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UUID Use Case

UUID Device ID

A device ID lets you recognise 'this phone' across sessions without cookies that follow a person. A UUID is anonymous and resettable.

AnonymousResettablev4

Version

How many

Uppercase Hyphens Braces { }

Result

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

What Is UUID Device ID?

Store a UUID device ID locally and send it with requests to distinguish clients for rate-limiting and fraud checks.
Because it is random and not tied to hardware, users can reset it by clearing storage.

How to generate

Generate a v4 UUID on first launch; persist it.
Send it as a header or in analytics payloads.
Offer a reset that mints a new UUID.

Use Cases

Anti-fraud signal.
Anonymous analytics.
Trial abuse prevention.

Code Examples

JavaScript

let did = localStorage.getItem('did') ?? crypto.randomUUID();
localStorage.setItem('did', did);

Frequently Asked Questions

Device ID vs cookie?

A device ID is app-scoped and resettable; cookies are domain-scoped and subject to consent rules.

Is it PII?

On its own, no — it is a random value with no link to a person until you associate it.

Related tools

UUID v1 Generator UUID v3 Generator UUID v4 Generator UUID v5 Generator UUID v6 Generator UUID v7 Generator UUID v8 Generator Bulk UUID Generator Short UUID Generator UUID Validator UUID Formatter UUID as a Primary Key UUID Database ID UUID Foreign Key UUID Shard Key UUID Partition Key UUID in a Composite Key UUID Surrogate Key UUID API Key UUID Session Token UUID Access Token UUID Refresh Token UUID Idempotency Key UUID Request ID UUID Correlation ID UUID Trace ID UUID CSRF Token UUID Nonce UUID Filename UUID Object Key UUID S3 Key UUID Upload ID UUID Cache Key UUID Blob Name UUID Temp File UUID User ID UUID Account ID UUID Customer ID UUID Device ID UUID Tenant ID UUID Client ID UUID Anonymous ID UUID Member ID UUID Message ID UUID Event ID UUID Job ID UUID Task ID UUID Queue Message ID UUID Transaction ID UUID Order ID UUID Invoice ID UUID Payment ID UUID Reset Token UUID Verification Token UUID Invite Code UUID API Secret UUID Share Link UUID Magic Link UUID Node ID UUID Worker ID UUID Lock ID UUID Cluster ID UUID Test Data UUID Seed Data UUID Fixture UUID Mock ID UUID Placeholder ID UUID Sample ID