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Free online tools for developers
Formatters, validators, converters, encoders, minifiers, escapers, and generators — 30 tools that run entirely in your browser. Nothing is uploaded, nothing is stored.
- 30 tools
- 0 bytes uploaded
- 100% client-side
Formatters
Beautify and pretty-print JSON, XML, HTML and SQL with your preferred indentation.
- JSON Formatter & BeautifierFormat JSON with your choice of indentation and a collapsible, color-highlighted tree.
- XML Formatter & BeautifierPretty-print XML with per-element indentation and color highlights.
- HTML Formatter & BeautifierFormat HTML documents with clean indentation and color highlights.
- SQL Formatter & BeautifierFormat SQL queries with keyword casing and indentation options.
Validators
Validate JSON, XML and HTML, test XPath queries and regular expressions, check credit card numbers.
- JSON ValidatorValidate JSON against the specification, in strict or lenient mode.
- XML Validator (Well-formedness)Check XML well-formedness and get precise parse errors.
- XPath TesterRun XPath expressions against XML and inspect the matched nodes.
- Regular Expression TesterHighlight regex matches, flags, groups and test replacements.
- Credit Card Validator & GeneratorValidate card numbers with the Luhn algorithm and generate test numbers.
Converters
Convert between JSON, XML, CSV and YAML, transform timestamps, and generate schemas.
- XML to JSON ConverterConvert XML to JSON with attribute prefix and text-property options.
- JSON to XML ConverterConvert JSON to XML with configurable root and array element names.
- CSV to JSON ConverterConvert CSV to a JSON array with delimiter and header options.
- CSV to XML ConverterConvert CSV rows into XML using a row template with placeholders.
- YAML to JSON ConverterConvert YAML to JSON with your preferred indentation.
- JSON to YAML ConverterConvert JSON documents to clean, indented YAML.
- Epoch Timestamp ConverterConvert Unix timestamps to dates and back, in seconds or milliseconds.
- XSD Generator (from XML)Generate an XML Schema from a sample XML document.
Encoders / Cryptography
URL and Base64 encoding, file encoding conversion, message digests, HMAC and QR codes.
- URL Encoder & DecoderPercent-encode or decode URLs and query strings.
- Base64 Encoder & DecoderEncode or decode Base64 text and files, Unicode-safe.
- Convert File EncodingConvert text between UTF-8, UTF-16, Latin-1 and more.
- Message Digest (MD5, SHA)Hash text with MD5, SHA-1, SHA-256, SHA-384 and SHA-512.
- HMAC GeneratorCompute HMAC signatures with SHA-1, SHA-256, SHA-384 and SHA-512.
- QR Code GeneratorGenerate QR codes for URLs, text, WiFi and contact data.
Minifiers / Beautifiers
Compress or beautify JavaScript and CSS without side effects.
- JavaScript BeautifierRe-indent JavaScript with your choice of braces and indentation.
- JavaScript MinifierCompress JavaScript safely — no side effects on strings or eval.
- CSS BeautifierFormat stylesheets with clean indentation and spacing.
- CSS MinifierCompress CSS — strip comments, collapse colors and zero units.
String Escapers
Escape and unescape HTML, XML, JavaScript, JSON, CSV, SQL and Java strings.
- HTML Escape & UnescapeEscape HTML entities or unescape them back to plain text.
- XML Escape & UnescapeEscape or unescape XML-reserved characters.
- JavaScript Escape & UnescapeEscape strings for safe embedding in JavaScript source.
- JSON Escape & UnescapeEscape strings for embedding in JSON documents.
- CSV Escape & UnescapeEscape or unescape CSV fields with configurable delimiters.
- SQL Escape & UnescapeEscape strings as SQL string literals.
- Java & .NET EscapeEscape strings for Java or C# source literals.
Generators
Lorem ipsum text and Quartz cron expressions, generated and explained.
Text Utilities
String utilities, character counts, URL parsing and reference data.
- String UtilitiesCase conversion, counts, reverse, split and character details.
- URL Parser & Query SplitterBreak a URL into scheme, host, path and decoded query parameters.
- List of MIME TypesSearchable reference of MIME types and their file extensions.
- HTML Entities ReferenceSearchable list of HTML entities with names, numbers, and glyphs.
Web & i18n Reference
MIME types, HTML entities, country and timezone lists, and i18n formatting standards with code snippets.
Why DevToolHub?
DevToolHub is a collection of the everyday tools developers reach for: format a JSON payload, test a regular expression, convert YAML to JSON, check a cron expression, hash a webhook body. Every tool runs locally in your browser — your data never touches a server.
There is nothing to install and no account to create. Bookmark the tools you use and get back to work.