Developer Tools

Formatters, encoders, and converters for everyday coding tasks. Everything runs in your browser.

Runs in your browser — nothing uploaded
JSON Formatter & BeautifierFormat, beautify, and validate JSON instantly in your browser. Your data never leaves your device.JWT Decoder & VerifierDecode and verify JSON Web Tokens (JWT) in your browser. HS256, RS256, ES256 supported. Tokens and keys never leave your device.Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text instantly in your browser. Unicode-safe. Nothing is uploaded.URL Encoder & DecoderEncode and decode URLs and query parameters in your browser. Handles full URLs and individual components. Always private.UUID GeneratorGenerate cryptographically random UUIDs (v4) in your browser. Bulk-generate, copy one, or copy all. Nothing leaves your device.Password GeneratorGenerate strong, random passwords in your browser. Choose length, character types, exclude lookalikes. Nothing is sent to any server.Hash Generator (MD5, SHA-256…)Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text in your browser. Verify checksums without leaking the input.Regex TesterTest JavaScript regular expressions in real time. See matches, capture groups, and flags as you type. Pattern and text stay in your browser.HTML MinifierMinify HTML by stripping comments, collapsing whitespace, and tightening tags. Runs entirely in your browser.CSS MinifierMinify CSS by removing comments, whitespace, and trailing semicolons. Fast, private, browser-only.SQL FormatterBeautify SQL queries with consistent indentation and casing. Supports MySQL, PostgreSQL, SQL Server, SQLite, BigQuery, and more. All client-side.Cron Expression ParserTranslate a cron expression into plain English and preview the next runs. Supports standard 5-field cron plus shorthand like @daily and @hourly.CSV ViewerPaste or drop a CSV file and read it as a clean, searchable table. Auto-detects delimiter and headers. Files never leave your browser.JSON ValidatorPaste JSON and find out instantly whether it parses. Pinpointed line and column for syntax errors, structure stats when it's valid. Runs in your browser.JSON MinifierStrip whitespace from JSON for compact transport. See the byte savings and the compression ratio side-by-side. All in your browser.HTML Entity Encoder & DecoderEncode and decode HTML entities — named like & and ©, numeric like €, hex like €. Live preview. All in your browser.Meta Tag Generator (SEO + Open Graph + Twitter)Build the full set of SEO, Open Graph, and Twitter Card meta tags from one form. Live preview of Google, Facebook, and Twitter cards. All client-side.Robots.txt GeneratorBuild a robots.txt file from a simple form. Per-bot allow/disallow rules, crawl-delay, sitemap URL. Validates as you type, copy or download. Always private.IP Subnet Calculator (CIDR)Find the network address, broadcast, netmask, host range, and host count from an IPv4 address and CIDR prefix. Instant and fully client-side.CSS Gradient GeneratorBuild CSS linear and radial gradients with a live preview, unlimited color stops, and one-click copy. Fast, private, and fully client-side.CSS Box Shadow GeneratorDesign CSS box-shadows with a live preview — offset, blur, spread, color, opacity, and inset. Copy the CSS in one click. Runs in your browser.Color Palette GeneratorGenerate color palettes from any base color — complementary, analogous, triadic, monochromatic, and shades. Copy hex codes. All client-side.XML Formatter & BeautifierBeautify, indent, and minify XML in your browser. Validates as you type and reports errors. Your data never leaves your device.JSON to TypeScriptConvert JSON into TypeScript interfaces instantly. Paste a JSON sample and get clean, nested type definitions. Runs entirely in your browser.Random Number GeneratorGenerate random numbers in any range, with or without duplicates. Cryptographically strong, instant, and fully client-side.Fake Data GeneratorGenerate realistic fake data — names, emails, phones, addresses — as JSON or CSV for testing and mockups. Runs entirely in your browser.Color Contrast Checker (WCAG)Check the contrast ratio between text and background colors against WCAG AA and AAA. Live preview and pass/fail grades. Runs in your browser.Random Picker (Name Picker)Paste a list and pick a random winner, or shuffle the whole list. Cryptographically fair, with optional unique draws. Runs entirely in your browser.File Hash & Checksum (MD5, SHA-256…)Get the MD5, SHA-1, SHA-256, SHA-384, and SHA-512 checksum of any file to verify downloads. Files are read in your browser and never uploaded.Text Encrypter & Decrypter (AES-256)Encrypt and decrypt text with a password using AES-256 (Web Crypto). Share secrets safely — it runs in your browser and your key never leaves.Password Strength CheckerCheck how strong a password is — entropy, estimated crack time, and weaknesses. Runs entirely in your browser; nothing is sent or stored.JSON Diff (Compare JSON)Compare two JSON documents and see what changed, ignoring key order and formatting. Added, removed, and changed lines are highlighted. All client-side.Chmod CalculatorConvert Unix file permissions between checkboxes, octal (like 755), and symbolic (rwxr-xr-x). Includes setuid, setgid, and sticky bits. Instant, client-side.HTTP Status Codes ReferenceLook up any HTTP status code — 200, 301, 404, 500, and the rest — with its meaning and when it's used. Searchable, grouped by class, fully client-side.JWT Generator (Sign HS256)Create and sign a JSON Web Token (JWT) with HS256, HS384, or HS512 and your secret — entirely in your browser. Payload, secret, and token never leave your device.ASCII TableA complete ASCII table (0–127) with decimal, hex, octal, binary, the character, and its name. Searchable and fully client-side.CSS Border Radius GeneratorRound element corners visually and copy the CSS border-radius. Tune each corner with a live preview. Runs client-side.JSON to XML ConverterConvert JSON to XML and XML back to JSON in your browser. Two-way, pretty-printed, and your data never leaves your device.User Agent ParserParse any user-agent string into browser, engine, operating system, and device. Detects your own too. Fully client-side.