Free Developer Tools
Developer tools for everyday engineering work: format and validate JSON, minify HTML, CSS and JavaScript, encode and decode data, generate UUIDs and hashes, test regular expressions and convert timestamps — fast, offline-capable and free.
JSON Formatter
Pretty-print, minify and validate JSON.
DeveloperUUID Generator
Generate v4 UUIDs in bulk, cryptographically random.
DeveloperBase64 Encoder
Encode text or files to Base64.
DeveloperColor Converter
HEX ⇄ RGB ⇄ HSL with live preview.
DeveloperTimestamp Converter
Unix epoch ↔ human date, both directions.
DeveloperRegex Tester
Test regular expressions with live highlighting.
DeveloperBase64 Decoder
Decode Base64 back to text or files.
DeveloperHash Generator
SHA-256, SHA-1, SHA-512 hashes of text or files.
DeveloperURL Encoder
Percent-encode text for safe URLs.
DeveloperJSON Validator
Validate JSON with exact error locations.
DeveloperMarkdown Preview
Render Markdown to HTML with live preview.
DeveloperURL Decoder
Decode percent-encoded URLs and text.
DeveloperJSON Minifier
Strip whitespace from JSON.
DeveloperHTML Formatter
Indent and beautify HTML markup.
DeveloperJavaScript Formatter
Re-indent and tidy JavaScript code.
DeveloperCSS Formatter
Beautify stylesheets with clean indentation.
DeveloperRGB to HEX
Convert RGB values to HEX codes.
DeveloperHEX to RGB
Convert HEX colors to RGB values.
DeveloperUnix Timestamp Converter
Batch epoch conversion with live clock.
DeveloperJSON to CSV
Convert JSON arrays to CSV spreadsheets.
DeveloperCSS Minifier
Minify CSS and save bytes.
DeveloperHTML Minifier
Compress HTML for production.
DeveloperCSV to JSON
Convert CSV data to JSON arrays.
DeveloperHTML Entity Encoder
Escape HTML special characters.
DeveloperCron Expression Explainer
Explain cron schedules in plain English.
DeveloperRGB to HSL
Convert RGB to HSL color space.
DeveloperHTML Entity Decoder
Convert HTML entities back to characters.
DeveloperQuery String Parser
Parse URL query strings into a table.
DeveloperYAML to JSON
Convert simple YAML to JSON.
DeveloperULID Generator
Sortable unique IDs (ULID format).
Developer