ToolFoxBase64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text — Unicode-safe, entirely in your browser.
How it works
Text is first converted to UTF-8 bytes, then those bytes are represented in the 64-character alphabet (A–Z, a–z, 0–9, +, /) with = padding — three bytes become four characters. Decoding validates the input strictly: non-Base64 characters or byte sequences that are not valid UTF-8 produce a clear error instead of garbage.
Example
"hello" encodes to aGVsbG8=. Devanagari works too: नमस्ते round-trips exactly, because encoding operates on UTF-8 bytes rather than raw characters.
Frequently asked questions
Is Base64 encryption?
No — it is a reversible encoding anyone can decode. Never use it to protect secrets.
Why does the output end with =?
Padding aligns the output to 4-character blocks when the byte length is not a multiple of three.
Can I decode data URLs?
Yes — paste the part after base64, (without the data:...;base64, prefix). Binary output that is not text may show replacement characters.
Is my data uploaded?
No — encoding and decoding are local.
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