Comment utiliser : GUID Generator
- GUIDs are generated as soon as the page opens, in uppercase Microsoft format with braces.
- Set how many you need and the output format — list, comma-separated, JSON array or SQL values.
- Copy them, or switch off braces and uppercase for a plain UUID.
GUID vs UUID
A GUID (globally unique identifier) is Microsoft’s name for a UUID (universally unique identifier). Both are 128-bit values written as 32 hexadecimal digits in five groups, 8-4-4-4-12. Windows tools traditionally show GUIDs in uppercase and wrapped in braces — {6F9619FF-8B86-D011-B42D-00C04FC964FF} — while most other systems use lowercase without braces. The value is the same; only the notation differs.
Using GUIDs in .NET and SQL Server
In C#, Guid.NewGuid() creates a version 4 (random) GUID and Guid.Parse("…") accepts all the formats this tool produces. In SQL Server, GUID columns use the uniqueidentifier type; choose the SQL output to get quoted values ready for an INSERT. Version 7 GUIDs start with a timestamp, so new rows land at the end of an index instead of in random places — useful for primary keys.
Are GUIDs really unique?
Version 4 GUIDs contain 122 random bits from your browser’s cryptographic random generator. You would need to create about a billion GUIDs per second for around 85 years to reach a 50% chance of a single collision, so they are safe to treat as unique.
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Outils complémentaires : GUID Generator
- UUID Generator — Create cryptographically random UUIDs (v4) or sortable, timestamp-based UUIDs (v7) in bulk, then copy or download them.
- Hash Generator — Compute MD5 and SHA hashes of any text or file instantly, create HMAC signatures, and paste an expected checksum to verify a download.
- Générateur de mots de passe — Créez des mots de passe robustes et véritablement aléatoires ou des phrases de passe faciles à saisir, grâce à des règles avancées : incluez ou excluez des mots, imposez des caractères, choisissez les symboles autorisés, évitez les répétitions et les séquences.
- Générateur de nombres aléatoires — Générez des nombres aléatoires (avec ou sans doublons), sélectionnez des gagnants dans une liste, mélangez des noms, répartissez des groupes en équipes, lancez une pièce et lancez des dés — en utilisant la fonction aléatoire cryptographiquement sécurisée de votre navigateur.
Questions fréquentes
What is the difference between a GUID and a UUID?
How do I generate a GUID in C#?
Guid.NewGuid(). To format it with braces, call .ToString("B").ToUpper().