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§ · free tool
UUID generator. Random IDs, made on your device.
Cryptographically-random UUID v4, NIL UUIDs and sortable ULIDs, up to 100 at once, with uppercase, hyphen and brace formatting. Generated in your browser with the Web Crypto API; nothing is ever uploaded.
A free online tool by Digital HeroesID type
Format
Generated locally with crypto.getRandomValues, nothing leaves your browser.
0 items
No server
§ 02 · what you can do
Every kind of ID you'll need.
Cryptographic UUID v4128-bit random identifiers drawn from the browser's Web Crypto API, real entropy, not Math.random.
Sortable ULIDs26-character IDs with a 48-bit timestamp prefix, lexicographically sortable and ideal for ordered database keys.
NIL UUIDsThe all-zero placeholder 00000000-… for testing, defaults and schema validation.
Bulk up to 100Generate a batch in one click, then copy them all or grab individual IDs with the per-row copy button.
Flexible formattingToggle uppercase, strip hyphens, or wrap each value in braces { } for C# GUIDs and configs.
Download as .txtExport the whole batch to a plain-text file for scripts, fixtures and database seeds, no upload, ever.
§ 03 · how to use it
Four steps, no manual.
- Pick the ID type, UUID v4, NIL UUID or ULID.
- Set how many (1 to 100) and choose your format: uppercase, hyphens or brace-wrapping.
- Click Generate. Results appear instantly and re-format live as you toggle options.
- Copy a single ID, Copy all at once, or Download .txt for your scripts and seeds.
§ 04 · faq
Frequently asked questions.
Is the UUID Generator free?
Yes, completely free for everyone. No sign-up, no account and no usage limits.
Are the UUIDs really random and safe to use?
Yes. UUID v4 values use the browser's Web Crypto API (crypto.randomUUID or crypto.getRandomValues), which is cryptographically strong, not the weaker Math.random. Version and variant bits are set per RFC 4122.
Is it private? Is anything uploaded?
No upload, ever. Every ID is generated in your browser on your own device, nothing is sent to a server, so it's safe for keys you don't want leaving your machine.
What's the difference between a UUID and a ULID?
A UUID v4 is 128 bits of pure randomness with no ordering. A ULID is a 26-character Crockford base32 string with a 48-bit timestamp prefix, so ULIDs sort chronologically, handy as ordered primary keys where UUID v4 would scatter your index.
Why don't the format options apply to ULIDs?
A ULID is defined as uppercase Crockford base32 with no hyphens, so uppercase, hyphen and brace toggles would break the format. The tool dims those options while ULID is selected. Uppercase, hyphens and braces apply to UUID v4 and NIL UUIDs.
Does it work offline?
Yes, once the page has loaded, generating, copying and downloading all keep working without a connection, because every bit of logic runs locally in your browser.
Published · Last updated .
