Developer tools
Format, inspect, convert, and generate the small things that slow down development.
What do you need to do?
JSON formatter & validator
Validate JSON, format it with readable indentation, or minify it for transport.
JSON diff
Compare two JSON values after normalizing their formatting.
YAML ↔ JSON converter
Convert configuration data between YAML and JSON in either direction.
CSV ↔ JSON converter
Convert a header-based CSV table to JSON records or JSON records back to CSV.
Base64 & URL encoder
Encode and decode plain text using Base64 or URL percent-encoding.
UUID generator
Generate one or many cryptographically random version 4 UUIDs.
JWT decoder
Decode a JSON Web Token header and payload into readable JSON.
Regex tester
Test a JavaScript regular expression against sample text with flags and match details.
UTM campaign URL builder
Add consistent source, medium, campaign, term, and content parameters to a URL.
Markdown preview
Write Markdown and see the rendered document update beside it.
Your work stays with you
Selected files and entered text stay private while you use these tools.
Tips for larger files
Very large files can need more memory, especially on a phone. Keep originals, start with a small batch, and close other heavy apps or tabs if a tool feels slow.