UUID Generator — Generate GUIDs Free

Generate UUID v4 (GUID) identifiers in bulk. Choose from standard, uppercase, braces, or no-hyphens format. Instant download.

How to Use UUID Generator

Enter InputType or paste your input data into the tool interface

ProcessClick the action button to run the tool

Use OutputCopy or download the result for your project

UUID Generator — Free Developer Utility

UUID Generator — create UUID v4 (Universally Unique Identifier) and GUID (Globally Unique Identifier) values instantly in any format. UUIDs are 128-bit random identifiers commonly used as primary keys in databases, session IDs, API keys, file names for uploads, and any situation requiring a unique identifier that does not reveal sequence or count. UUID v4 generates 122 bits of random data, making the probability of collision astronomically low even across billions of generated values. Our generator produces cryptographically random UUIDs and lets you generate uuid values in bulk — up to 100 at once — which is handy for database seeding, test data generation, and batch record creation.

Keywords and Search Terms

Developers searching for this tool use terms like: uuid generator, generate uuid, guid generator, generate guid, unique identifier. Tooliby provides this utility free with no signup, no watermarks, and no data logging.

Privacy — Your Data is Never Stored

Every input you paste into Tooliby developer tools is processed in memory and immediately discarded. We do not log inputs, store results, or analyze your data. Your code, tokens, API keys, and sensitive strings stay completely private.

Frequently Asked Questions

UUID and GUID are the same thing. UUID is the generic standard term. GUID (Globally Unique Identifier) is Microsoft's name for the same concept. The format and generation are identical.

UUID v4 uses 122 bits of random data. The probability that two randomly generated UUIDs will match is approximately 1 in 5 undecillion. In practice, UUID collisions are effectively impossible.

UUID v1 is time-based and includes the MAC address of the generating machine — it reveals when and where it was generated. UUID v4 is purely random with no embedded information. Use v4 for privacy and security.

Yes, but UUID primary keys have performance implications for large tables in databases like MySQL that use B-tree indexes. UUID v7 (ordered) is better for this use case. For most applications, UUID v4 primary keys are perfectly fine.

Standard: 8-4-4-4-12 with hyphens and lowercase. Uppercase: same but uppercase letters. Braces: {UUID} format for .NET/C# usage. No hyphens: 32 hex characters without separators.