Free Online Developer Tools
Essential utilities for developers — JSON formatting, Base64 encoding, hash generation, regex testing, JWT decoding, UUID generation, and much more. Everything runs locally in your browser. No server, no data leaks, no sign-up.
Encoding & Decoding
Encode and decode Base64 strings, images, and binary data.
Format & Transform
Format, validate, and transform data between representations.
Timestamp Converter
Convert Unix timestamps to dates
Use tool →String Escaper
Escape strings for various formats
Use tool →JSON Formatter
Format and beautify JSON data
Use tool →ASCII Converter
Convert text to ASCII codes
Use tool →Bulk File Renamer
Rename multiple files with patterns
Use tool →Code Minifier
Minify CSS, JavaScript, and HTML
Use tool →Analyze & Inspect
Decode, test, and understand tokens, expressions, and syntax.
Generate & Create
Create tokens, hashes, UUIDs, commands, and other assets.
JWT Generator
Generate JWT tokens
Use tool →cURL Command Builder
Build and test cURL commands
Use tool →Bcrypt Hash Generator
Generate and verify bcrypt hashes
Use tool →Favicon Generator
Generate favicons from images
Use tool →UUID Generator
Generate random UUIDs/GUIDs
Use tool →Hash Generator
Generate MD5, SHA-1, SHA-256 hashes
Use tool →Color & Design
Pick colors, build gradients, and extract palettes from images.
Why Use FlexKit Tools Developer Tools?
Your data never leaves your machine
All operations run in your browser — no API calls, no telemetry, no logs. Paste sensitive tokens or data without worry.
Fast and always available
No backend to go down. Tools load instantly and work offline after the first visit.
No account or installation needed
Bookmark a URL and use the tool immediately — nothing to install, no email required.
Purpose-built for developer workflows
Each tool is designed around real tasks: debugging JWTs, formatting API responses, building cURL commands, and more.
Frequently Asked Questions
Is it safe to paste JWT tokens or passwords here?
Yes. All processing happens locally in your browser using JavaScript. Nothing is transmitted to a server — your sensitive data stays on your device.
Which hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-256, and SHA-512. The Bcrypt Generator supports bcrypt hashing and verification.
Can I use these tools offline?
After the initial page load, most tools work without an internet connection since all logic runs client-side.
How do I decode a JWT token?
Use the JWT Decoder tool — paste your token and it instantly displays the header, payload, and expiration information without requiring the signing secret.