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Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
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- Fast No upload or download wait — results appear instantly.
- Free All tools are free to use, with no limits.
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Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
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UUID Generator
Generate random UUID v4 or time-ordered v7 identifiers, up to 1,000 at once, in any format. Check and decode any UUID.
Create unique identifiers instantly: random version 4 UUIDs, or the newer version 7 UUIDs that start with a timestamp so they sort by creation time — ideal for database keys. Generate one or a thousand, in lower or upper case, with or without hyphens or braces, or as a ready-to-paste list or JSON array.
UUIDs are made with your browser's cryptographically secure random number generator, on your device. Paste any existing UUID to see its version, variant and — for time-based UUIDs — when it was created.
How to use UUID Generator
- Choose the version: v4 (random) or v7 (time-ordered).
- Enter how many UUIDs you need (1–1000) and click Generate.
- Pick a format: UPPER CASE, without hyphens, in {braces}, one per line, quoted with commas, or a JSON array.
- Copy the result or download it as a text file. To check a UUID, paste it into the box below.
Features
- UUID version 4: 122 random bits from a cryptographically secure generator.
- UUID version 7 (RFC 9562): time-ordered, strictly increasing even within the same millisecond.
- Nil and Max UUIDs for tests and placeholders.
- Bulk: up to 1,000 at a time.
- Formats: lower or UPPER case, with or without hyphens, {braces}, quoted list or JSON array.
- UUID checker: version, variant and creation time of v1, v6 and v7 UUIDs; accepts urn:uuid:, braces and no hyphens.
- Works offline once loaded; nothing is sent to a server.
What is a UUID?
A UUID (universally unique identifier), also called a GUID in the Microsoft world, is a 128-bit number written as 32 hexadecimal digits in five groups: 8-4-4-4-12, for example 3f2b9c1e-7a4d-4e8b-9f21-6c0d5e7a1b34. The 13th digit shows the version and the 17th digit the variant.
UUIDs can be created anywhere — on a phone, a server or in a browser — without asking a central system, and still never collide in practice. That makes them popular for database keys, file names, request IDs and anything that needs a unique name.
UUID v4 vs v7: which should I use?
Version 4 is completely random and reveals nothing. Version 7 starts with the current time in milliseconds followed by random bits, so newer UUIDs sort after older ones. Databases store sorted keys much more efficiently, which is why v7 is recommended for primary keys.
| UUID v4 | UUID v7 | |
|---|---|---|
| Made from | 122 random bits | 48-bit timestamp + 74 random bits |
| Sortable by time | No | Yes |
| Database index performance | Can fragment indexes | Good: new keys go at the end |
| Reveals creation time | No | Yes, to the millisecond |
| Best for | Tokens, public IDs, anything that must not leak time | Primary keys, logs, event IDs |
| Standard | RFC 4122 / RFC 9562 | RFC 9562 (2024) |
UUID versions explained
Paste any UUID into the checker to see which version it is.
| Version | How it is made |
|---|---|
| 1 | Time + the computer's MAC address (can reveal the machine) |
| 3 | MD5 hash of a namespace and a name |
| 4 | Random |
| 5 | SHA-1 hash of a namespace and a name |
| 6 | Like v1 but with the time reordered so it sorts |
| 7 | Unix time in milliseconds + random |
| 8 | Custom, vendor-specific layout |
Can two UUIDs ever be the same?
In theory yes, in practice no. A v4 UUID has 122 random bits — about 5.3 × 10^36 possible values. You would need to generate around a billion UUIDs every second for about 86 years to reach a 50% chance of a single duplicate. Version 7 UUIDs also include the time, so duplicates could only happen within the same millisecond, and this generator keeps them strictly increasing even then.
Frequently asked questions
Is this UUID generator free and secure?
Yes. It is free and uses crypto.getRandomValues, the browser's cryptographically secure random number generator. UUIDs are created on your device and never sent anywhere.
What is the difference between a UUID and a GUID?
Nothing important — GUID is Microsoft's name for the same 128-bit identifier. Windows tools often show GUIDs in upper case and inside braces, which you can choose here.
Should I use UUID v4 or v7 for a database primary key?
v7 is usually better: because it starts with the time, new rows are added at the end of the index instead of at random places, which keeps inserts fast. Use v4 when the creation time must stay private.
Are UUIDs case-sensitive?
No. The standard says to output lower case and accept either case when reading. Choose UPPER CASE only if a system requires it.
How many UUIDs can I generate at once?
Up to 1,000 per click; click Generate again for more. Download them as a text file or copy them as a JSON array for code.
Can I find out when a UUID was created?
For version 1, 6 and 7 UUIDs, yes — paste it into the checker to see the timestamp. Version 4 UUIDs are purely random and contain no time.
Is a UUID safe to use as a secret token?
A v4 UUID is unguessable in practice and fine for many links and IDs. For passwords or API secrets prefer a longer random value — see the Password Generator. Never use v1 or v7 UUIDs as secrets, because part of them is predictable.