Developer Tools
Formatters, encoders, generators and validators that run offline in your browser.
56 free tools that run directly in your browser. No file uploads, no signup, no watermarks.
Format & Validate
JSON FormatterTurn unreadable JSON into properly indented, readable structure.JSON BeautifierExpand minified JSON into something a human can actually read.JSON MinifierStrip every unnecessary byte from your JSON.JSON ValidatorCheck whether your JSON is valid, and find out exactly why it is not.HTML FormatterClean up messy HTML markup.CSS FormatterFormat CSS into a consistent, readable style.JavaScript FormatterFormat JavaScript to a clean, consistent style.SQL FormatterMake long SQL queries readable.XML FormatterIndent and check XML documents.YAML FormatterFormat, validate and convert YAML.
Convert
CSV to JSONTurn spreadsheet exports into JSON your code can use.JSON to CSVGet JSON into a spreadsheet.JSON to YAMLMove config between the two formats everything uses.JSON to TypeScriptGenerate types from a real API response.XML to JSONGet XML into a shape JavaScript can work with.Markdown to HTMLTurn Markdown into HTML you can paste anywhere.Number Base ConverterBinary, octal, decimal, hex and everything between.Timestamp ConverterConvert between Unix timestamps and readable dates.
Encode & Decode
Base64 EncoderEncode text as Base64.Base64 DecoderDecode Base64 back into readable text.URL EncoderPercent-encode text so it survives inside a URL.URL DecoderTurn percent-encoded URLs back into readable text.URL ShortenerCreate short, clean links for sharing on social media or email.Hash GeneratorGenerate cryptographic hashes from any text.JWT DecoderRead what is inside a JSON Web Token.
Generate
UUID GeneratorGenerate cryptographically random UUIDs.Password GeneratorGenerate strong, genuinely random passwords.QR Code GeneratorMake a QR code that will still work in five years — or set it to expire on purpose.Lorem Ipsum GeneratorGenerate placeholder text for layouts and mockups.Slug GeneratorTurn a title into a clean, readable URL.
Text
Text DiffSee exactly what changed between two versions.Case ConverterSwitch between naming conventions instantly.Word CounterCounts, reading time and the words you lean on most.Regex TesterTest a regular expression against real text.Colour ConverterConvert between every colour notation CSS understands.
More tools
JSON DiffCompare two JSON documents and see exact property differences.HTML Entity Encoder / DecoderEncode special characters into HTML entities or decode entities to plain text.CSS MinifierCompress CSS styles to reduce file size and increase page speed.HTML MinifierCompress HTML documents to reduce download size.JavaScript MinifierMinify JS code to optimize script payload size.Base64URL Encoder / DecoderConvert text to URL-safe Base64URL strings or decode them back.URL Query Parameter ParserInspect and parse query string parameters from any URL.Cron Expression Parser & Next Run CalculatorDecode cron schedules into human-readable text and calculate next execution times.JWT GeneratorCreate local JWT test tokens with custom headers and payloads.User-Agent ParserAnalyze User-Agent strings to extract browser and OS information.HTTP Status Code LookupSearch and inspect HTTP response status codes and RFC definitions.CSS Box Shadow GeneratorCreate custom CSS box shadows with live code output.CSS Gradient GeneratorDesign linear and radial CSS background gradients.YAML to JSON ConverterConvert YAML configurations and data structures into JSON format.JSON Schema ValidatorValidate JSON payloads against JSON Schema specifications.JSON to XML ConverterConvert JSON data structures into formatted XML elements.XML to YAML ConverterConvert XML documents into readable YAML configuration syntax.SQL MinifierMinify SQL queries by removing unnecessary whitespace and comments.SQL BeautifierFormat and beautify raw SQL queries for clear readability.SHA-256 Hash GeneratorCalculate 256-bit cryptographic SHA-256 checksum digests.SHA-512 Hash GeneratorCalculate 512-bit cryptographic SHA-512 checksum digests.
Frequently Asked Questions
Yes. All 56 developer tools execute locally in your web browser. Your data and files are never uploaded to any server.
No software or browser plugins are required. Everything runs instantly in standard modern desktop and mobile browsers.
Yes. All tools are fully responsive and touch-optimized for iOS, Android, tablets, and desktop computers.