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Set your count and click Generate// bulk-generate uuid v4 values in one click
Generate hundreds of UUID v4 values instantly. Export as CSV, JSON, or plain text. Free, browser-based, no sign-up required.
Ready to generate
Set your count and click GenerateEnter how many UUID v4 values you need — up to 10,000 per batch.
Select uppercase, braces, quotes, or urn prefix to match your use case.
Copy all to clipboard or download as TXT, CSV, or JSON with one click.
UUID v4 (Universally Unique Identifier version 4) uses random numbers to create a 128-bit identifier. With 2¹²² possible values, collisions are astronomically unlikely. This tool generates cryptographically random UUID v4s — no server, no storage, fully private.
You can generate up to 10,000 UUID v4 values in a single batch. For larger datasets, run multiple batches and combine the exports.
Yes. UUID v4 generation uses crypto.getRandomValues() in the browser — the same cryptographically secure source used for passwords and tokens. They are not predictable.
You can download as plain text (one UUID per line), CSV (with a "uuid" header column), or JSON (an array of UUID strings). All formats are ready to import into databases, spreadsheets, or code.
Both are valid. The UUID specification (RFC 4122) allows either. Most systems accept both, but some APIs or databases may require a specific case. The Uppercase toggle converts a-f hex digits to A-F.
It's a URN (Uniform Resource Name) namespace for UUIDs, defined in RFC 4122. For example: urn:uuid:550e8400-e29b-41d4-a716-446655440000. This is useful in XML documents, LDAP, and some API schemas that require fully qualified identifiers.
No. All UUID generation happens entirely in your browser using JavaScript's crypto.randomUUID() API. Nothing is transmitted or stored anywhere.
When you need more than one UUID, you need a bulk generator. Whether you're seeding a test database, building fixture files for CI/CD pipelines, or generating thousands of IDs for a data migration script, doing it one at a time is not an option. This free UUID v4 Bulk Generator lets you create up to 10,000 cryptographically random UUID v4 values in a single click — with flexible output formats and instant export.
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UUID stands for Universally Unique Identifier. It is a 128-bit label standardized by RFC 4122 and used across virtually every programming language, database, and distributed system. A UUID looks like this:
550e8400-e29b-41d4-a716-446655440000
The "v4" refers to version 4, which generates the identifier using random or pseudo-random numbers. Unlike UUID v1 (which encodes the MAC address and timestamp) or UUID v5 (which uses a name-based hash), v4 is purely random. The only structure is a version indicator in the 13th character (always 4) and a variant indicator in the 17th character (always 8, 9, a, or b).
With 122 bits of randomness, the probability of generating a duplicate UUID v4 is so astronomically small that in practice, every generated value can be treated as globally unique without any coordination between systems.
Developers and data engineers need large sets of UUIDs in many scenarios:
This tool supports three export formats:
xargs, or any tool that reads line-delimited input.uuid header. Import directly into Excel, Google Sheets, or any SQL tool that accepts CSV.Uppercase vs. Lowercase: RFC 4122 is case-insensitive. Most modern systems accept both. Some legacy databases or APIs may require one specific case — toggle accordingly.
Curly Braces: Wraps each UUID in {...} — the format used by Microsoft's GUID convention and some COM/OLE interfaces: {550e8400-e29b-41d4-a716-446655440000}.
Quotes: Wraps each UUID in double quotes. Useful when building a JSON array manually or pasting into a comma-separated list in SQL.
URN Prefix: Prepends urn:uuid: to each value. Required by some XML schemas, LDAP directories, and OpenID specifications.
All generation happens in your browser using the Web Cryptography API (crypto.randomUUID()). No UUID values are sent to any server, logged, or stored anywhere. The tool works offline once the page is loaded. This makes it safe to use even in air-gapped environments or when working with sensitive project IDs.
If you're deciding which UUID version to use, here's a quick comparison:
For most use cases — especially bulk ID generation for databases and APIs — UUID v4 is the right choice.