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Developer tools that run entirely in your browser

Format JSON, decode JWTs, test regular expressions, generate hashes, QR codes and more. Free, private, and with no sign up: everything you paste stays on your device.

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Data

CSS Formatter & Minifier Format CSS with clean indentation, or minify it for production. JSON Formatter Format, validate, minify, sort, tree view and convert JSON. JSON to Types Turn a JSON sample into TypeScript, Go or Python types. JSONPath Tester Query a JSON document with a JSONPath expression and see every match. Number Base Converter Convert integers between binary, octal, decimal, hex and more. SQL Formatter Format SQL with clause breaks and keyword casing. User Agent Parser Paste a user agent string and see the browser, OS and device inside it. XML Formatter & Validator Format and validate XML, or minify it for production. YAML Formatter & Converter Format and validate YAML, or convert between YAML and JSON.

Security

AES Encrypt / Decrypt Encrypt text with a password (AES-256-GCM), decrypt it back. Hash Generator MD5, SHA-1, SHA-2 hashes + HMAC, for text and files. JWT Decoder Decode JWT header and payload locally. JWT Signer Sign JSON Web Tokens locally (HS256, HS384, HS512).

Encoding

Base64 Encode and decode Base64 (UTF-8 safe). HTML Entity Encoder & Decoder Encode text to HTML entities, or decode entities back to text. URL Encoder Encode or decode URLs. Edit query params in the breakdown.

Generators

Favicon Generator Make a full favicon set (PNG sizes plus favicon.ico) from an image or text. Password Generator Strong crypto-random passwords, passphrases and PINs. QR Code Generator Turn text or a link into a QR code. Fully offline. UUID & ID Generator Generate UUID v4/v7, ULID and Nano ID values. Validate any ID.

Conversion

Case Converter UPPER, lower, Title, camel, snake, kebab and more. Image Compressor Compress, resize and convert images. PNG, JPEG, WebP. Timestamp Converter Convert Unix time ↔ readable dates.

Color

Color Tools Convert HEX, RGB, HSL, OKLCH. Contrast checker and shades. CSS Gradient Generator Design linear and radial gradients and copy the CSS.

Text

Diff Checker Compare two texts line by line, with word-level highlights. Lorem Ipsum Generate placeholder text in Latin or custom words. Markdown Preview Write Markdown, see the rendered result, copy the HTML. Meta Tag Generator SEO, Open Graph and Twitter meta tags, generated live. Slug Generator Turn titles and headings into clean, URL friendly slugs. Text Utilities Counts, sort lines, dedupe, trim whitespace.

Regex

Regex Tester Test patterns with flags, groups, highlighting and replace.

Reference

chmod Calculator Build Unix permissions: checkboxes, octal and symbolic views. Cron Parser Parse cron expressions into human-readable form. Builder included. HTTP Status Codes Searchable reference for all HTTP status codes. IP Subnet Calculator Network, broadcast, mask and host ranges for any IPv4 subnet.