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Online UUID Converter

Paste a UUID/GUID (or a 16-byte Base64/Base64URL token) and convert it into common formats: canonical with hyphens, compact 32-hex, braced, URN, and Base64 variants. Works with multiple values at once.

Category: Developer · URL: /tools/online-uuid-converter.html
Tip: You can paste a whole chunk of text—UUIDs inside it will be extracted and converted.
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Choose an output format, paste your value(s), then convert.

  1. Paste one or more UUID/GUID values (any mix of canonical, compact, braced, or URN). You can also paste Base64/Base64URL that decodes to 16 bytes.
  2. Select the output format (or enable “Show all formats”).
  3. Click Convert, then Copy if needed.
Keywords this page targets (natural cluster): online uuid converter, uuid format converter, guid converter online, convert guid to uuid, uuid to compact, uuid without hyphens, compact uuid to canonical, uuid to urn, urn uuid to uuid, uuid to base64, base64 to uuid, uuid to base64url, base64url to uuid, uuid to braces, braced guid to uuid, uppercase uuid converter, lowercase guid converter, bulk uuid converter, rfc 4122 uuid converter
Secondary intents covered: Normalize mixed UUID/GUID inputs into one consistent format, Remove hyphens (canonical to compact) for storage/keys, Add braces or URN prefix for specific APIs and config files, Convert UUID bytes in Base64/Base64URL to canonical UUID, Bulk-convert UUIDs copied from logs or CSV data, Quickly change casing (lower/upper) without breaking validity, Verify basic UUID version/variant from the parsed value, Generate copy-ready strings for code snippets (C#/Java)

FAQ

What UUID/GUID formats can I paste?

Canonical with hyphens, compact 32-hex, braced {…}, and URN (urn:uuid:…) are supported, in any casing.

Can this convert Base64 or Base64URL into a UUID?

Yes—if it decodes to exactly 16 bytes, it will be treated as a UUID and converted to your chosen format.

How is Base64 output computed?

It’s Base64 of the raw 16 UUID bytes in network order; Base64URL replaces +/ with -_ and removes padding.

Can I convert multiple UUIDs at once?

Yes—paste multiple values (or a blob of text). The tool extracts UUIDs and converts them line by line.

Does it validate UUID version and variant?

It validates the hex structure; with “Show all formats” enabled it also reports the parsed version and variant.

Why does my input show “not found” or fail to convert?

The tool only accepts valid UUID/GUID shapes (32 hex chars) or Base64/Base64URL that decodes to 16 bytes.

Is anything sent to a server?

No—conversion runs entirely in your browser and the script does not make network requests.