Developer Tools
Browse free, browser-based Developer Tools. Use them instantly with no account.
Base64 Encoder and Decoder
Encode Unicode text as Base64 or decode Base64 back to text.
Developer ToolsCron Expression Builder
Build standard five-field cron expressions with useful presets.
Developer ToolsCSS Border-Radius Generator
Adjust four corner radii and copy the CSS.
Developer ToolsCSS Box-Shadow Generator
Build and preview a CSS box-shadow declaration.
Developer ToolsCSS Clamp Calculator
Generate a fluid CSS clamp value between two viewport sizes.
Developer ToolsCSS Grid Generator
Preview a column layout and generate copy-ready CSS Grid code.
Developer ToolsCSV and JSON Converter
Convert tabular CSV data to JSON and JSON arrays back to CSV.
Developer ToolsCSV Viewer and Editor
View and edit CSV data as a browser-based table.
Developer ToolsHash Generator
Generate SHA-1, SHA-256, SHA-384, or SHA-512 hashes from text.
Developer ToolsHTML Entity Encoder and Decoder
Encode HTML-sensitive characters or decode HTML entities.
Developer ToolsHTML Table Generator
Edit a browser table and generate its semantic HTML markup.
Developer ToolsJSON Formatter and Validator
Validate, format, or minify JSON directly in your browser.
Developer ToolsJWT Decoder
Decode JSON Web Token headers and payloads without uploading the token.
Developer ToolsMarkdown Editor and Preview
Write Markdown and see a safe live HTML preview.
Developer ToolsNumber Base Converter
Convert whole numbers between bases 2 and 36.
Developer ToolsPassword Generator
Generate strong random passwords with configurable character sets.
Developer ToolsQuery String Parser and Builder
Inspect, edit, and rebuild URL query parameters.
Developer ToolsRegular Expression Tester
Test JavaScript regular expressions and inspect every match.
Developer ToolsText Difference Checker
Compare two texts and highlight changed, added, and removed lines.
Developer ToolsUnicode Character Inspector
Inspect characters, code points, UTF-16 units, and HTML entities.
Developer ToolsUnix Timestamp Converter
Convert Unix timestamps to readable dates and dates back to timestamps.
Developer ToolsURL Encoder and Decoder
Encode text for URL components or decode percent-encoded values.
Developer ToolsUUID Generator
Generate one or many random version 4 UUIDs.
Developer ToolsXML Formatter and Validator
Check well-formed XML, format it, or create a minified copy.