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Tools built for developers — formatters, encoders, validators and more
25 tools in Developer
Format, validate and beautify your JSON data instantly
Generate Schema.org JSON-LD structured data for SEO rich results
Encode and decode Base64 strings in real-time
Generate random UUID v4 / GUID values in bulk
Convert Unix epoch seconds/ms to dates and back
Decode JWT header and payload claims in your browser
Encode and decode URL / URI components with percent-encoding
Convert XML documents to JSON
Convert between YAML and JSON
Beautify SQL queries
Pretty-print XML markup
Compare two JSON objects
Build cron schedule expressions
Generate dummy users and emails
Convert Markdown to HTML
Write Markdown and preview HTML side by side free in the browser
Minify HTML to reduce page weight — free online compressor
Compress CSS safely for production — free online CSS minifier
Minify JavaScript for smaller bundles — free online JS compressor
Test regular expressions with live match highlights free online
Validate .env files — find duplicates, empty values, and format issues
Format and beautify GraphQL queries free online
Paste OpenAPI / Swagger JSON and browse paths, methods, and schemas
Parse browser user-agent strings and show your current client details
Detect file MIME type from extension and magic bytes free online