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NeatUtility

UUID Generator

Generators100% Client-Side
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Configuration & Options

How many UUIDs to generate at once (1 to 1,000).

Format hex letters in uppercase (e.g., A-F instead of a-f).

Remove dashes between UUID segments (32 contiguous hex characters).

Enclose each UUID in curly braces (e.g., {c73bcdcc-...}).

Enclose each UUID in double quotes for array or JSON pasting.

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About this tool, examples & FAQ

Generate random version-4 UUIDs in batches from the browser cryptographic generator, entirely locally. Only v4 is supported; case, hyphen, brace, and quote options change presentation without changing the underlying identifier.

Key facts

Verified capabilities and limits of this utility
UUID versionVersion 4 only (random) via crypto.randomUUID; no UUID v7 mode
Batch sizeConfigurable count from 1 to 1,000 per run
Presentation optionsUppercase, hyphen-free, wrap-in-braces, and wrap-in-quotes
Accepted inputNone — generation takes options only, no input text
Execution deadline2 s
Processing locationBrowser-only: no input is collected or uploaded

How to use

  1. Select the number of UUIDs to generate (1 to 1,000).
  2. Toggle 'Uppercase' for uppercase hexadecimal, or 'Hyphen-free' for 32-character strings.
  3. Enable 'Wrap in Braces' or 'Wrap in Quotes' for code, JSON, or migration formatting.
  4. Click 'Run' to generate a fresh batch.
  5. Click 'Copy' to copy the entire list to your clipboard.

Example

Generate five UUIDs

Input

Sample output (illustrative)

Illustrative sample; live output is random
550e8400-e29b-41d4-a716-446655440000

Edge cases

Count clamping

Counts below 1 are raised to 1 and counts above 1,000 are capped at 1,000, so out-of-range requests still produce a bounded batch.

No input required

Generation takes no input: every run draws fresh random values regardless of any editor content.

Presentation preserves identity

Uppercase, hyphen removal, braces, and quotes only reformat the same 128-bit value for display or pasting.

Collisions are unlikely, not impossible

Random v4 collisions are astronomically unlikely at normal volumes but never impossible; do not treat uniqueness as a guarantee.

Not authentication tokens

Randomness alone does not make an identifier a secure credential: do not use bare UUIDs as passwords or session tokens.

How it works

  1. Clamps the requested count to the supported range.
  2. Draws one version-4 UUID per item from the browser cryptographic generator.
  3. Applies lowercase normalization, then hyphen, case, brace, and quote presentation in order.
  4. Joins the batch with newlines inside a Web Worker bounded by the tool deadline.

Related workflows

Frequently asked questions

What is the difference between a UUID and a GUID?

They describe the same 128-bit identifier format: GUID is the Microsoft name for the hyphenated 8-4-4-4-12 representation this tool emits by default.

Which UUID version does this tool generate?

Version 4 only: every identifier is drawn from cryptographically secure random numbers via crypto.randomUUID, with the version and variant bits set accordingly.

Does this tool generate UUID v7?

No. Time-ordered UUID v7 — designed for sortable database keys — is not a supported mode here; every generated value is a random v4 identifier.

Should I use uppercase or lowercase?

Both represent the same identifier: lowercase is the conventional default, uppercase suits systems that require it. Hyphen removal likewise only changes the 36-character versus 32-character presentation.

How many UUIDs can I generate at once?

Between 1 and 1,000 per run. Out-of-range counts are clamped into that range, and each run draws a fresh random batch.

How random are the generated UUIDs?

Values come from the browser Web Cryptography generator (crypto.randomUUID), giving high-entropy randomness. Collisions remain theoretically possible, so treat IDs as unique-by-chance, not unique-by-proof.

References