All Tools
Browse 43 free online developer tools grouped by category. All processing happens locally in your browser — your data never leaves your device.
01 JSON Tools
JSON formatting, validation and conversion to other data formats
JSON Formatter
Format / minify / validate JSON — configurable indent, precise error location, one-click copy
→
JSON ⇄ XML
Two-way conversion between JSON and XML
→
JSON ⇄ YAML
Two-way conversion between JSON and YAML
→
JSON ⇄ CSV
Two-way conversion between JSON arrays and CSV
→
JSON → TypeScript
Generate TypeScript interface / type declarations from JSON
→
JSON → Java POJO
Generate Java entity classes from JSON · Lombok / Jackson annotations supported
→
JSON → C# Class
Generate C# entity classes from JSON · Newtonsoft.Json annotations supported
→
JSON → C++ Struct
Generate C++ structs from JSON (STL: std::string / std::vector)
→
JSON → Go Struct
Generate Go structs from JSON · json tags added automatically
→
JSON → Python Dataclass
Generate Python @dataclass types from JSON (typing supported)
→
JSON → JavaScript Class
Generate ES6 classes from JSON · with JSDoc type comments
→
02 Code Formatters
Beautify and minify code in common languages
03 Encoding / Decoding
URL / Base64 / JWT / Unicode / Hex codec
URL Encode / Decode
URL encoding and decoding
→
Base64 Encode / Decode
General Base64 codec for text and Data URIs (UTF-8)
→
JWT Decoder
Decode JWT tokens · Header / Payload / Signature
→
Unicode Converter
Convert between characters and \u escape sequences
→
Hex ⇄ String
Convert between hexadecimal and strings (UTF-8)
→
04 Hash / Crypto
Common digest algorithms
05 Time Tools
Timestamp / Cron / Timezone / Date format
Unix Timestamp Converter
Timestamp ⇄ local date · seconds / milliseconds
→
Cron Expression Parser
Human-readable parsing of cron expressions · supports Chinese / English
→
Time Zone Converter
Show synchronized time across multiple time zones
→
Date Format Converter
Convert between date formats · several common patterns
→
06 Tabular Data
CSV / TSV / Excel conversion
CSV ⇄ XML
Two-way conversion between CSV and XML
→
CSV Cleaner / Formatter
Remove columns · delete empty rows · deduplicate · trim whitespace
→
Excel → CSV
Paste Excel cells (TSV) and convert to CSV automatically
→
TSV ⇄ CSV
Convert between tab-separated and comma-separated values
→
Text → Table
Turn plain text into a Markdown or ASCII table quickly
→
07 Text Tools
Case / line breaks / sort / MD / escape / count
Text Case Converter
11 formats: upper / lower / camel / kebab / snake and more
→
Line Break Converter
Convert line endings: LF (Unix) / CRLF (Windows) / CR (Old Mac)
→
Text Cleaner
Remove extra spaces / blank lines / line breaks
→
Text Sort / Unique
Sort, deduplicate and shuffle lines
→
Markdown ⇄ HTML
Two-way conversion between Markdown and HTML
→
HTML Escape / Unescape
Escape and unescape HTML special characters
→
Word Counter
Count characters / words / lines / paragraphs / Chinese characters
→
Text Diff
Compare two texts or files side by side, highlight added / removed lines
→
08 Database Tools
DDL / entity class bidirectional conversion
09 Color / Style
Color format conversion and image Base64