85 free browser-based developer tools. 100% client-side. No login. No server. No tracking.
- ✅ 100% client-side — your data never leaves the browser
- ✅ No login, no account, no sign-up
- ✅ No tracking. No ads.
- ✅ Dark & light mode
- ✅ Mobile-friendly, 90+ Lighthouse score
- ✅ Source-available — view & learn from the code
- ✅ Fast — vanilla HTML/CSS/JS, no framework bloat
AES Encryption/Decryption, SHA-256/512/1/3, MD5, RIPEMD-160, HMAC, RSA Key Generator, RSA Encrypt/Decrypt, Bcrypt, JWT Builder, TOTP Generator, SSL Certificate Decoder, Password Strength Checker, Hash Comparator, Checksum Generator
Base64 Encoder/Decoder, URL Encoder/Decoder, HTML Entity Encoder/Decoder, Hex Encoder/Decoder, Binary Encoder/Decoder, JSON Formatter, JSON Minifier, JSON Schema Validator
XML↔JSON, JSON↔YAML, CSV→JSON, CSV→Excel, JSON→CSV, Markdown→PDF, Number Base Converter, Decimal↔Hex, DOCX→HTML, JSON→YAML
JWT Decoder/Encoder, UUID Generator, Password Generator, String Generator, Unix Timestamp, Epoch Converter, Cron Builder/Explainer, Regex Tester, Diff Checker, SQL Formatter, Markdown Preview, Lorem Ipsum, HTTP Header Parser, Word Counter, IP Tools, Gzip Tool, ASCII Table, Bit/Byte Calculator, DNS Lookup
QR Generator, Image Resizer, Format Converter, SVG→PNG, PNG↔JPG↔WebP↔HEIC converters, Color Converter, Color Palette Generator, Image Filters & Effects, XML/YAML/HTML/CSS Formatters, JS Minifier
git clone https://github.com/karthickajan/cipherkit.git
cd cipherkit
node build.js
npx serve docs -p 3000
# Open http://localhost:3000- Vanilla HTML, CSS, JavaScript — no framework
- Hosted on GitHub Pages
- Build system:
build.js+tools.jsonfor page generation - Libraries: CryptoJS, JSZip, marked.js, html2canvas, jsPDF, SheetJS
Found a bug or want a new tool? Open an issue — feedback welcome.
Custom Source-Available License — © 2026 Karthick Ajan G S
This software is provided for educational and personal learning purposes only. You may view and study the source code, but hosting, deploying, or redistributing the software is strictly prohibited. See the LICENSE file for full terms.