Free tools
Free online developer tools & calculators
9 tools
Developer Tools
Everyday utilities for formatting, encoding, and debugging data.
JSON Viewer
Format, validate, and visualize JSON data with syntax highlighting and tree view
JWT Token Parser
Decode and inspect JSON Web Tokens — header, payload, claims, and expiration
URL Encoder/Decoder
Encode and decode URL strings with percent encoding
Base64 Encoder/Decoder
Encode and decode text to/from Base64 format
UUID Generator
Generate UUID v4 (random) and UUID v1 (timestamp-based) instantly
Hash Generator
Calculate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text
QR Code Generator
Create QR codes from text, URLs, emails, phone numbers, and WiFi
Regex Tester
Test regular expressions against sample text, see matches and replace
Markdown Live Preview
Type or paste Markdown and see the rendered result instantly
4 tools
Financial Calculators
Estimate loan payments with full amortization breakdowns.
Mortgage Calculator
Estimate monthly mortgage payments with taxes, insurance, and a full amortization schedule
Car Loan Calculator
Estimate monthly auto loan payments with sales tax, trade-in, and down payment
Compound Interest Calculator
See how your savings or investments grow over time with monthly contributions
Rent vs. Buy Calculator
Compare the long-term financial outcome of renting vs. buying a home
Coming soon
More tools on the way: colour picker, timestamp converter, text comparison and more.
- ✓100% free, no signup or account required
- ✓Runs entirely in your browser. Nothing is sent to a server
- ✓Fast, lightweight, and works offline once loaded