How to customize a identifier (without breaking it)
Colors, logos, sizes — what UUID Generator lets you change, and what you should leave alone. Browser-based, free, no signup, runs entirely on your device.
Generating a identifier sounds like it should require an app — and historically it did. UUID Generator runs the same thing in your browser tab, with one tap and no signup.
Open the tool: UUID Generator — Browser-only. Nothing is sent to a server.
What you can customize in UUID Generator
UUID Generator exposes the options that matter without overwhelming you with the ones that don't:
- Size — pick the smallest size that still scans reliably for your use case
- Color — foreground and background. Keep contrast high; aesthetics shouldn't fight readability
- Margin / "quiet zone" — the empty border around the identifier. Don't skip this; scanners need it
- Logo overlay — embed a brand image in the middle. Works because of built-in redundancy in the encoding
What you shouldn't change
- The error-correction level (raise it, don't lower it)
- The encoding format (let UUID Generator pick the best one for your input)
- The aspect ratio (always square — non-square identifiers are unreadable)
Use the tool
No upload, no signup, no daily limit.
Frequently asked questions
Can I customize the identifier's appearance?
Yes — size, color, error-correction, margin, and optional logo overlay are all supported.
Does UUID Generator store my generated identifier?
No. UUID Generator generates everything in your browser; nothing is uploaded, saved, or sent.
Can I generate identifiers in bulk?
Yes — drop a list of inputs and UUID Generator runs them all in sequence, packaged into a ZIP for download.
Will my identifier work after UUID Generator shuts down?
Yes — once generated, a identifier is a standalone artefact. It doesn't depend on UUID Generator continuing to exist.
Related guides
- UUID Generator on Android phones
- UUID Generator on iPhone — generate a identifier in mobile Safari
- UUID Generator: a beginner's step-by-step
- My identifier doesn't work — the five most common causes
- How to customize a file (without breaking it)
- How to customize a QR code (without breaking it)
Ready to try it?
Use the tool: UUID Generator. No upload, no signup, no daily limit.
Last reviewed May 2026. File-size limits, portal requirements, and software defaults change over time — always verify with the destination platform before uploading time-sensitive documents. References to third-party services and products are for descriptive purposes only and do not imply any partnership or endorsement.