Product line28 tools
Free Online Developer Tools
Essential free utilities built for developers. Format and validate JSON, encode/decode Base64 and URLs, inspect JWT tokens, test regular expressions, minify HTML, CSS, and JavaScript, convert between data formats, and more — all running locally in your browser with zero setup and no data uploads.
FreeNo sign-upRuns in your browser
01JSON FormatterFormat, beautify, and validate JSON data online for free. Instantly prettify minified JSON with syntax highlighting and error detection. No signup required.02Base64 Encoder / DecoderEncode text and files to Base64 or decode Base64 strings online for free. Essential tool for APIs, data URIs, and embedded content. No signup required.03URL Encoder / DecoderEncode and decode URLs and query parameters online for free. Handle special characters, Unicode, and percent-encoding instantly. No signup required.04UUID GeneratorGenerate random UUID v4 identifiers online for free. Create single or bulk UUIDs for databases, APIs, and application development. No signup required.05JWT DecoderDecode and inspect JWT tokens online for free. View header, payload, and signature claims with expiration validation. No signup required.06Regex TesterTest and debug regular expressions online for free with real-time matching and group extraction. Supports JavaScript regex syntax. No signup required.07HTML MinifierMinify HTML code online for free. Remove whitespace, comments, and unnecessary attributes to reduce file size and improve page load speed. No signup required.08CSS MinifierMinify CSS stylesheets online for free. Remove whitespace, comments, and redundant rules to optimize your CSS for production. No signup required.09JavaScript MinifierMinify JavaScript code online for free. Remove whitespace, comments, and shorten variable names to optimize your scripts for production. No signup required.10JSON / CSV ConverterConvert between JSON and CSV formats online for free. Custom delimiters, auto-detection, and nested objects. No signup required.11XML / JSON ConverterConvert between XML and JSON formats online for free. Parse XML to JSON or generate XML from JSON data. No signup required.12YAML / JSON ConverterConvert between YAML and JSON formats online for free. Parse YAML configs to JSON or generate YAML from JSON. No signup required.13CSV ViewerView, search, and analyze CSV files online for free. Get a sortable, filterable table with statistics. No signup required.14Base64 Image Encode / DecodeEncode images to Base64 or decode Base64 to images online for free. Generate data URIs for HTML and CSS. No signup required.15Text Diff CheckerCompare two texts online for free with line-by-line diff highlighting. Spot added and removed lines instantly in your browser. No signup required.16Unix Timestamp ConverterConvert Unix timestamps to human-readable dates and back online for free. Supports seconds and milliseconds, local time and UTC. No signup required.17Number Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal online for free. Instant conversion across all bases at once. No signup required.18HTML Entity Encoder / DecoderEncode and decode HTML entities online for free. Escape special characters for safe markup or unescape entities back to text. No signup required.19Code BeautifierBeautify and format minified HTML, CSS, and JavaScript online for free. Configurable indentation and line wrapping, with automatic language detection. No uploads.20SQL FormatterFormat and beautify SQL queries online for free. Supports MySQL, PostgreSQL, SQL Server, Oracle, BigQuery, Snowflake and more. Runs in your browser — no uploads.21JSON to TypeScriptTurn a JSON sample into TypeScript interfaces, Go structs or Python dataclasses. Detects optional fields across array items. Free, runs in your browser.22XML FormatterFormat or minify XML without losing comments, CDATA or attribute order. Only whitespace changes. Free, runs in your browser.23Cron Expression GeneratorTranslate cron expressions into plain English and preview the next five run times. Presets for common schedules. Free, runs in your browser.24Markdown EditorWrite markdown with a live side-by-side preview. GitHub-flavoured, sanitised rendering, export as .md or standalone HTML. Free, no signup.25Markdown ↔ HTML ConverterConvert HTML to Markdown or Markdown to HTML. ATX headings, fenced code blocks, sanitised output. Free, runs in your browser.26JSON DiffCompare two JSON documents structurally, ignoring key order and formatting. Shows added, removed and changed values by path. Free, no signup.27.gitignore GeneratorBuild a .gitignore from templates for languages, frameworks, editors and operating systems. Deduplicated automatically. Free, runs in your browser.28HEX to RGB ConverterConvert HEX to RGB, RGB to HEX, HSL, HSV, and CMYK instantly. Free online colour converter with alpha support, live preview, and WCAG contrast check. No signup.
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