer & RemoverInspect photo metadata and strip EXIF/GPS data before sharing.
- Mock Data GeneratorGenerate realistic fake names, emails and rows as JSON or CSV.
- Aspect Ratio CalculatorFind the ratio of any width and height, and resize while keeping it.
- Subnet CalculatorCalculate network, broadcast, host range and split any CIDR block.
- CSV & SQL Data PlaygroundNewOpen CSV files too big for Excel and query them with SQL — no upload.
- Webmaster File GeneratorGenerate robots.txt, sitemap.xml and .htaccess files in seconds.
- Online Diff CheckerCompare two text blocks and highlight every added or removed line.
- Watermark AdderOverlay custom text or a logo onto any image, then download it.
- QR Code GeneratorGenerate scannable QR codes for links, WiFi, contacts, SMS and email.
- Metrics & Unit ConverterConvert length, weight, temperature, volume, speed and more instantly.
- Text Summarizer
- Color Converter
- QR Code Reader
- Fancy Font Generator
- OAuth Flow Simulator
- Case Converter
- SVG Pattern Generator
- Crontab Schedule Creator
- Image Resizer
- Stopwatch & Timer
- QR Code Generator
- SVG Blob & Wave Generator
- Subnet Calculator
- Focus Timer
- Number Base Converter
- MAC Address Analyzer
- Signature Generator
- Slug / URL Encoder
- Hash Generator
- CSS Grid Playground
- Everyday Converters
- JWT Decoder
- Barcode Generator
- Invoice Generator
- Health Calculator
- Text Translator
- Lorem Ipsum Generator
- Flexbox Playground
- CSV & SQL Data PlaygroundNew
- EXIF Viewer & Remover
- JSON to TypeScript
- Invisible Character Detector
- Time-Locked Message
- URL Parser & Query Inspector
- Image Cropper
- CSS Theme Generator
- CSS Gradient Generator
- Text Encryptor
- Batch Workspace
- Image Vectorizer (PNG to SVG)
- Password Generator
- HTML & CSS Playground
- Unix Timestamp Converter
- PDF to Word Converter
- Markdown Previewer
- Image Compressor
- Mock Data Generator
- UI Sound Generator
- Webmaster File Generator
- Word & Character Counter
- Line Sorter & Deduplicator
- UUID & Token Generator
- Metrics & Unit Converter
- Network Protocol Simulator
- On-Screen Ruler
- Watermark Adder
- Base64 Encode / Decode
- Sensitive Data Scanner
- Regex Tester & Builder
- What Is My IP & Network Tester
- Random Picker
- Angle Finder & Protractor
- Meme Generator
- Timezone Converter
- Code Formatter
- Encryption Algorithm Simulator
- Percentage & Finance Calculator
- SVG Optimizer
- Palette Extractor & Contrast Matrix
- Favicon Generator
- Aspect Ratio Calculator
- PDF Toolkit
- Document Privacy Inspector
- Image Redactor
- Age Calculator
- Image to Text (OCR)
- Online Diff Checker
Advanced
Heavyweight work. Still no upload.
The jobs that usually need a desktop install or a server — running entirely on your machine. The engine downloads once, then it is cached.
CSV & SQL Data PlaygroundOpen CSV files too big for Excel and query them with SQL — no upload.NewImage to Text (OCR)Pull the text out of a screenshot, scan or photo — read on your device.Batch WorkspaceDrop up to fifty files, pick one operation and download one ZIP: resize, convert, compress, strip metadata, hash, normalise, rename or inspect.
CSV & SQL Data Playgroundorders.csv · read locally
SELECT region, COUNT(*) AS orders,
ROUND(AVG(total), 2) AS avg_total
FROM 'orders.csv'
GROUP BY region ORDER BY orders DESC;Run queryExample query
regionordersavg_total
EMEA18,40264.10
NA15,97771.35
APAC12,11858.92
3 rowsDuckDB · WebAssembly0 bytes uploaded
Library
281 reference entries you can run, not just read.
Every regex is tested against its own listed matches before release. Every cron line is parsed by the same engine as the tool.
- PatternsRegex, cron and SQL that hold up — each explained, edge-cased and testable in a live tool.86
- SnippetsCopy-paste code that explains itself — JavaScript, Python, bash and CSS you can trust.16
- CommandsCopy-paste CLI recipes that explain themselves — ffmpeg, git, curl, docker and more.20
- PromptsFill-in-the-blank AI prompts for real tasks. Model-agnostic, assembled privately on the page.54
- TemplatesEmails and documents ready to adapt — fill the blanks, copy, and send.38
- FormulasExcel & Sheets formulas with fill-in blanks — set your cells, copy the result.16
- ErrorsPaste an error, get the plain-English meaning, the likely causes ranked, and the fix.16
- ComparisonsThe trade-off that actually decides it — JSON vs YAML, PUT vs POST, SQL vs NoSQL.14
- ChecklistsTick them off as you go — code review, launch, SEO, security. Progress stays on your device.8
- Cheat sheetsReference tables you can filter and print — HTTP codes, Git commands and more.13
Labs
Sharpen up. 87 puzzles, checked by the real engines.
- 28holesRegex GolfWrite the shortest regular expression that matches every string on one list and none on the other. Twenty-eight holes, scored against par, checked in your browser.
- 28puzzlesCron PuzzlesTwenty-eight schedules described in words; write the five-field cron expression that fires at exactly those times, checked by the site's own cron parser.
- 31puzzlesData Wrangling in SQLThirty-one puzzles: small tables in, an exact result set out. Written in SQL, run on DuckDB in your browser, compared cell by cell.
Progress and streaks stay in this browser. No leaderboard, no account.
Privacy by architecture
Why nothing gets uploaded.
Not a policy promise — a design constraint. There is no upload endpoint and no account system, so there is nothing to trust us with.
Read how it is built- 01The code comes to youFiles are read in place, images edited on a canvas, hashing and encryption done with the browser’s own Web Crypto.
- 02Heavy engines run in the tabDatabases and OCR are compiled to WebAssembly. First use downloads the engine once; after that it is cached.
- 03Check it yourselfGo offline mid-task. The few tools that need the network by nature — like finding your IP — say so on the page.