Free developer tools for every workflow.
Format, convert, validate, generate and experiment in your browser. Every tool is free, and you do not need to create an account.
Data & JSON
6 toolsJSON Formatter & Validator
Beautify, minify and validate JSON instantly, with readable error feedback.
Open tool ↗JSON to CSV Converter
Convert an array of JSON records into spreadsheet-friendly CSV text.
Open tool ↗CSV to JSON Converter
Convert CSV tables with quoted fields into structured JSON objects.
Open tool ↗JSON Minifier
Remove unnecessary whitespace from valid JSON without modifying values.
Open tool ↗XML Formatter
Validate and pretty-print simple XML documents locally.
Open tool ↗XML Validator
Check XML syntax and display a readable validation result.
Open tool ↗Encoding & Security
6 toolsBase64 Encoder & Decoder
Encode readable text into Base64 or decode Base64 strings locally.
Open tool ↗URL Encoder & Decoder
Safely encode query parameter values or decode percent-encoded URLs.
Open tool ↗HTML Entity Encoder & Decoder
Convert HTML special characters to entities or restore them.
Open tool ↗SHA-256 Hash Generator
Calculate a SHA-256 hexadecimal digest using your browser’s Web Crypto API.
Open tool ↗UUID v4 Generator
Generate random version 4 UUID identifiers from your browser.
Open tool ↗Strong Password Generator
Create random passwords using cryptographically secure browser randomness.
Open tool ↗Text & Writing
8 toolsRegular Expression Tester
Test JavaScript regular expressions against text and inspect matches.
Open tool ↗Word & Character Counter
Count words, characters, lines and approximate reading time.
Open tool ↗Text Case Converter
Convert text to uppercase, lowercase, title case or sentence case.
Open tool ↗Text Difference Checker
Compare two texts line by line to locate additions and removals.
Open tool ↗SEO URL Slug Generator
Turn headings into clean, readable URL slugs for web pages.
Open tool ↗Lorem Ipsum Text Generator
Generate sample paragraphs for layouts and content placeholders.
Open tool ↗Duplicate Line Remover
Remove repeated lines while keeping the first occurrence of each.
Open tool ↗Whitespace Cleaner
Trim trailing spaces, normalize line breaks and reduce excess blank lines.
Open tool ↗Web Development
7 toolsCSS Minifier
Compress basic CSS by removing comments and redundant whitespace.
Open tool ↗HTML Beautifier
Indent and format straightforward HTML markup for easier reading.
Open tool ↗HTML Live Preview
Preview HTML, CSS and small JavaScript demos inside an isolated browser frame.
Open tool ↗JavaScript Runner
Run small JavaScript examples in a restricted browser frame and inspect console output.
Open tool ↗Markdown Previewer
Render basic Markdown headings, lists, links and code formatting safely.
Open tool ↗HTML Minifier
Remove HTML comments and compact whitespace between tags.
Open tool ↗HTML Table Generator from CSV
Generate semantic HTML table markup from CSV rows.
Open tool ↗Design & CSS
4 toolsHEX, RGB & HSL Color Converter
Convert color values between common web formats and preview the color.
Open tool ↗CSS Gradient Generator
Build and copy linear gradient CSS with customizable colors and direction.
Open tool ↗PX to REM Converter
Convert between pixels and rem using a configurable root font size.
Open tool ↗CSS Box Shadow Generator
Preview and copy CSS box-shadow declarations.
Open tool ↗Developer Utilities
1 toolsSEO & Metadata
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