No registration, no tracking of your content, no server uploads. Don't just take our word for it:
Your files and text are processed entirely on your device. Nothing is ever sent to us.
Once loaded, this tool keeps working with your Wi-Fi turned off. Try it.
Open your browser's DevTools → Network tab. You'll see zero requests carrying your data.
Discover other powerful utilities designed to supercharge your workflow and boost productivity.
Generate random UUID v4 identifiers instantly — single or bulk up to 1000, in standard, compact, braces, or URN format.
Generate universally unique identifiers with support for different versions and bulk generation.
Encode and decode Base64 strings with support for text, images, and files.
Generate time-ordered UUID v7 identifiers — sortable, index-friendly, and RFC 9562 compliant. Single or bulk up to 1000, 100% in your browser.
No UUIDs generated yet
UUID version 7 is the modern, time-ordered UUID standardized in RFC 9562. Its first 48 bits encode the Unix timestamp in milliseconds, and the remaining bits are random. The result: identifiers that are globally unique like v4, but naturally sortable by creation time.
That time-ordering is a big deal for databases. Random v4 keys scatter inserts across a B-tree index, causing page splits and cache misses at scale; v7 keys are monotonically increasing, so new rows append near the end of the index — the same property that made auto-increment integers fast, without giving up distributed generation. This is why UUIDv7 is rapidly becoming the recommended default for new primary keys in PostgreSQL, MySQL, and distributed systems.
This generator creates RFC 9562-compliant v7 UUIDs in your browser using cryptographically random bits for the non-timestamp portion. Generate one or up to 1000 at once — bulk batches are perfect for seeding, and you can verify the ordering yourself: each UUID in a batch sorts after the previous one.
Generating standard UUIDs is incredibly easy with our streamlined interface:
Generate up to 1000 UUIDs instantly using optimized client-side JavaScript calculations.
No data is sent over the network or saved to any external servers. Your UUIDs are generated directly on your machine.
Easily switch between time-based (v1), fully random (v4), and name-based hashed (v5) unique identifiers.
Format identifiers directly the way you need them—standard formats, compact strings, or enclosed in braces for specific coding environments.
Download massive lists of generated keys straight to a .txt file, perfect for database seeding.
Utilizes the standard RFC 4122 algorithms, ensuring an astronomically low, practically impossible chance of a collision.
Choosing the correct UUID version can significantly affect optimization and reproducibility. Here's a brief summary to help you pick correctly:
Generates identifiers utilizing the host machine's MAC address combined with a high-precision timestamp. This is excellent for ensuring guaranteed uncollision across localized networks and makes tracing back the generator machine possible.
Relies completely on pseudo-random numbers. Out of the 128 available bits, 122 are strictly random, providing vast cryptographic complexity. It requires no knowledge of the generating server, making it inherently safer and preventing node identification.
Needs two parameters: a namespace identifier and a raw string name. By applying a SHA-1 hash to these variables, you receive an identical, reproducible UUID anytime you provide the exact same namespace and string sequence inputs. Very popular in deterministic systems.
Standardized in RFC 9562, it embeds a 48-bit Unix millisecond timestamp followed by random bits. The result sorts naturally by creation time, making it the recommended choice for database primary keys — sequential index inserts with the distributed uniqueness of a UUID.
UUIDv7 (RFC 9562) packs a 48-bit Unix millisecond timestamp into the first 6 bytes, followed by the version nibble (7), and fills the rest with random bits plus the standard variant marker. Lexicographic order therefore matches creation order at millisecond resolution.
Because v7 values increase over time, inserts land near the end of the index instead of at random positions. That means fewer B-tree page splits, better cache locality, and faster writes at scale — while keeping the collision-free distributed generation UUIDs are loved for.
Yes — the first 12 hex characters (ignoring the hyphen) are the millisecond Unix timestamp. That's a feature for debugging and log correlation, but consider it a privacy trade-off: unlike v4, a v7 UUID reveals when it was created.
Any database that stores UUIDs can store v7 — it's a standard 128-bit UUID. PostgreSQL 18+ generates them natively (uuidv7()), and libraries exist for every major language. Sorting and indexing benefits apply everywhere.
Both are time-ordered 128-bit identifiers. ULID predates v7 and uses Crockford base32 text encoding; UUIDv7 is the IETF-standardized approach that fits existing UUID columns, tooling, and APIs unchanged. For new systems, v7 is generally the safer, standard choice.
Construct complex secure identifiers reliably for all of your developer requirements. Ready out of the box with standard formats and unlimited bulk execution.