100% Client-Side Processing
Developer Tools
Essential developer utilities that run entirely in your browser. No data collection. No sign-ups. No servers.
Available Tools
15 tools ready to use, all processing locally in your browser
JSON to YAML
Convert JSON data to YAML format
YAML to JSON
Convert YAML data to JSON format
JSON Format
Format and validate JSON data
CSV to JSON
Convert CSV data to JSON format
JSON to CSV
Convert JSON array to CSV format
URL Encode/Decode
Encode or decode URL strings
Text Diff Checker
Compare two text blocks and see differences
Lorem Ipsum Generator
Generate placeholder text
Markdown Preview
Preview markdown with live rendering
JavaScript Sandbox
Execute JavaScript code in a sandboxed environment
Escape/Unescape Newlines
Escape or unescape newline characters in text
Base64 Encode/Decode
Encode text to Base64 or decode Base64 strings
JWT Debugger
Decode and verify JSON Web Tokens
Unix Timestamp
Convert between Unix timestamps and dates
String Inspector
Analyze text: character counts, encoding, and word distribution
Why OpenDevTools?
Instant Results
No loading spinners. All processing happens instantly in your browser.
Complete Privacy
Your data never leaves your device. No servers, no tracking, no compromises.
Open Source
Fully transparent. Review the code, contribute features, or fork it.
Frequently Asked Questions
Everything you need to know about OpenDevTools