UUID
Generator
Generate UUID v4 identifiers instantly. Single or bulk, with format options. Fast, free, and entirely in your browser.
How It Works
Configure
Choose format options: uppercase, lowercase, with or without hyphens.
Generate
Click Generate for a single UUID or Generate Bulk for multiple.
Copy
Copy individual UUIDs or all at once to your clipboard.
Generate UUID v4 identifiers online for database keys, idempotency tokens, request IDs, and session tracking. ConverterUp's UUID generator produces single or bulk identifiers using the browser's cryptographically secure random source, so collisions are statistically impossible. Backend developers, QA engineers, and devops teams can grab a fresh batch in seconds and paste them into seed data or configuration files. Generation runs locally with no server round-trip, which guarantees that the IDs you receive are not logged, replayed, or reused anywhere outside your machine.
Frequently asked questions
Are these UUIDs safe to use as primary keys?
Yes. UUID v4 has 122 bits of randomness from a cryptographically secure source, giving a collision probability low enough to be ignored at internet scale. They are widely used as primary keys in PostgreSQL, MongoDB, and DynamoDB.
How many UUIDs can I generate at once?
Up to 10,000 per batch, which is enough for most seeding tasks. The output appears as a list you can copy with one click or download as a TXT or CSV file.
Can I generate other UUID versions?
The tool focuses on v4 because it is the most common in application code. Switch the format option to lowercase or uppercase, with or without hyphens, depending on your storage requirements.
Are the UUIDs cryptographically secure?
Yes. They come from the browser's crypto.getRandomValues API, which is suitable for security tokens, session identifiers, and any case where guessability matters.