Base64 Encoder / Decoder Online
Paste plain text or a Base64 string — the tool instantly encodes or decodes your data. Supports Cyrillic, emoji, and any Unicode characters.
Frequently asked questions
What is Base64 and where is it used?
Base64 is a way to encode binary data as text using 64 characters (A-Z, a-z, 0-9, +, /). It is used in email attachments, JWT tokens, data URIs for images, HTTP Basic Auth, and for passing binary data inside JSON.
Does Base64 work with non-Latin text like Cyrillic?
Yes, but the native btoa() function in JavaScript does not support Cyrillic characters directly. This tool uses TextEncoder to handle UTF-8 correctly, so Cyrillic, Chinese characters, and emoji all work without issues.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode a Base64 string — no key is required. If you need to protect data, use real encryption such as AES or RSA.
Why does a Base64 string end with "=" or "=="?
The "=" characters are padding. Base64 encodes data in groups of 3 bytes into 4 characters. When the input length is not a multiple of 3, one or two "=" padding characters are appended to align the output.
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