Tools / Generate & test / 09
UUID, ULID & hash
Runs locally · nothing uploadedBulk-generate UUID v4 and v7 or ULIDs, and hash text or files with MD5, SHA-1 or SHA-256.
Output0 ids
0 × UUID v7 · sortable by creation time (RFC 9562)Generated in this tab with crypto.getRandomValues
How it works
UUID v4 is random. UUID v7 and ULID start with a timestamp, so they sort by creation time, which keeps database indexes compact. Bulk ULIDs are monotonic: ids made in the same millisecond still sort in order.
Inspect reads the version, the variant and the embedded time of v1, v6 and v7 UUIDs and of ULIDs (RFC 9562).
Hashes are computed in this tab. Files are read in chunks, so large ones work and are never uploaded. MD5 and SHA-1 are fine for checksums, not for security.
Shortcuts
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RelatedBase64 & URL/base64 →