Free Online Developer Tools
Format, validate, convert, encode, and debug — all in your browser. Zero server uploads. 100% private.
JSON Formatter & Validator
Prettify, validate, and minify JSON data with syntax check.
JSON to CSV Converter
Convert JSON array data into downloadable CSV files.
HTML Entity Encoder/Decoder
Encode & decode special characters to HTML entities.
URL Encoder/Decoder
Percent-encode query parameters and decode URL strings.
Base64 Encoder/Decoder
Convert text or files to Base64 strings & decode back.
Regex Tester
Test regular expressions with real-time match highlighting.
XML Formatter
Beautify, indent, and minify XML and SVG code.
CSS Minifier
Compress CSS stylesheets and eliminate redundant bytes.
CSV & TSV Viewer
Open, sort, filter, and edit CSV and TSV spreadsheets with JSON/MD export.
YAML Formatter & Validator
Format, validate, and convert YAML to JSON or JSON to YAML with templates.
Markdown Live Previewer
Live GitHub Flavored Markdown (GFM) editor with split view and HTML export.
Unix Timestamp Converter
Convert epoch timestamps to UTC/local dates with live ticking clock.
UUID / GUID Generator
Generate cryptographically secure UUID v4, v1, and NanoIDs in bulk.
URL Parser & Query Studio
Deconstruct URLs into components, edit parameters, and strip tracking tags.