KSUID Generator | Generate and Decode KSUIDs

KSUID generator and decoder: create K-sortable unique IDs with the Web Crypto API, or paste one to read its timestamp and payload. Bulk output. Free.

Also known as: ksuid generator · ksuid decoder · generate ksuid online · k-sortable unique id · ksuid timestamp extractor · ksuid vs uuid vs ulid · segmentio ksuid online · decode ksuid to date

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KSUID Options

How many KSUIDs (1 to 1000)

Timestamp (optional, your local time)

Leave empty to use the current time. A KSUID stores whole seconds, so milliseconds are dropped. Valid range: May 13, 2014 through June 19, 2150 (UTC).

Layout: 4-byte timestamp (seconds since 1400000000) + 16 random bytes

Encoding: base62 (0-9, A-Z, a-z), always 27 characters, case-sensitive

Randomness: crypto.getRandomValues, nothing leaves your browser

Generated KSUIDs

About the KSUID Generator and Decoder

A KSUID is a 27-character, K-sortable unique identifier made of a timestamp and 16 random bytes. Use this tool to generate KSUIDs in bulk, or paste existing ones to read the creation time and payload hidden inside them. Everything runs in your browser with the Web Crypto API.

Key Features

Generate 1 to 1000 KSUIDs at once, at the current time or at a timestamp you choose
Decode a list of KSUIDs and see each creation time in UTC and in your local US-formatted time
Shows the 4-byte timestamp, the 16-byte payload and the full 20-byte hex for every ID
Rejects wrong lengths, characters outside base62 and values that overflow 20 bytes
Handles the Nil (all zeros) and Max (aWgEPTl1tmebfsQzFP4bxwgy80V) constants from the reference spec
Copy or download the result as plain text, one ID per line

Use Cases

Check when a record was created from a KSUID in an event log or database row
Seed test fixtures with IDs that sort by time without a database sequence
Debug an ID from a support ticket by reading its embedded timestamp
Generate IDs at a fixed past timestamp to test pagination or time-range queries
Compare KSUID, ULID and UUIDv7 before picking a primary key format for a new Postgres or DynamoDB table
Confirm that an ID produced by the Go, Python or JavaScript KSUID library decodes to the expected time

Supported Formats

KSUID (segmentio/ksuid)

Base62 text

20-byte hex

Related Keywords

ksuid generator

ksuid decoder

generate ksuid online

k-sortable unique id

ksuid timestamp extractor

ksuid vs uuid vs ulid

segmentio ksuid online

decode ksuid to date

How is a KSUID different from a UUID or a ULID?

A KSUID is 20 bytes: a 32-bit timestamp counted in seconds from May 13, 2014 (Unix time 1400000000), followed by 16 random bytes, written as 27 base62 characters. A UUIDv4 is 16 random bytes with no time at all, written as 36 characters. A ULID is a 48-bit millisecond timestamp plus 80 random bits in 26 Crockford base32 characters, and UUIDv7 does the same in a 36-character UUID layout. KSUIDs trade millisecond precision for a much larger random payload, 128 bits against 80 in a ULID, so two IDs created in the same second still collide with negligible probability. Because the timestamp comes first, KSUIDs sort by creation time as plain strings, which keeps B-tree indexes in Postgres, MySQL and DynamoDB append-friendly. The 32-bit counter runs out in June 2150. Base62 is case-sensitive, so never lowercase or uppercase a KSUID, and note that the alphabet is 0-9 then A-Z then a-z, which is also the string sort order.

Your IDs stay in your browser

Generation uses crypto.getRandomValues and decoding is plain arithmetic, so no KSUID is sent to a server. Pro users get auto-save, which stores your last input in local storage on this device only.

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Frequently asked questions

What is KSUID Generator used for?

KSUID generator and decoder: create K-sortable unique IDs with the Web Crypto API, or paste one to read its timestamp and payload. Bulk output. Free.

Is KSUID Generator free to use?

Yes. KSUID Generator is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use KSUID Generator?

No. KSUID Generator works immediately in your browser with no signup, login, or email address required.

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