01. Eliminates B-Tree Index Fragmentation
Random UUIDv4 causes expensive random disk I/O because inserts occur randomly across index pages. UUIDv7 embeds a 48-bit Unix timestamp in its high bits, guaranteeing naturally ascending sequential inserts.
Developer Tools
UUID / GUID v4 & v7 Bulk Generator
100% Client-Side. Generated locally using Web Crypto API. Zero server transmissions.QuantityGenerate 1 to 10,000 UUIDs instantly
Custom Timestamp (UUIDv7 only)Leave empty for current time, or pick a date to backdate or schedule UUIDv7 IDs.
Generated UUID Output
0 UUIDs generatedRFC 9562 Standard Architecture
Why UUIDv7 is Replacing UUIDv4 for Database Primary Keys
Published in May 2024 by the IETF, RFC 9562 introduces UUIDv7 as the modern replacement for UUIDv4 in relational databases, document stores, and distributed microservices.
02. Sub-Millisecond Time Sortability
Because UUIDv7 sorts chronologically, queries ordered by ID naturally return records in creation order. You can query records newer or older than a given UUID without adding separate timestamp columns.
03. Retains 74 Bits of Cryptographic Entropy
Unlike auto-incrementing integer IDs that expose business volume to scrapers, UUIDv7 provides 74 bits of cryptographically secure random bits, preventing identifier enumeration and guessing.
Frequently Asked Questions
UUID / GUID Generation FAQ
What is the difference between a UUID and a GUID?
UUID (Universally Unique Identifier) is the standard defined by the IETF (RFC 4122 / RFC 9562). GUID (Globally Unique Identifier) is Microsoft’s term for the same 128-bit standard. Today, UUID and GUID refer to the exact same 16-byte identifier format.
Why should I choose UUID v7 over UUID v4?
UUID v4 is completely random, which causes severe B-Tree page splits and cache eviction in databases like PostgreSQL, MySQL, SQLite, and MongoDB. UUID v7 embeds a 48-bit millisecond timestamp in the leading bits, so new IDs append sequentially to the end of the index, boosting database insert speeds by up to 4x while remaining globally unique.
Are UUIDs generated on DevsLoad private and secure?
Yes, 100%. All UUIDs are generated directly in your browser using the window.crypto Web Crypto API. No generated UUIDs, timestamps, or inputs are ever transmitted to or stored on DevsLoad servers.
What is the probability of a UUID collision?
For UUID v4, the collision probability is virtually zero: you would need to generate 1 billion UUIDs every second for 85 years to have a 50% chance of a single collision. UUID v7 has a similarly negligible collision rate, backed by 74 bits of random entropy plus sub-millisecond sequencing.
Can I generate thousands of UUIDs at once?
Yes. DevsLoad allows generating up to 10,000 UUIDs in a single click in fractions of a second, with one-click export to JSON, CSV, SQL INSERT, and programming language arrays.