Tools
Formatters, encoders, generators and inspectors for everyday engineering work. Everything runs in your browser — nothing you paste leaves this tab.
Data & formats
- JSONFormat, minify, validate and repair JSON with exact error positions, a searchable tree view and JSONPath queries. Big numbers are kept exactly.
- Format & MinifyBeautify HTML, CSS, SCSS, Less, JavaScript, TypeScript, JSON, XML, SQL in 20 dialects, YAML, Markdown and GraphQL with Prettier, and minify HTML, CSS, JavaScript, JSON and XML. Shows exact error positions and how much minifying saves.
- ConvertConvert JSON to and from YAML, CSV/TSV, XML and query strings, or generate TypeScript interfaces and Zod schemas from a JSON sample. Handles multi-document YAML, quoted CSV fields, nested columns and XML attributes, and keeps big numbers exact.
Security
- JWTDecode, verify and sign JSON Web Tokens. Shows color-coded parts and readable claims with expiry status, and checks HS, RS, PS, ES and EdDSA signatures with a secret, PEM key, certificate or JWK.
- Hash & CryptoMD5, SHA-1, SHA-2, SHA-3, Keccak and CRC-32 hashes and HMACs of text or files, with checksum comparison. AES-GCM/CBC/CTR encryption compatible with OpenSSL and CryptoJS, bcrypt hashing and checking, and RSA, EC and Ed25519 key pairs as PEM or JWK.
Generators
- GeneratorsGenerate UUIDs (v1, v3, v4, v5, v6, v7), ULIDs, NanoIDs, MongoDB ObjectIds and random bytes in bulk, and inspect any UUID, ULID or ObjectId for its version and embedded time. Strong passwords and passphrases with their entropy shown, all from a cryptographically secure source.
- QR CodeMake QR codes for text, URLs, Wi-Fi networks, contact cards and emails. Choose the error correction level, size, quiet zone and colors (with a warning when contrast is too low), and download crisp SVG or PNG files.
Text
- DiffCompare two texts or JSON documents side by side or unified, with word- and character-level highlights, collapsible unchanged lines and change navigation. JSON mode ignores key order and lists every added, removed and changed path.
- RegexTest JavaScript regular expressions with live match highlighting, a match and capture group table, replace and split previews, a token-by-token explanation and a cheat sheet. Supports every flag including d-style indices, v and named groups, and stops runaway patterns instead of freezing the tab.
- TextConvert text between camelCase, snake_case, kebab-case, Title Case and more, make URL slugs, sort and dedupe lines, count words, characters, graphemes and bytes, escape strings for JSON, JavaScript, SQL, regex, CSV or shell, and generate lorem ipsum.
Web & design
- ColorConvert any CSS color between HEX, RGB, HSL, HWB, OKLCH, OKLab and CMYK, pick colors visually, check WCAG 2 contrast and APCA against a background, and build a tints and shades scale. Out-of-gamut colors are flagged.
- MarkdownWrite Markdown with a live, sanitized preview: CommonMark plus GitHub tables, task lists and strikethrough, with synced scrolling. Copy the HTML or download it as a complete page.
Time & network
- TimeConvert Unix timestamps (seconds to nanoseconds) to and from ISO 8601, RFC 2822 and any time zone, measure the time between two dates, add durations, and explain cron expressions with their next runs, DST included. Supports Quartz L, W and #.
- NetworkCalculate IPv4 and IPv6 CIDR blocks: network, broadcast, host range, netmask, wildcard, host count and a binary view, with private and reserved ranges named. Split a block into subnets, and check which blocks in a list contain an address or overlap each other.