XML Name Token and Identifier Base64: .

XML Base64 variants

Published ১২ অক্টোবর, ২০২৬

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This standards reference on Base64Encoding explains xml in plain language for developers and everyday users.

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Some XML schemas need opaque binary identifiers that remain valid as NMTOKEN or Name values. Instead of + and /, they swap the last two Base64 alphabet characters:

Variant	Chars 62 / 63	Padding	Typical use
XML name token	`.` `-`	none	`NMTOKEN` / `NMTOKENS` attributes
XML identifier	`_` `:`	none	XML `Name` / ID-like values

Both omit padding. They are rare compared with RFC 4648 and Base64URL, but appear in niche enterprise XML and legacy interoperability specs.

How to work with them here

Paste a suspicious value into the Base64 standard detector.
Convert to standard Base64 with normalization.
Or decode directly on Base64 decode after selecting the matching XML standard.

If your value contains - and _ only, it is more often Base64URL (JWT, OAuth) than an XML variant.

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What is the fastest way to try xml?

Open the homepage Base64 converter or the related tools linked on this page and paste a sample.

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