About FreeDevKit
Free online developer utilities that respect your privacy. Every operation runs in your browser — your data never leaves your device.
47
Dev Tools
Yes
100% Free
0
Sign-ups Required
0
Data Sent to Server
Our Tools
JSON Formatter
Format, minify, and validate JSON with configurable indentation.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text with full Unicode support.
URL Encoder/Decoder
Encode special characters for URLs or decode percent-encoded strings.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, signature, and expiry.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes. Compare hashes for integrity.
Regex Tester
Test regex patterns with real-time highlighting and a common patterns library.
Diff Checker
Compare two texts side by side with color-coded line-by-line differences.
Cron Generator
Build cron expressions visually with explanations and next run time preview.
CSS Gradient
Build linear, radial, and conic gradients with live preview.
Box Shadow
Design box shadows with offset, blur, spread, and color controls.
Border Radius
Control individual corner radii with live preview.
Flexbox Builder
Build flexbox layouts interactively.
Grid Builder
Create CSS Grid layouts with visual preview.
Animation Builder
Design CSS keyframe animations with live preview.
Test Generator
Generate unit test cases for JavaScript, Python, and Java.
Notepad
Distraction-free text editor with auto-save and export.
Markdown Editor
Write markdown with live split preview and toolbar.
Table Generator
Build tables visually, export as HTML, Markdown, CSV, JSON, LaTeX.
API Tester
Test REST APIs with headers, auth, history, and code snippets.
Fake Data Generator
Generate realistic fake data as JSON, CSV, or SQL.
Privacy & Security
100% Browser-Based
All processing happens in your browser. Your data is never uploaded to any server.
Instant Processing
No waiting for server responses. Everything is processed instantly using JavaScript.
Works Everywhere
Use on any device with a modern browser — desktop, tablet, or phone. No installation needed.