Bulk ULIDs
Input: 5
Output: Five 26-character Crockford Base32 IDs
Developer
ULID Generator
Generate, validate, and decode ULID timestamps locally.
Runs locallyNo uploadNo external API
Options
ULIDs are sortable identifiers and reveal approximate creation time.
Output
Generate ULIDs or paste one to validate and decode.
Generate ULIDs or paste one to validate and decode.
Runs in your browser. Input is not uploaded or sent to an external API.
Related tools
How to use ULID
Create lexicographically sortable ULIDs, validate pasted values, and decode the embedded millisecond timestamp.
- Paste or type your input.
- Load the sample if you want a quick check.
- Run the action, review the result, then copy only what you need.
Examples
Validate ID
Input: 01J0ZK4Z7S7Z7V8Z9X5R4P2Q1A
Output: Valid ULID with decoded timestamp
Sortable behavior
Input: Generate twice
Output: Later IDs sort after earlier IDs in normal string order
Common use cases
Use sortable identifiers
Choose ULID when approximate creation order matters in logs or fixtures.
Read ID time
Decode a ULID timestamp and compare with Unix Timestamp Converter.
Generate test data
Combine IDs with JSON to CSV or CSV to JSON fixture workflows.
Limitations
Clock-based prefix
ULIDs include time, so they may reveal approximate creation time.
Not authentication
ULIDs are identifiers, not secrets or access tokens.
FAQ
How is ULID different from UUID?
ULID includes a timestamp prefix and sorts by creation time; UUID v4 is random.
Can I decode when a ULID was created?
Yes. The first 10 characters encode a millisecond timestamp.
Does generation use external services?
No. Random bytes come from the browser crypto API.