About DevKit4You
A free, private, browser-based developer tools suite. 12 tools, zero tracking, built for professionals.
// mission
DevKit was built around one principle: tools should just work. No sign-ups. No tracking. No servers seeing your data. No premium tiers blocking basic features.
Every single operation — from decoding Base64 to generating SHA-512 hashes — runs entirely in your browser using native JavaScript APIs. When you close the tab, your data is gone. That's a guarantee, not a policy.
We believe developer tools should be fast, focused, and free. DevKit is all three.
// all 12 tools
Complete Tool Directory
Base64 Decode
Convert Base64 encoded strings back to plain text. Supports per-line decoding and multiple charsets.
Base64 Encode
Encode plain text to Base64 with URL-safe format, MIME chunking, and per-line encoding support.
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes simultaneously using the Web Crypto API.
JSON Formatter
Validate, pretty-print with syntax highlighting, minify, and sort JSON keys. Error reporting with line numbers.
JWT Decoder
Decode and inspect JSON Web Token headers, payloads, and claims. Shows expiry status with remaining time.
URL Encoder / Decoder
Percent-encode or decode URL components using encodeURIComponent or encodeURI, with auto-convert mode.
UUID Generator
Generate cryptographically random UUID v4s in bulk (up to 1000) with multiple output formats.
QR Code Generator
Create QR codes from text or URLs with adjustable error correction. Download as PNG. No third-party APIs.
Text Diff
Compare two text blocks line-by-line using LCS diffing. Additions in green, deletions in red.
Color Converter
Convert between HEX, RGB, and HSL with a live preview swatch and one-click copy for every format.
File Encode / Decode
Upload any binary file to encode to Base64, or decode Base64 back to the original file. Up to 100MB.
Image → Base64
Convert images to Base64 data URIs, CSS backgrounds, or raw Base64 for embedding in code.
// privacy
✓ What we DO
- Process everything in your browser
- Load Google Fonts (cached after first visit)
- Use QR library from Cloudflare CDN
- Serve static files only
✗ What we DON'T
- Collect or store your data
- Run analytics or tracking scripts
- Set cookies of any kind
- Send data to any server
// tech stack
HTML5
CSS3 Custom Properties
Vanilla JavaScript (ES2022)
Web Crypto API
FileReader API
Clipboard API
crypto.randomUUID()
QRCode.js (CDN)
Fira Code (Google Fonts)
Familjen Grotesk (Google Fonts)
Zero frameworks
Zero build steps