Why UUID v7 Is the 2026 Default for Database Primary Keys

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A developer building a demo environment needed 8,500 UUIDs quickly and found that existing online generators were limited, ad-heavy, or lacked UUID v7 support. UUID v4 uses 122 random bits, causing scattered B-tree inserts that hurt database index performance at scale. UUID v7, standardized in RFC 9562 in May 2024, embeds a 48-bit millisecond timestamp at the front, ensuring new keys sort chronologically and inserts append sequentially. Postgres 18 added a native uuidv7() function in September 2025, further cementing v7 as a practical default. The author built a free, client-side bulk UUID generator supporting both v4 and v7, with no data leaving the user's browser.

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