Bulk UUID Generator · Up to 10,000 UUIDs · Free

Bulk UUID Generator

This bulk UUID generator lets you generate hundreds or thousands of UUIDs at once — v4, v7, or v1. Export as plain text, JSON, CSV, or SQL INSERT. All generated in your browser. Nothing sent to a server.

★ 100% Free✓ Up to 10,000 UUIDs🔒 Browser-Only★ RFC 9562 Compliant

Use Cases

How Our Bulk UUID Generator Works

Generating UUIDs one at a time works for most tasks, but several common scenarios call for a dedicated bulk UUID generator producing hundreds or thousands at once:

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Database Seeding

Pre-generate primary keys for test fixtures, database seeds, or migrations without hitting your application server.

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Test Data Generation

Fill test databases, mock APIs, or load-test harnesses with realistic UUID identifiers that match production format.

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Data Migration

Generate stable UUIDs for migrating integer-keyed tables to UUID-keyed schemas before running live migration scripts.

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API Mocking

Populate API mock responses with valid UUID identifiers for frontend development and integration testing.

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File & Object Naming

Generate unique names for S3 objects, uploaded files, or cache keys in bulk before a batch upload job.

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Script Pipelines

Download a plain-text file of UUIDs and pipe it into shell scripts, Python pipelines, or data processing workflows.

Version Guide

Which UUID Version for Bulk Generation?

VersionAlgorithmBest for bulk when2026 Status
v4 (Random)122 cryptographically random bitsOpaque, unguessable identifiers. No timestamp exposure. Works everywhere.Default — tokens, file names, API IDs
v7 (Unix Timestamp)48-bit Unix ms timestamp + 74 random bitsDatabase primary keys where time-ordered UUIDs improve B-tree index efficiency.Preferred for DB PKs — PostgreSQL 18, Laravel 11, Rails 8
v1 (Time-based)60-bit Gregorian timestamp + MAC/randomCompatibility with legacy v1-based systems.Avoid for new projects
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Why only v4 and v7 matter for bulk generation

UUID v3 and v5 are deterministic — you need a unique name for each, so bulk generation is meaningless. For any real bulk scenario, use v4 (opaque random) or v7 (time-ordered for database primary keys).

Export Formats

Export Format Guide

FormatOutputUse when
Plain TextOne UUID per lineShell scripts, Python pipelines, line-by-line processing
JSON Array[“uuid1″,”uuid2”,…]JavaScript/Node.js apps, API mock files, Postman environments
CSVComma-separated per lineSpreadsheets, database tools, CSV-based migration scripts
SQL INSERTINSERT INTO uuids (id) VALUES (…)Directly seeding a database table. Edit table/column names before running.

Code Examples

Generate Bulk UUIDs Programmatically

For server-side generation beyond 10,000 UUIDs or CI/CD integration, here are the fastest approaches:

Python — fast bulk generation
Python
import uuid, json count = 10_000 uuids = [str(uuid.uuid4()) for _ in range(count)] with open(‘uuids.txt’, ‘w’) as f: f.write(‘\n’.join(uuids)) with open(‘uuids.json’, ‘w’) as f: json.dump(uuids, f, indent=2)
Node.js 19+
Node.js
const { randomUUID } = require(‘crypto’); const { writeFileSync } = require(‘fs’); const uuids = Array.from({ length: 10_000 }, () => randomUUID()); writeFileSync(‘uuids.txt’, uuids.join(‘\n’)); writeFileSync(‘uuids.json’, JSON.stringify(uuids, null, 2));
PostgreSQL — generate inside the database
PostgreSQL
INSERT INTO your_table (id, created_at) SELECT gen_random_uuid(), NOW() FROM generate_series(1, 10000); — UUID v7 (PostgreSQL 18+) INSERT INTO your_table (id, created_at) SELECT uuidv7(), NOW() FROM generate_series(1, 10000);

FAQ

Frequently Asked Questions

Up to 10,000 UUIDs per generation in this browser-based tool. For larger batches use Python or Node.js code above, which run server-side without browser memory limits. Python generates 1 million UUID v4s in roughly 3 seconds on a modern machine.
Yes, for all practical purposes. UUID v4 has 2 to the power of 122 possible values. Even generating 10,000 at once, the probability of a collision within that set is roughly 1 in 100 trillion. The generator uses crypto.getRandomValues(), which is cryptographically secure, following the official RFC 9562 specification.
Use v7 for database primary keys. UUID v7 encodes a millisecond timestamp in the first 48 bits, so UUIDs generated in sequence insert in ascending order into B-tree indexes, avoiding the page splits and index fragmentation that random v4 UUIDs cause at scale. Use v4 for any non-PK use case where you want opaque, timestamp-free identifiers.
Yes. After generating, click Download to save as a file. The extension matches your format: .txt for plain text, .json for JSON array, .csv for CSV, and .sql for SQL INSERT. The file is created locally in your browser with no server involved.
No. Every UUID is generated in your browser using JavaScript and crypto.getRandomValues(). Nothing is transmitted anywhere. Open your browser’s Network tab and confirm zero outbound requests when you click Generate.

Need a Single UUID?

Our main generator supports all 8 versions — v4, v7, v1, v5, v6, v8, Nil, and Max — with copy, validate, and version tabs.

Open UUID Generator