UUID Generator Online for Free - Secure and Fast

Generate v4 UUIDs securely with the Web Crypto API.

Runs fully in your browser. No file upload required.Last updated: 2026-03-10

UUID Generator tool interface

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What It Does

Generate v4 UUIDs securely with the Web Crypto API.

Nextooly’s UUID Generator creates secure, RFC-4122 compliant v4 UUIDs using the Web Crypto API for high-quality randomness. Generate a single UUID or up to 1000 at once, customize formatting (uppercase/lowercase, hyphens, prefixes, suffixes), and export results easily.

All UUID generation is done fully in your browser without any logging or data transmission, making it ideal for developers, testing environments, local scripts, prototyping, and tools that require unique identifiers.

Example

Input: Your chosen settings, seed text, or options for the UUID Generator workflow.

Output: A generated result that is ready to copy, save, or download.

Best For

People who need to generate uuid quickly without installing software.
Developers debugging payloads, tokens, URLs, or source snippets.
QA and support teams validating technical data without opening a full IDE.
Anyone who needs quick browser-based utilities during day-to-day coding work.
Teams handling sensitive files or text that should stay on-device.
Not ideal for: heavily malformed data that needs scripting or deeper cleanup first.

Key Features

Runs entirely in your browser for a private, on-device workflow.
Keeps files and text on your device with no server upload step.
Lets you export or download the finished result right away.
Includes copy-friendly output for faster reuse in other tools or tickets.
Gives you control over output quality or compression where it matters.
Handles structured data settings such as delimiters, headers, flattening, or pretty printing.

Pricing

Plan type: Free
Price: $0
Limits: Great for quick browser tasks; automated pipelines and very large payloads may need local scripts or APIs.

Pros

Keeps sensitive input on your device.
Includes practical controls for common real-world inputs.
Produces output you can use immediately.

Cons

Results can vary based on browser permissions and which web APIs your device exposes.
Advanced automation or team-wide workflows may still need desktop software or APIs.

Alternatives

If UUID Generator is close but not quite the right fit, these related Nextooly tools cover adjacent developer & code workflows without sending you to another service.

TOTP 2FA Generator

Best if you need to generate time-based one-time passwords (TOTP) with QR import, encrypted vault, multiple accounts, backup, and authenticator-style UI.

Hash Generator

Best if you need to compute SHA-256, SHA-1, and MD5 hashes for text and files.

Password Generator

Best if you need to generate strong, random passwords locally in your browser.

FAQ

Are UUIDs generated securely?

Yes. The tool uses `crypto.randomUUID()` when available. If not, it falls back to a safe RFC4122-style generator.

Does this tool upload or log the generated UUIDs?

No. All UUIDs are generated locally and never sent to any server.

How many UUIDs can I generate at once?

You can generate between 1 and 1000 UUIDs in a single batch.

Can I customize the output?

Yes. You can choose lowercase/uppercase, with or without hyphens, and add optional prefixes or suffixes.

Can I download all UUIDs?

Yes. You can copy them to clipboard or download a `.txt` file containing all generated UUIDs.

Why does the tool have a delimiter setting?

The delimiter controls how the UUIDs are joined (e.g., newline, comma, space) when output is copied or downloaded.

Can I rely on these UUIDs for security-sensitive applications?

No. Although generated securely, this tool is not intended for cryptographic or high-security uses.

Last Updated

2026-03-10

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What It Does

Generate v4 UUIDs securely with the Web Crypto API.

Example

Input: Your chosen settings, seed text, or options for the UUID Generator workflow.

Output: A generated result that is ready to copy, save, or download.

Best For

People who need to generate uuid quickly without installing software.

Developers debugging payloads, tokens, URLs, or source snippets.

QA and support teams validating technical data without opening a full IDE.

Anyone who needs quick browser-based utilities during day-to-day coding work.

Teams handling sensitive files or text that should stay on-device.

Not ideal for: heavily malformed data that needs scripting or deeper cleanup first.

Key Features

Runs entirely in your browser for a private, on-device workflow.

Keeps files and text on your device with no server upload step.

Lets you export or download the finished result right away.

Includes copy-friendly output for faster reuse in other tools or tickets.

Gives you control over output quality or compression where it matters.

Handles structured data settings such as delimiters, headers, flattening, or pretty printing.

Alternatives

If UUID Generator is close but not quite the right fit, these related Nextooly tools cover adjacent developer & code workflows without sending you to another service.

TOTP 2FA Generator

Best if you need to generate time-based one-time passwords (TOTP) with QR import, encrypted vault, multiple accounts, backup, and authenticator-style UI.

Hash Generator

Best if you need to compute SHA-256, SHA-1, and MD5 hashes for text and files.

Password Generator

Best if you need to generate strong, random passwords locally in your browser.

FAQ

Are UUIDs generated securely?

Yes. The tool uses `crypto.randomUUID()` when available. If not, it falls back to a safe RFC4122-style generator.

Does this tool upload or log the generated UUIDs?

No. All UUIDs are generated locally and never sent to any server.

How many UUIDs can I generate at once?

You can generate between 1 and 1000 UUIDs in a single batch.

Can I customize the output?

Yes. You can choose lowercase/uppercase, with or without hyphens, and add optional prefixes or suffixes.

Can I download all UUIDs?

Yes. You can copy them to clipboard or download a `.txt` file containing all generated UUIDs.

Why does the tool have a delimiter setting?

The delimiter controls how the UUIDs are joined (e.g., newline, comma, space) when output is copied or downloaded.

Can I rely on these UUIDs for security-sensitive applications?

No. Although generated securely, this tool is not intended for cryptographic or high-security uses.