Skip to content
ALL DEVELOPER TOOLS56
JSON FormatterTXT → JSONJSON to CSVJSON → CSVCSV to JSONCSV → JSONSQL FormatterSQL → SQLMarkdown to HTMLMD → HTMLHTML to MarkdownHTML → MDXML FormatterXML → XMLBase64 Encode/DecodeTXT → B64URL Encode/DecodeTXT → URLJWT DecoderJWT → JSONHTML Entity Encode/DecodeTXT → HTMLUUID Generator— → UUIDPassword Generator— → TXTHash GeneratorTXT → HASHLorem Ipsum Generator— → TXTQR Code GeneratorTXT → PNGColor Picker & Converter— → HEXCSS Gradient Generator— → CSSBox Shadow Generator— → CSSRegex TesterTXT → MATCHCron Expression GeneratorTXT → CRONTimestamp ConverterNUM → DATEText DiffTXT → DIFFText Case ConverterTXT → TXTWord CounterTXT → STATSSubtitle ConverterSUBS → SRT · VTT · ASSYAML to JSONYAML → JSONJSON to YAMLJSON → YAMLYAML FormatterYAML → YAMLJSON MinifyJSON → JSONSort & Dedupe LinesTXT → TXTLine Ending ConverterTXT → CRLF · LF · CRXLSX to CSVXLSX → CSVCharset ConverterTEXT → UTF-8HAR ViewerHAR → TABLE · HARJWT EncoderJSON → JWTHMAC GeneratorTXT → MACFile ChecksumFILE → VERDICTWi-Fi QR Code Generator— → QRChmod CalculatorOCTAL → RWXHTTP Status CodesCODE → MEANINGByte ConverterSIZE → UNITSTime Zone ConverterTIME → ZONESAspect Ratio CalculatorSIZE → RATIOURL ParserURL → PARTSExtract ArchiveARCHIVE → FILES · ZIPCreate ZIPFILES → ZIPUnzip FilesZIP → FILESDOCX to MarkdownDOCX → MDSVG OptimizerSVG → SVGBarcode Generator— → BARCODEQR Code ReaderIMG → TEXTVCF to CSVVCF → CSVICS to CSVICS → CSVCSV to Markdown TableCSV → MDBcrypt Generator— → HASH
ENGINE CRYPTOACCEPTS NONE

UUID Generator

CRYPTOTOOL 62 OF 190

UUID Generator — v4 & v7, Bulk Generate

Generate random (v4) or time-based (v7) UUIDs — up to 100 at a time.

ENGINECRYPTO
ACCEPTSNONE
MAX SIZENONE
UPLOADNEVER
01Choose UUID v4 or v7 and how many to generate.
02Click Generate to create the IDs.
03Copy any individual UUID or all of them at once.

About UUID Generator

UUIDs (Universally Unique Identifiers) are 128-bit identifiers used as database primary keys, request IDs, session tokens, and unique resource identifiers across distributed systems. This tool generates two versions of UUIDs. UUID v4 uses cryptographically secure random numbers from the Web Crypto API, making each ID statistically unique without any coordination between systems — the standard choice for most use cases. UUID v7 is time-ordered, embedding a millisecond-precision timestamp in the first 48 bits, which makes it ideal for database primary keys because it maintains chronological ordering and improves index performance compared to random v4 UUIDs. Generate one UUID at a time for quick use, or bulk generate up to 100 for seeding databases, creating test fixtures, or preparing batch operations. Copy individual UUIDs with a single click or copy the entire list at once. The generated UUIDs follow the RFC 4122 and RFC 9562 specifications.

Questions

What's the difference between UUID v4 and v7?

UUID v4 is fully random. UUID v7 is time-ordered — the first 48 bits encode a millisecond timestamp, making it ideal for database primary keys because it preserves insertion order and improves index performance.

Are the UUIDs cryptographically random?

Yes. Both versions use the Web Crypto API (crypto.getRandomValues) for their random components.

Are collisions a real concern?

Practically, no. UUID v4 has 122 bits of randomness — you would need to generate roughly a billion UUIDs per second for a hundred years before a single collision becomes likely. Treat them as unique.

Do v7 UUIDs leak when they were created?

Yes — anyone who sees a v7 UUID can read its creation time back out to the millisecond, since the timestamp sits in plain sight at the front. That's harmless in most databases but worth knowing before putting them in public URLs; use v4 there if creation time is sensitive.

How many UUIDs can I generate at once?

Pick a batch of 1, 5, 10, 25, 50, or 100 per generate. Copy any single UUID with a click, or use Copy all to get the whole batch as one newline-separated list.

Is my file uploaded to a server?

No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.

Related

Password GeneratorGenerate cryptographically strong passwords with custom length and character sets. Powered by Web Crypto — never sent over the network.— → TXTHash GeneratorGenerate SHA-1, SHA-256, SHA-512, and MD5 hashes from text or files. Use for integrity checks, fingerprints, and quick deduplication.TXT → HASHLorem Ipsum GeneratorGenerate Lorem Ipsum placeholder text by paragraphs, sentences, or words. Adjustable length for design mockups, layouts, and content prototypes.— → TXTTimestamp ConverterConvert between Unix timestamps in seconds or milliseconds, ISO 8601, and human-readable dates — edit any of the four fields and the rest follow.NUM → DATE