UUID Generator

UUID v4 uses cryptographically random bits — collision probability is negligible even at billions of IDs. UUID v7 embeds a millisecond timestamp in the first 48 bits, making it sortable by creation time — ideal for databases that use UUIDs as primary keys (K-Sortable). UUID v1 uses a timestamp + MAC address — sortable but exposes your hardware ID and is generally not recommended. v4 is the most common; v7 is the modern choice for sortable IDs.

No. All generation happens in your browser using JavaScript. The history feature uses sessionStorage, which is cleared when you close the tab. No UUIDs are ever sent to any server.

Up to 1,000 UUIDs in a single click. Bulk generation runs synchronously — for very large batches (500+), the browser may briefly freeze. A progress indicator shows generation status.

Case: lowercase (a1b2c3d4...) or uppercase (A1B2C3D4...). Hyphens: standard (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx) or compact (no hyphens). Braces: optional curly braces around the UUID (format shown in the output). These can be combined in any combination.

UUID v7 (RFC 9562) encodes a Unix timestamp in the first 48 bits, followed by random bits. This means v7 UUIDs sort chronologically by generation time — useful for databases that use UUIDs as primary keys (K-Sortable). It also avoids the entropy leakage of v1 (no MAC address exposure) while being harder to guess than v4.