This standards reference on Base64Encoding explains imap in plain language for developers and everyday users.
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IMAP mailbox names that contain non-ASCII characters use modified UTF-7 (RFC 3501). Inside those names, a Base64-like alphabet encodes Unicode with two important differences from RFC 4648:
Value
Standard Base64
IMAP variant
62
+
+
63
/
,
Padding
= required
none
The / character is replaced with , because / is the IMAP hierarchy separator. Padding is omitted so mailbox names stay compact.
Example
ASCII mailbox names need no encoding. A name with non-ASCII characters embeds &…- segments where … is IMAP Base64 of UTF-16BE bytes.
When developers need this
Debugging mailbox names returned by IMAP servers in Europe (umlauts, accents, Cyrillic).
Migrating mailboxes between providers.
Writing IMAP clients that round-trip international folder names.
Use the standard detector to recognise IMAP Base64, then normalize to standard Base64 or decode with the IMAP standard selected.
Често задавани въпроси
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Yes — use the private feedback form. We prioritize what users ask for across languages.
What is the fastest way to try imap?
Open the homepage Base64 converter or the related tools linked on this page and paste a sample.
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