Bulk UUID Generator: Generate Multiple UUIDs at Once

Generate Multiple UUIDs in Bulk

Whether you are seeding a database, creating test fixtures, preparing batch imports, or migrating data between systems, you often need hundreds or thousands of unique identifiers at once. The ToolSparkr UUID Generator lets you generate up to 1,000 UUIDs with one click, in multiple output formats ready to paste into your code, SQL, CSV, or configuration files.

Common Bulk UUID Use Cases

• Database seeding — populate development and staging databases with realistic data. Every row needs a unique primary key, and auto-increment integers reveal record counts to users.
• Test data factories — automated test suites need unique identifiers for each test run. Hardcoded UUIDs in fixtures cause collision errors in parallel test execution.
• Data migration — when moving from auto-increment IDs to UUIDs, you need to pre-generate UUIDs for all existing records and update foreign key references.
• Batch API operations — idempotency keys for bulk API calls ensure that retrying a failed batch does not create duplicates.
• Configuration management — assigning unique identifiers to servers, containers, service instances, or IoT devices during provisioning.

Generating Bulk UUIDs Programmatically

# Python: generate 1000 UUIDs
import uuid
uuids = [str(uuid.uuid4()) for _ in range(1000)]

# Write to file, one per line
with open(\"uuids.txt\", \"w\") as f:
    f.write(\"\
\".join(uuids))

# Generate as SQL INSERT values
values = \", \".join(f\"('{u}')\" for u in uuids)
sql = f\"INSERT INTO items (id) VALUES {values};\"

// JavaScript: generate 500 UUIDs
const uuids = Array.from({ length: 500 }, () => crypto.randomUUID());

// As JSON array
console.log(JSON.stringify(uuids, null, 2));

// As CSV line
console.log(uuids.join(\",\"));

# Bash: generate 100 UUIDs using uuidgen
for i in $(seq 1 100); do uuidgen; done > uuids.txt

# Or using Python one-liner
python3 -c \"import uuid; print('\
'.join(str(uuid.uuid4()) for _ in range(100)))\"

Output Formats

Collision Probability

UUID v4 uses 122 random bits, giving 5.3 × 10^36 possible values. Even generating 1 billion UUIDs per second, it would take 100 years to have a 50% chance of a single collision. For any practical batch size — even millions of UUIDs — the probability of a duplicate is effectively zero.