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Start with the tool whose input field best matches your technical input. This avoids unnecessary options and gets you to a reliable result faster.
25 tools
Development
25+ free developer tools: JSON formatter, Base64, JWT decoder, regex tester, UUID generator and more. No upload, and they also work offline.
Popular tools
JSON FormatterValidate, format, minify, analyze, and inspect JSON as a tree locally.RegEx TesterTest JavaScript regular expressions locally, inspect matches and capture groups, and preview replacements.UUID / GUID GeneratorGenerate UUIDs and GUIDs locally in the browser, export batches, and use v4 or v7.
JSON & data formats11
Format JSON and convert between data formats.
JSON FormatterValidate, format, minify, analyze, and inspect JSON as a tree locally.JSON to CSVConvert JSON files or pasted JSON text to CSV directly in the browser.CSV to JSONConvert CSV, TSV files, or pasted table data to JSON directly in the browser.JSON to XMLConvert JSON files or pasted JSON text to XML directly in the browser.XML to JSONConvert XML files or pasted XML text to JSON directly in the browser.JSON to YAMLConvert JSON files or pasted JSON text to YAML directly in the browser.YAML to JSONConvert YAML files or pasted YAML text to JSON directly in the browser.JSON to TOMLConvert strict JSON to readable TOML locally in the browser.JSON to TypeScript InterfaceInfer TypeScript interfaces and type aliases from JSON sample data locally in the browser.JSON to SQL INSERTConvert JSON objects and object lists to SQL INSERT statements directly in the browser.CSV to Markdown TableConvert CSV, TSV, and delimiter-separated data to GitHub-Flavored Markdown tables locally in the browser.
Query & test6
Try out queries, patterns and expressions.
RegEx TesterTest JavaScript regular expressions locally, inspect matches and capture groups, and preview replacements.JSONPath Query EvaluatorRun RFC 9535 JSONPath queries locally against JSON and show normalized paths.JMESPath EvaluatorRun JMESPath Core expressions locally against JSON and export the JSON result.XPath Tester / PlaygroundTest XPath 1.0 in the browser and XPath 3.1 locally against XML or HTML documents.SQL FormatterFormat and beautify SQL scripts locally in the browser.Cron Expression DescriptorExplain, validate, and preview upcoming run times for cron expressions locally.
Encoding & security8
Encode, decode and generate identifiers.
Base64 EncoderEncode text or local files to Base64, Base64URL, MIME Base64, or data URLs directly in the browser.Base64 DecoderDecode Base64, Base64URL, MIME Base64, or data URLs to bytes directly in the browser.URL EncoderPercent-encode text, paths, query values, and form data locally in the browser.URL DecoderDecode percent-encoded URL components, paths, query strings, and form data locally.JWT DecoderDecode JWTs locally, inspect claims, and optionally verify HMAC signatures in the browser.bcrypt / MD5 / SHA-256 GeneratorGenerate and verify bcrypt password hashes and calculate MD5 and SHA-256 digests locally.UUID / GUID GeneratorGenerate UUIDs and GUIDs locally in the browser, export batches, and use v4 or v7.Hex / Decimal / Binary / Octal ConverterConvert numbers exactly between hexadecimal, decimal, binary, and octal.