UUID / ULID / NanoID Generator
Generator to create UUID, ULID, or NanoID in bulk
Features
Support for 3 identifier types
Switch between UUID, ULID, and NanoID on the fly
Bulk generation up to 100 items
Specify a count and create them all at once
Adjustable NanoID length
Freely customize length from 4 to 64 characters
Copy with one click
Copy individually or all at once
How to Use
Select a type
Choose UUID, ULID, or NanoID
Specify count and length
Enter the number to generate (and length for NanoID)
Generate
Press the Generate button to display the list
Copy and use
Copy individually or use Copy All to get them together
Use Cases
Database primary key samples
Generate unique IDs in bulk for dummy primary keys or initial data during development
API key and token samples
Quickly obtain sample strings for design documents and documentation
Unique ID generation for test data
Prepare unique IDs in bulk for QA testing and E2E testing
Sortable time-series IDs (ULID) verification
Test the appearance and length of identifiers that can be sorted by generation order
Basic Knowledge
What is UUID
UUID is an "ID that is virtually non-duplicate worldwide" created from a 128-bit value, expressed in hexadecimal with 8-4-4-4-12 digits (example: 550e8400-e29b-…). The widely used v4 is generated from random values.
Differences between UUID, ULID, and NanoID
- ULID：ULID is a 26-character identifier that includes timestamp information at the beginning and can be sorted chronologically by millisecond (order within the same millisecond is not guaranteed), making it suitable for database primary keys.
- NanoID：NanoID is a short identifier composed only of URL-safe characters, with adjustable length, making it suitable for shortened URLs and invitation codes.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
Identifier generation is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
Generated identifiers and input suggestions are not stored on the server.
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Updates
- update #97
Added new tool for batch generating UUID, ULID, and NanoID
Featured Tools
RAKKOTOOLS is free to use!
Available free of charge for individuals and corporations, commercial and non-commercial use alike.No prior permission or usage application is required. Feel free to use it in various situations.
Use in streaming and videos
Use various tools such as lottery draws and raffles in live streams and videos.
Use in schools, work, and events
Can be used in various situations such as classes, team division, internal work, and events.
Introduction on Web, books, and SNS
Feel free to introduce it as a useful tool on web media, books, SNS, and other platforms.
Commercial use
Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.