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UUID Generator

Generate cryptographically secure UUIDs (v4) instantly — bulk generate, multiple formats, free.

✓ Free✓ No Login✓ UUID v4✓ Bulk Generate✓ 4 Formats✓ Download TXT
5
150
1 UUID Generated
1c8d3f05f-c38e-49cf-a473-7ea0a3458391

📚 UUID Structure

550e8400-e29b-41d4-a716-446655440000
Time low (8 hex)
Time mid (4 hex)
Version + time (4 hex)
Variant + clock (4 hex)
Node / random (12 hex)

⚡ Common Uses

→Database primary keys
→Session & auth tokens
→API request IDs
→File & asset naming
→Distributed system IDs
→Transaction references

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🔐Base64 Encoder→🔗URL Encoder→🔑Hash Generator→🔐Password Generator→💻JSON Formatter→
⚡

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UUID v1/v5, bulk export CSV, API access

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UUID Versions Explained

There are five UUID versions (v1–v5), each using a different algorithm. v4 is by far the most common for web and software applications.

VersionMethodRandom bitsSystem-safeBest for
UUID v1 Timestamp + MAC address0⚠ Leaks MACTime-series data, log ordering
UUID v4 RecommendedCryptographic random (CSPRNG)122✓ YesMost use cases — DB keys, tokens
UUID v5 SHA-1 hash of namespace+nameN/A✓ YesReproducible IDs from same input

📖 How to Use the UUID Generator

1

Set the Quantity

Use the slider to choose how many UUIDs to generate at once — from 1 to 50.

2

Choose a Format

Pick Standard, UPPERCASE, No Hyphens or With Braces depending on what your code or database requires.

3

Generate & Export

Click Generate. Copy individual UUIDs, Copy All as a newline-separated list, or Download TXT for database seeding scripts.

❓ Frequently Asked Questions

What is a UUID?+
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal characters separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. It is designed to be unique across all space and time without a central authority.
What is the difference between UUID v1 and v4?+
UUID v1 is based on the current timestamp and the MAC address of the machine generating it. UUID v4 is randomly generated. v4 is recommended for most applications as it does not leak system information like MAC address or creation time.
Are UUIDs truly unique?+
UUID v4 uses 122 bits of randomness, giving 2^122 possible values (~5.3 × 10^36). The probability of generating two identical UUIDs is astronomically small — effectively zero for any practical use case.
What are UUIDs used for?+
UUIDs are used as primary keys in databases, session tokens, transaction IDs, file names, API request IDs, and anywhere a unique identifier is needed without coordination between systems.
Is it safe to use UUIDs as public-facing IDs?+
UUID v4 is safe to expose publicly as it reveals no information about your system. However, they are guessable in theory (given enough attempts), so for security-sensitive tokens consider using a cryptographic random string instead.