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UUID Converter Online

Convert a UUID between hyphenated, plain, URN and Base64 forms, and back again, when one system emits a shape another will not accept.

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UUIDs

Paste one UUID or a list. Accepted: canonical (with hyphens), compact 32 hex digits, {braces} and urn:uuid: forms, in either case.

Output form

Example: 123e4567-e89b-42d3-a456-426614174000

About UUID Converter

The same identifier gets written several ways — hyphenated, bare hex, wrapped in braces, as a URN, Base64-encoded — and systems disagree about which they accept. This converts between the forms without you counting hyphens by hand. Free to use online with nothing to join. The conversion happens in this page, so no identifier is uploaded.

How to use UUID Converter

  1. Paste the value in whatever form you haveThe input form is detected rather than selected.
  2. Read the alternativesEvery representation of the same identifier, side by side.
  3. Copy the form the other system wantsEvery representation has its own copy control. Editing hyphens out of a 36-character string by hand is how the wrong identifier reaches production.

Why so many forms exist

The canonical text form is 36 characters with hyphens. Microsoft tooling has long wrapped it in braces. The URN form prefixes urn:uuid: and is what appears in XML and RDF. Base64 and raw 16-byte forms exist because 36 characters is wasteful when you are storing millions of them. They are all the same 128 bits arranged differently.

What it does not do

  • Converting does not change the identifier or its version — it is the same value in different clothes.
  • Byte-order matters for the binary forms. A value round-tripped through a system that stores UUIDs with swapped byte groups will not match, and that is a property of the other system rather than of the conversion.

UUID Converter: questions people ask

Does converting change the UUID?
No. Every form encodes the same 128 bits, so converting and converting back returns exactly what you started with.
Why does my database show a different value?
Some systems store UUIDs in a byte order that differs from the text form, and some display the raw bytes rather than the canonical string. That is a storage convention on their side, not a different identifier.
Can the UUID converter show the timestamp inside a v1 or v7 UUID?
No, this page only rewrites a UUID into another form such as compact hex, braces, URN or Base64. The UUID Validator reads the embedded time from version 1, 6 and 7 identifiers and shows it in UTC and local time. Version 4 values are random, so they carry no time at all.

Questions about ToolsVerse itself — privacy, cost, what happens to your files — are answered in the frequently asked questions.

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