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BEAD

Base64 Encoder / Decoder

Encode or decode Base64 strings instantly.

EncodingDeveloper
Base64

🔒 Encoding runs entirely in your browser.

About Base64

Base64 encodes binary data as ASCII so it survives transports that mangle non-text bytes (email, JSON, URLs). It expands the payload by ~33%, so don't use it for storage when you have alternatives.

UTF-8 mode handles non-ASCII characters correctly. URL-safe mode swaps +/ for -_ and drops padding — used in JWTs and URL fragments.

Frequently asked

▸What's URL-safe Base64?

Standard Base64 uses + and / characters that need percent-encoding in URLs. URL-safe Base64 replaces them with - and _, and usually drops the = padding. Pick the URL-safe variant when the result goes in a URL or JWT.

▸Is Base64 encryption?

No. Base64 is encoding — anyone can decode it instantly. It's used to ship binary data through text channels (email, JSON, URLs), not to hide it. If you need confidentiality, use AES Encrypt instead.

▸How big does the output get?

Base64 expands input by roughly 33% — every 3 bytes of input become 4 characters of output. For very large files this overhead matters; consider compressing first or using a binary-safe transport.

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