12 browser tools
Developer tools
Handle text, tokens, timestamps and CSV locally. No account, API key or server-side processing is needed.
Hash GeneratorGenerate SHA-256, SHA-384 or SHA-512 hashes from UTF-8 text.JWT DecoderRead a JWT’s JSON header and payload locally, without verifying it.Unix Timestamp ConverterConvert Unix seconds or milliseconds to dates, and ISO dates back to Unix time.Base64 Encode / DecodeEncode UTF-8 text as Base64 or decode Base64 back to readable text.URL Encode / DecodePercent-encode a URL component or decode it back to UTF-8 text.CSV to JSONConvert CSV rows to JSON with quoted-field support and strict validation.UUID GeneratorGenerate random UUID v4 or timestamp-based UUID v7 identifiers locally.Password GeneratorGenerate strong random passwords in your browser with the Web Crypto API. Choose length, character types and look-alike exclusion, and see the entropy of each password.JSON Formatter & ValidatorBeautify JSON with 2 or 4 spaces or tabs, minify it, sort object keys, and validate it with line and column error positions.Regex TesterTest a JavaScript regular expression against sample text and list every match with its index, numbered groups and named groups.Color ConverterConvert colours between HEX, RGB and HSL (with alpha), preview the colour and check its WCAG contrast ratio against white and black text.HTML Entity Encode / DecodeEscape <, >, &, quotes and optionally all non-ASCII characters as HTML entities, or decode named and numeric entities back to text.
Work locally, with clear limits
Each tool explains its inputs, method and limitations. Outputs are created on your device. Read the methodology or search all tools.