Use the canonical 36-character UUID
The default 8-4-4-4-12 lowercase form contains 32 hexadecimal digits and four hyphens. Start here when an API, database, schema, or native UUID field expects conventional text.
Free online developer utility · no registration or login
Free UUID Generator Online
Generate one random UUID v4 or a batch of up to 100 in your browser. Choose canonical, uppercase, GUID-braced, or compact display, then copy individual values or export the full list as TXT, CSV, or JSON with no registration or login.
- UUID v4 only
- 1–100 per batch
- Four display formats
- TXT, CSV, and JSON export
UUID v4 workspace
Generate, verify, and export random UUIDs
Choose a practical batch size, display style, and file shape. Generation uses your browser Crypto API; no account or server generation request is required.
Common quantities
This page generates UUID version 4 only, with a maximum of 100 values per batch. GUID braces and compact output change the display, not the underlying identifier.
Generated UUIDs
Set the options, then generate a fresh batch.
No UUIDs generated yet
The result list, per-value copy controls, version checks, and export preview will appear after generation.
How to generate and export UUIDs
Choose the representation first, then verify and export the exact batch you generated.
- Step 1
Choose a count, format, and export type
Enter 1–100 or select a common quantity. Choose canonical, uppercase, GUID-braced, or compact display and decide whether the copied or downloaded batch should be TXT, CSV, or JSON.
- Step 2
Generate and verify the batch
Generate fresh UUID v4 values, then review the actual result count, version-and-variant pattern check, and the number of distinct values in the current batch.
- Step 3
Copy one value or export the full list
Use a row's copy control for one identifier, or copy and download the complete export representation shown in the result panel.
Common UUID batch tasks
Pick the export shape that reduces cleanup in the database, test, spreadsheet, or script that receives the batch.
- Prepare stable IDs before importing database seed records
- Create request and correlation IDs for test fixtures
- Download a labeled CSV column for spreadsheet workflows
- Export a JSON string array for automated tests
Choose the UUID format your system expects
Changing case, braces, or hyphens changes the text representation, not the underlying random UUID. The receiver's documented format should decide which display you use.
Use uppercase braces for GUID-style output
The GUID-style option wraps an uppercase UUID in braces. It is useful when a .NET, Windows, or legacy interface documents that convention, but the braces are not universally accepted.
Use compact output only when accepted
Compact output removes the four hyphens and leaves 32 lowercase hexadecimal characters. Some storage layers accept it, while strict UUID validators require the canonical separators.
Export UUID batches without cleanup
The selected export format controls Copy all, the preview, and the downloaded filename so the saved file matches the structure you reviewed.
Use plain text for one UUID per line
Plain text is convenient for seed lists, fixture columns, shell input, and manual imports that expect one identifier on each line.
Use CSV for a labeled table column
CSV output adds a uuid header and quotes every value. It is a single-column table intended for spreadsheet review or a tabular import step.
Use JSON for arrays and test fixtures
JSON output is a valid array of strings with the selected UUID display style. Use it where a test fixture, configuration file, or script expects a JSON array.
Choose UUID v4 for the right job
Random UUID v4 values are useful opaque identifiers, but ordering, authentication, retention, and authorization are separate application decisions.
Use v4 for opaque resource and test IDs
UUID v4 can label API resources, distributed records, requests, correlation events, and test fixtures without coordinating one shared sequence. Keep database constraints where duplicates cannot be accepted.
Consider v7 when time ordering matters
UUID v4 does not sort by creation time. If ordered database inserts or chronological identifiers matter, evaluate UUID v7 and the receiving system's support; this page intentionally generates v4 only.
Keep authentication secrets separate
A UUID can identify a session or token record, but it should not replace password hashing, secret generation, expiration, rotation, revocation, authorization, or secure storage.
Browser generation, uniqueness, and limits
The result panel reports evidence from the current batch while the page keeps important UUID and browser limitations visible instead of presenting randomness as a guarantee.
Generate with the browser Crypto API
The page uses crypto.randomUUID(), which produces UUID v4 values from a cryptographically secure random number generator in supported secure browser contexts. It does not fall back to Math.random().
Treat uniqueness as probabilistic
UUID v4 has a very large random space, but a collision remains possible in principle. Keep a uniqueness constraint and conflict handling whenever duplicate identifiers would be harmful.
Check version, variant, and batch duplicates
After generation, the workspace checks each raw value for the expected v4 version and RFC variant pattern and compares the Set size with the requested batch. This verifies the current output, not every future UUID.
UUID Generator FAQ
Direct answers about UUID v4, GUID formatting, bulk exports, collision risk, browser generation, and the difference between identifiers and secrets.
What is a UUID?
A UUID is a 128-bit identifier used to label information without coordinating one central counter. Its canonical text representation contains 32 hexadecimal digits in five hyphen-separated groups, for 36 characters in total.
Which UUID version does this tool generate?
This page generates UUID version 4 only through the browser Crypto API. UUID v4 uses 122 random bits after the standard version and variant fields are set; it does not embed a creation timestamp or device address.
Can I generate UUIDs in bulk?
Yes. Choose a whole number from 1 to 100 or use a common-quantity shortcut. Each result can be copied individually, and the full batch can be copied or downloaded as plain text, CSV, or JSON.
Are UUID v4 values guaranteed to be unique?
No random identifier is mathematically guaranteed never to collide. Correct UUID v4 generation provides an extremely large random space, but systems that require uniqueness should still use a unique constraint and handle a possible conflict.
What is the difference between a UUID and a GUID?
GUID is terminology commonly used in Microsoft and .NET environments for the same 128-bit identifier family. This page's GUID-style option displays the UUID in uppercase braces; it does not use a different generation algorithm.
Can I generate uppercase UUIDs, GUID braces, or UUIDs without hyphens?
Yes. Choose standard lowercase, standard uppercase, uppercase with GUID-style braces, or compact lowercase without hyphens. These are display transformations of the same generated value, and the receiving system may still require canonical hyphenated text.
When should I use UUID v4 instead of UUID v7?
Use UUID v4 when you need a random opaque identifier without an embedded creation time. Evaluate UUID v7 when natural chronological ordering or database index locality matters. This page does not generate UUID v7.
Can I use UUID v4 as a database primary key?
Many databases support UUID values, and v4 can work when independently generated opaque keys are useful. Check the database's native UUID type, indexing behavior, storage format, and uniqueness constraints; consider a time-ordered alternative when write locality matters.
Can I use a UUID as a password or session token?
Do not treat an identifier as a complete authentication design. Passwords, session secrets, reset tokens, authorization, expiration, rotation, and secure storage need purpose-built controls even when a UUID labels the related record.
Are generated UUIDs uploaded or stored?
The current page calls crypto.randomUUID() and keeps the generated batch in the active browser tab. It does not send the values to an external UUID generation service or require an account; reset or close the tab to remove the current result from the page.
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