Dev Generators
Free developer generators for UUIDs, passwords, hashes, lorem ipsum, and regex testing.
CSS Grid Generator
Set rows, columns, gap and item spans, then copy HTML, CSS or Tailwind classes.
Cron Expression Generator
Free online cron expression generator. Pick common presets, build crontab schedules, and copy ready-to-paste expressions for Linux, Unix, and scheduling tasks.
CRC-16 Calculator
CRC-16 Modbus, CCITT-FALSE, XMODEM, Kermit, ARC, USB, X-25 and GENIBUS of text or hex bytes, computed in your browser.
CRC32 & Checksum Calculator
CRC-32, Adler-32, Fletcher-16 and Fletcher-32 checksums for text or files, computed in your browser.
MD5 Hash Generator
Free MD5 hash generator for text or files. Hex or Base64 output, checked against RFC 1321 test vectors.
SHA-1 Hash Generator
Free SHA-1 hash generator for text or files, checked against FIPS 180-4 vectors. Includes a note on why SHA-1 is deprecated.
SHA-256 Hash Generator
Free SHA-256 hash generator for text or files. Hex or Base64 output, computed in your browser.
SHA-384 Hash Generator
Free SHA-384 hash generator for text or files, with Base64 output for Subresource Integrity values.
SHA-512 Hash Generator
Free SHA-512 hash generator for text or files. Hex or Base64 output, computed in your browser.
HMAC Generator
Free HMAC generator: HMAC-SHA256, SHA-1, SHA-384 or SHA-512 from a secret key and message, checked against RFC 4231.
Hash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes for text or files online. Free hash generator using the browser SubtleCrypto API.
Lorem Ipsum Generator
Free online Lorem Ipsum generator for placeholder text. Generate paragraphs, sentences, or words of dummy text for design mockups and web development projects.
Password Generator
Strong random password generator: 8 to 128 characters, choose the character types, see the entropy in bits. Made in your browser, never sent.
Regex Tester
Free online regex tester. Test JavaScript regular expressions, find matches, and debug patterns with real-time highlighting.
JSON to JSON Schema Generator
Infer a JSON Schema (draft 2020-12) from one or many sample JSON documents, in your browser.
KSUID & ULID Decoder
Read the timestamp and payload inside a KSUID or ULID, in your browser.
UUID v7 & ObjectId Timestamp Decoder
Read the creation date inside a UUID v7 or MongoDB ObjectId, in your browser.
UUID Generator
Generate random UUIDs (v4) online. Create single or batches of unique identifiers with case and hyphen options.
PKCE Code Verifier & Challenge Generator
Generate a PKCE code_verifier and S256 code_challenge online (RFC 7636). Uses WebCrypto and base64url, runs entirely in your browser, and can also compute the challenge…