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412 free converters and developer tools for data formats, encodings, colours, units, hashes and images. No sign-up, no uploads for local tools.
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Popular converters
View all tools →JSON FormatterBeautify and pretty-print JSON with 2-space, 4-space or tab indentation, with optional key sorting.XML FormatterBeautify and indent XML while keeping comments, CDATA sections, attributes and element order exactly as written.CSV to JSON ConverterConvert CSV to a JSON array of objects using the header row as keys, with delimiter auto-detection and type detection.YAML FormatterBeautify YAML with consistent indentation and optional key sorting. Validates syntax and supports multi-document files.HTML to Markdown ConverterConvert HTML to clean Markdown: headings, lists, links, images, code blocks and emphasis. Scripts and styles are dropped.SQL FormatterBeautify SQL queries with dialect-aware formatting for MySQL, PostgreSQL, SQL Server, Oracle, SQLite and more.Base64 EncoderEncode text to Base64 with full UTF-8 support (emoji and accents included), with optional MIME or PEM line wrapping.URL EncoderPercent-encode text for safe use in URLs and query strings, as a URL component, full URL or form data, with full UTF-8 support.JSON String EscapeEscape text for use inside a JSON string: quotes, backslashes, newlines and control characters, optionally ASCII-only.HEX to RGB ConverterConvert hex colour codes like #ff5733 or #fff to CSS rgb() values, with alpha support for 8-digit hex.Length ConverterConvert length units instantly: metres, feet, inches, miles, kilometres and more.Decimal to Binary ConverterConvert decimal numbers to binary (base 2), with optional 4- or 8-bit digit grouping. Handles huge and negative numbers.
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Featured developer tools
JSON FormatterBeautify and pretty-print JSON with 2-space, 4-space or tab indentation, with optional key sorting.JWT DecoderDecode a JSON Web Token to read its header and payload, with exp, iat and nbf shown as dates. The signature is not verified.Regex TesterTest JavaScript regular expressions live with highlighted matches, a capture group table and a replace preview.UUID GeneratorGenerate random v4 or time-ordered v7 UUIDs/GUIDs in bulk, with uppercase, brace and no-hyphen formats.SHA-256 Hash GeneratorGenerate the SHA-256 hash of text or bytes in hex or Base64, the most widely used secure hash.Unix Timestamp ConverterSee the current Unix epoch time live and convert timestamps to dates (UTC, local, relative) and dates back to timestamps.URL EncoderPercent-encode text for safe use in URLs and query strings, as a URL component, full URL or form data, with full UTF-8 support.SQL FormatterBeautify SQL queries with dialect-aware formatting for MySQL, PostgreSQL, SQL Server, Oracle, SQLite and more.
Recently added
JSON to TypeScript InterfaceGenerate TypeScript interfaces from sample JSON, with optional properties inferred from arrays.XPath TesterRun XPath 1.0 expressions against an XML document and see the matching elements, attributes or values.CSV Column ExtractorExtract and reorder chosen CSV columns by header name or position, e.g. "email, name" or "1, 3-4".HTML to JSX ConverterConvert HTML to React JSX: class to className, inline styles to objects, self-closing void tags and JSX comments.SQL to JSON ConverterConvert SQL INSERT statements into JSON records. Handles multi-row VALUES, quoted strings, NULL and booleans.Color Contrast CheckerCheck the WCAG 2.x contrast ratio between text and background colours with AA and AAA pass/fail results.CSS to JS Object ConverterConvert CSS declarations or rules into camelCase JavaScript style objects for React, CSS-in-JS or JSON.Cron Expression ParserExplain a 5-field cron expression in plain English and list its next run times in UTC.
Why ConvertDock?
Local processing. Text, data and image conversions run with JavaScript in your browser, so your files never leave your device.
One page per tool. Every converter has its own address, instructions, examples and related tools, so you can bookmark exactly what you need.
Honest about networking. The few tools that must contact a server, such as DNS lookups, are clearly labelled before you use them.