UUID in Python

Python UUID Generator

Python's uuid module covers the whole of RFC 9562 — and since 3.14 it includes the versions developers were previously pip-installing.

Standard libraryv4, v5, v6, v7, v8NIL and MAX

Version

How many

Uppercase Hyphens Braces { }

Result

Generated locally with the Web Crypto API — nothing leaves your browser.

Generating UUIDs in Python

uuid.uuid4() returns a random UUID built from os.urandom, so it is cryptographically secure and the right default for almost everything. It is a UUID object, not a string: call str() for the hyphenated form, or use .hex for the 32-character form with no hyphens.
Python 3.14 added uuid6(), uuid7() and uuid8() as well as the uuid.NIL and uuid.MAX constants, so time-ordered primary keys need no third-party package any more. On 3.13 and earlier the uuid6 package fills the same gap.

How to generate

Press Generate UUID above to mint a value in this browser — nothing is sent anywhere.
Copy one value with Copy, or set How many and use Copy all for a fixture list.
Switch Version if your code needs v7 instead of the v4 default, and turn on Formatting to match your stack's conventions.

Use Cases

Django primary keys — UUIDField(default=uuid.uuid4), and v7 keeps the index sequential.
SQLAlchemy models — the same default, mapped as uuid.UUID.
Deterministic IDs — uuid5() turns a name into a reproducible identifier for idempotent jobs.

How Python UUID Generator Compares

uuid.uuid4()	Random, CSPRNG, the safe default
uuid.uuid7()	Time-ordered — Python 3.14+, or the uuid6 package
uuid.uuid5()	Deterministic from a name; same input, same ID, always

Code Examples

Python

import uuid

str(uuid.uuid4())          # v4, random  -> '65e82210-1a2d-4011-a064-a6a60565aa41'
uuid.uuid7()               # v7, time-ordered (Python 3.14+)
uuid.uuid5(uuid.NAMESPACE_DNS, 'example.com')  # deterministic
uuid.NIL                   # 00000000-0000-0000-0000-000000000000 (3.14+)

u = uuid.uuid4()
u.hex                      # 32 chars, no hyphens
u.bytes                    # 16 raw bytes

Django

import uuid
from django.db import models

class Order(models.Model):
    # Pass the function, NOT uuid.uuid4() — calling it would give every
    # row the same value.
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

Frequently Asked Questions

How do I get a UUID v7 in Python?

On Python 3.14 or later, uuid.uuid7() is in the standard library. On 3.13 and earlier, install the uuid6 package and call uuid6.uuid7().

Why do all my rows get the same UUID in Django?

You wrote default=uuid.uuid4() with parentheses. That evaluates once at import time; pass the function itself — default=uuid.uuid4.

Is the Python uuid module cryptographically secure?

uuid4() is — it is seeded from os.urandom. uuid1() embeds the host MAC address and timestamp instead, so avoid it for anything user-visible.