How to Generate a UUID

Generate universally unique identifiers (UUID v4) and NanoIDs for databases, APIs, and application development.. This step-by-step guide walks you through the process using LevnTools UUID / NanoID Generator, a free browser-based tool that handles everything locally on your device. No software to install, no account to create, and no files uploaded to external servers. Follow these steps to complete the task in under a minute — updated for 2026.

Select the ID type

Choose between UUID v4 (standard 36-character format like 550e8400-e29b-41d4-a716-446655440000) or NanoID (shorter, URL-friendly IDs with customizable length and alphabet).

Configure options

Generate IDs

Click Generate to create one or more unique identifiers. You can generate multiple IDs at once if you need a batch. Each ID is cryptographically random.

Copy and use

Copy individual IDs or the entire batch. Use them as database primary keys, API tokens, session identifiers, or file names.

Pro Tips

UUID v4 has a collision probability so low it is practically zero — safe for distributed systems without coordination.
NanoIDs are shorter and URL-safe, making them great for user-facing identifiers and short links.
For database primary keys, consider whether sequential IDs or random UUIDs are better for your indexing strategy.

Common Issues & Fixes

Issue: I need a UUID in a specific format without dashes.

Fix: Copy the UUID and remove the dashes, or check if the tool has a "no dashes" output option.

Issue: Is NanoID as unique as UUID?

Fix: At the default length of 21 characters with the default alphabet, NanoID has comparable collision resistance to UUID v4. Shorter NanoIDs have higher collision probability.

Step-by-Step: How to Generate a UUID

Complete this task using LevnTools UUID / NanoID Generator by following each step below. Every step runs in your browser with zero server interaction.

Step 1: Select the ID type

Choose between UUID v4 (standard 36-character format like 550e8400-e29b-41d4-a716-446655440000) or NanoID (shorter, URL-friendly IDs with customizable length and alphabet). UUID / NanoID Generator handles this step entirely in your browser, so your developer files remain private throughout. After completing this step, proceed to the next one to continue processing.

Step 2: Configure options

For UUID, the format is fixed. For NanoID, set the desired length (default 21 characters) and character set (alphanumeric, alphanumeric + symbols, or custom). Longer IDs have lower collision probability. UUID / NanoID Generator handles this step entirely in your browser, so your developer files remain private throughout. After completing this step, proceed to the next one to continue processing.

Step 3: Generate IDs

Click Generate to create one or more unique identifiers. You can generate multiple IDs at once if you need a batch. Each ID is cryptographically random. UUID / NanoID Generator handles this step entirely in your browser, so your developer files remain private throughout. After completing this step, proceed to the next one to continue processing.

Step 4: Copy and use

Copy individual IDs or the entire batch. Use them as database primary keys, API tokens, session identifiers, or file names. UUID / NanoID Generator handles this step entirely in your browser, so your developer files remain private throughout. Once this step completes, your result is ready to download and use immediately.

Tips for Better Results with UUID / NanoID Generator

Getting the best output from UUID / NanoID Generator comes down to a few practical tips. UUID v4 has a collision probability so low it is practically zero — safe for distributed systems without coordination.. NanoIDs are shorter and URL-safe, making them great for user-facing identifiers and short links.. For database primary keys, consider whether sequential IDs or random UUIDs are better for your indexing strategy.. Following these recommendations ensures consistent, high-quality results every time you use UUID / NanoID Generator.

Common Issues and Fixes

If you run into problems while using UUID / NanoID Generator, these are the most common issues and their solutions. Issue: I need a UUID in a specific format without dashes.. Fix: Copy the UUID and remove the dashes, or check if the tool has a "no dashes" output option.. Issue: Is NanoID as unique as UUID?. Fix: At the default length of 21 characters with the default alphabet, NanoID has comparable collision resistance to UUID v4. Shorter NanoIDs have higher collision probability.. If none of these solutions resolve your problem, try clearing your browser cache and reloading UUID / NanoID Generator.

Try UUID / NanoID Generator Now — Free

Frequently Asked Questions

Open LevnTools UUID / NanoID Generator in your browser and follow the 4-step process outlined in this guide. Start by select the id type, then the entire process takes under a minute. No account or download is required.

LevnTools UUID / NanoID Generator is the best free option for this task because it runs entirely in your browser with no file uploads, no account requirements, and no usage limits. For users who value privacy and cost, it is the top choice in 2026.

Yes, LevnTools UUID / NanoID Generator works on mobile browsers including Chrome for Android, Safari for iOS, and Firefox Mobile. The interface adapts to smaller screens, and all processing happens locally on your device regardless of whether you use a phone, tablet, or desktop computer.

No, LevnTools UUID / NanoID Generator runs entirely in your web browser. There is nothing to install, no plugins required, and no desktop application to download. Open the tool page, follow the steps in this guide, and download your result. It works on any modern browser across all operating systems.

Yes, using LevnTools UUID / NanoID Generator to generate a uuid is completely free. There are no premium features locked behind a paywall, no per-file charges, and no daily usage limits. The tool is and will remain free because all processing happens client-side, eliminating server costs.