100% free No upload Unlimited Instant

Every developer tool you reach for. Free, instant, private.

Format JSON, test regex, decode JWTs, convert YAML, generate hashes, tokens, UUIDs and QR codes — all in one place. Everything runs locally in your browser, so there is no upload, no waiting, and no sign-up. Your code never touches a server.

Format JSON Test a regex

17 tools, no catch

Pick a tool and start instantly. All run in your browser, all run for free.

Format & validate

JSON Formatter & Validator Beautify, minify, validate JSON with a collapsible tree view. Code Formatter & Minifier Pretty-print or minify JS, TS, CSS, HTML, JSON, SQL and more. YAML ⇄ JSON ⇄ TOML Converter Convert config between YAML, JSON and TOML, both ways. JSON Schema Viewer & Validator Render a JSON Schema as a tree and validate data against it.

Preview & render

Markdown Editor (Live Preview) Write Markdown with a live, side-by-side HTML preview. Mermaid Live Editor Turn Mermaid text into flowcharts and diagrams, live. OpenAPI & Swagger Viewer Render an OpenAPI / Swagger spec into a browsable API reference. SVG Viewer & Optimizer Preview, optimize and minify SVG, then copy or download.

Encode & convert

Base64 Encode / Decode Encode and decode Base64 for text and files (URL-safe option). URL Encoder / Decoder Percent-encode and decode URLs and query components. Case Converter Convert between camel, snake, kebab, Pascal and other cases. JWT Decoder Decode a JWT header and payload, check expiry, verify HS256.

Generate & test

Regex Tester Test regex live with match highlights, groups and a cheatsheet. QR Code Generator Generate styled QR codes with shapes, colors and a logo. Random Token Generator Generate secure random tokens and keys with a custom charset. Hash Generator Hash text or files with MD5, SHA-1/256/512 and CRC32. UUID / ULID Generator Generate UUID v4, ULID and NanoID values in bulk.

Built for the way devs actually work.

Most online dev utilities bury the tool under ads, gate it behind a sign-up, or send your payload to a server. We took the opposite path: everything runs on your own device, in a real code editor, with nothing uploaded.

Built by CodingEagles
  • Runs locally — no upload, no round-trip
  • No account or sign-up
  • Your code and data never leave your device
  • No rate limits or paywalls
  • No ads in the editor
  • Free, with no paid tier

Instant, no round-trip

Tools run the moment you type. No upload queue, no API call, no spinner waiting on a server.

Truly private

Your tokens, specs and snippets never leave your device — safe for secrets, internal APIs and unreleased code.

A real editor

Syntax highlighting, line numbers and clear errors — the same feel as your IDE, in a browser tab.