How to Generate UUID Identifiers in Bulk
Create RFC 4122 v4 UUIDs for databases, APIs, and app records with batch generation and one-click copy.
KPM Editorial · Guides · 2026-10-14 · 5 min read
What UUIDs are for
Universally Unique Identifiers are 36-character strings like 550e8400-e29b-41d4-a716-446655440000 used as database primary keys, order IDs, API request IDs, file names, and test fixtures. Version 4 UUIDs are randomly generated with 122 bits of entropy, making collisions practically impossible. A UUID Generator produces standards-compliant values in bulk so developers do not need to write scripts for routine testing.
Step-by-step guide
- Open the UUID Generator tool and choose how many identifiers you need, from one for a single record to up to 500 for seeding a database.
- Select lowercase or uppercase formatting. Lowercase is standard for most APIs and URLs, while uppercase suits some enterprise systems.
- Click Generate to create the batch instantly using secure random values.
- Review for obvious formatting needs, such as removing hyphens if your system expects a 32-character compact form.
- Use Copy All to move the list to your clipboard, then paste into SQL inserts, JSON fixtures, environment files, or spreadsheets.
Practical tips for better results
- Use UUIDs as public-facing IDs instead of sequential numbers to avoid exposing record counts.
- Store them in native UUID columns in Postgres or as indexed char fields elsewhere for faster lookups.
- For filenames, pair a UUID with a readable prefix like
invoice-plus the ID for easier debugging. - Generate fresh batches for test and production separately to prevent accidental data overlap.
Common mistakes to avoid
Do not use UUIDs where short human-friendly codes are needed, such as customer support ticket numbers. Do not truncate them arbitrarily, because shortening destroys uniqueness guarantees. Avoid version 1 UUIDs that embed MAC addresses if privacy matters.
Privacy note
Generation runs fully in-browser with local randomness. Your IDs, project names, and database schemas are never uploaded or stored, keeping internal system design private.
