Developer tools

JSON, regex, hashes, JWT, diffs, encoders, and other tools devs reach for daily.

• JSON Formatter Format, validate, and minify JSON in your browser. Tree view with copyable paths. Nothing is uploaded to a server.
• Base64 Encoder & Decoder Encode and decode Base64 text and files in your browser. Image preview included. No data leaves your device.
• URL Encoder & Decoder Encode and decode URLs and URL components in your browser. Supports component-level and full URL modes.
• JWT Decoder Decode JSON Web Tokens (JWT) and verify signatures in your browser using the Web Crypto API. Nothing is sent to a server.
• Hash Generator Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text or files in your browser using the Web Crypto API.
• UUID Generator Generate UUIDs in v1, v4, and v7 formats. Bulk generate and download as CSV. Runs entirely in your browser.
• Regex Tester Test regular expressions in your browser. View match groups, run replace operations, and reference the built-in cheat sheet.
• Cron Parser Parse cron expressions into plain English and preview the next 10 run times. Generate cron strings from a form.
• Unix Timestamp Converter Convert Unix timestamps (epoch) to human-readable dates and ISO 8601, in any timezone. Runs in your browser.
• SQL Formatter Format and beautify SQL queries in your browser. Supports MySQL and PostgreSQL dialects.
• Diff Checker Compare two blocks of text side-by-side or inline. Highlights additions, removals, and changes. Runs in your browser.
• CIDR & Subnet Calculator Calculate IPv4 subnet ranges, network/broadcast addresses, usable host counts, and CIDR notation. Runs in your browser.
• Markdown to HTML Convert Markdown to clean HTML in your browser with live preview. Copy as HTML or download.