Free Developer Tools Online
Cron builder, HTML entities, CSS units, chmod, URL parser, gitignore, fake JSON data and more — free browser tools.
Ship faster with everyday builder utilities: cron schedules, permission math, .env cleanup, markdown tables, and mock user JSON.
Everything runs locally — no signup required.
Tools in this collection
Cron Expression Builder
Build and explain 5-field cron schedules with presets.
Regex Tester
Test regular expressions against sample text.
JWT Decoder
Decode JWT header and payload without verifying signatures.
Diff Checker
Compare two texts line by line and highlight changes.
HTML Entity Encoder
Encode or decode HTML entities locally.
CSS Unit Converter
Convert px to rem/em using your root font size.
URL Parser
Break a URL into host, path, hash, and query parameters.
Chmod Calculator
Toggle rwx permissions and get octal chmod values.
HTTP Status Codes
Quick reference for common HTTP response codes.
Gitignore Generator
Combine Node, Next.js, Python, Flutter, and Go .gitignore templates.
.env File Formatter
Trim and sort keys in a .env file for cleaner commits.
Fake Data Generator
Generate mock users with UUID, name, email, and phone as JSON.
Markdown Table Generator
Turn CSV into a GitHub-ready markdown table.
CSS Box Shadow Generator
Design box-shadows with live preview and copyable CSS.
UUID Generator
Generate one or many UUID v4 identifiers.
JSON Formatter
Pretty-print or minify JSON with validation feedback.
HTML5 Video Converter
Export browser & app-ready MP4: H.264, yuv420p, AAC, +faststart streaming.
Video to WebM
Convert to WebM (VP9 + Opus) for modern browsers and smaller web delivery.
Video to GIF
Make palette-optimized GIFs for docs, landing pages, and changelogs.
Video Poster / Thumbnail
Extract a JPG poster frame at any timestamp for HTML5 video or app UI.
Resize Video for Web
Scale videos to 480 / 720 / 1080 / 1280 max width for sites and apps.
HTML5 Video Embed Code
Generate HTML and React <video> snippets with poster, autoplay, and loop options.
FAQ
- Are developer tools private?
- Yes. Inputs stay in your browser. ToolPanda does not upload your code or tokens to process these utilities.
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