Online UUID Converter
Convert UUID/GUID between canonical, compact (no hyphens), braced, URN, uppercase/lowercase, and Base64/Base64URL. Supports multiple values and one-click copy.
- Online UUID Generator v4 (RFC 4122) — Bulk, Copy, Multiple Formats
- Base64 Format Checker (Base64/Base64URL Validator)
- Base64 Checker Online (Validate, Decode, Encode)
- XML Formatter Online (Pretty Print, Minify & Validate)
- XML Formatter for VS Code (Pretty, Minify, Validate)
- XML Formatter for Notepad++ (Pretty Print, Minify, Validate)
How to use
Choose an output format, paste your value(s), then convert.
- 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.
- Select the output format (or enable “Show all formats”).
- Click Convert, then Copy if needed.
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.
Continue your workflow
Browse related tools by task. Use the improved core tools for a consistent workspace with file import, downloads and clear validation errors.