Developer Tools

Encrypt or decrypt text with AES-256-GCM using a passphrase, entirely in your browser via the Web Crypto API.

Encode text to Base64 or decode Base64 back to plain text, instantly, entirely in your browser.

Hash a password with bcrypt at a chosen cost factor, or verify a password against an existing bcrypt hash — entirely in your browser.

Generate a CSS clamp() value that scales font size or spacing smoothly between two viewport widths, with a live preview and size table.

Drag control points to design a CSS cubic-bezier() easing, or turn spring physics into a CSS linear() easing, with a live animation preview.

Minify CSS by removing whitespace and redundancy, entirely in your browser.

Convert CSV to JSON or JSON to CSV, instantly and entirely in your browser, with proper handling of quoted fields, commas, and custom delimiters.

Check the WCAG contrast ratio of text and background colors for AA and AAA, preview the result, and get the nearest passing color. Free, in your browser.

Pick a color and instantly see its HEX, RGB, and HSL values, entirely in your browser.

Build a valid 5-field cron expression from simple dropdowns, with a plain-English description of exactly when it will run.

Paste a 5-field cron expression and get back a plain-English description of exactly when it runs.

Check whether an email address has appeared in a known data breach, with the breach name, date, and what data was exposed.

Remove cookies, auth headers, tokens, and JWTs from a HAR file before sharing it, and view its requests and timings. Runs entirely in your browser.

Escape special characters to HTML entities, or decode HTML entities back to plain text, for safely embedding text in HTML.

Minify HTML by stripping comments and collapsing whitespace, entirely in your browser.

Identify a hash's algorithm from its length and check it against a list of common passwords, entirely in your browser.

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes or HMACs of text or files at once, and verify a checksum. Runs in your browser.

Convert images between PNG, JPEG, and WebP formats, entirely in your browser — no upload required.

Format, minify, and validate JSON online, with error line numbers, key sorting, and big numbers kept exact. Free and runs entirely in your browser.

View JSON as a collapsible tree and search it by key or value. Fast, free, and runs entirely in your browser.

Convert JSON to TypeScript interfaces, a Zod schema, or Go structs, with optional and nullable fields inferred from your data. Runs in your browser.

Convert JSON to YAML or YAML to JSON, instantly and entirely in your browser, with clear error messages when the input isn't valid.

Decode a JWT's header and payload, see readable expiry times, and verify HS, RS, PS, ES, or EdDSA signatures, all locally in your browser.

Create a signed JSON Web Token from a payload and secret using HS256, HS384, or HS512, entirely in your browser.

Convert a number between binary, octal, decimal, and hexadecimal at once — paste one value and see all four bases side by side.

Generate strong random passwords or memorable passphrases, with every chosen character type included, and check any password's strength in your browser.

Free QR code generator for URLs, text, Wi-Fi, contacts and more. Add colors, a logo and a caption, then download PNG or SVG, all in your browser.

Generate a 2048- or 4096-bit RSA key pair in PEM format for signing or encryption, entirely in your browser.

Test a regular expression with live match highlighting, capture groups, and find-and-replace, using JavaScript's own regex engine in your browser.

Format and beautify SQL queries online — proper indentation, clause breaks, and keyword casing, entirely in your browser.

Convert between Unix timestamps and human-readable dates, in UTC and your local timezone, instantly in your browser.

Encode or decode a string or URL for safe use in query strings and URLs, with both component and full-URI encoding modes.

Build campaign tracking URLs with UTM source, medium, campaign, term, and content parameters, entirely in your browser.

Generate random v4 or time-ordered v7 UUIDs in bulk, with hyphen, case, and brace options, and inspect any UUID's version and timestamp.

Get a temporary URL that captures every HTTP request sent to it, including method, headers, query string, and body, to debug webhooks without deploying.

Convert XML to JSON or JSON to XML, instantly and entirely in your browser, with a clear, predictable mapping between attributes, text, and repeated elements.

Convert curl commands to JavaScript fetch, Axios, Python requests, or Go code, including headers, JSON bodies, forms, and auth. Runs in your browser.