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Base64 Encoder / Decoder
Encode or decode Base64 instantly. Runs entirely in your browser.
Output will appear hereEncode or decode Base64 instantly. Runs entirely in your browser.
Output will appear hereBase64 turns binary data into plain text using 64 safe characters, so it can travel through systems that only handle text — email bodies, JSON payloads, data URIs, and HTTP headers. This tool encodes and decodes it entirely in your browser.
What is Base64 encoding used for?
Base64 lets binary data pass through text-only channels. Common uses are embedding images directly in HTML or CSS as data URIs, attaching files to emails, putting binary values inside JSON, and encoding credentials in HTTP Basic Auth headers.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode it instantly — this tool does it in one click. Never use Base64 to protect passwords, tokens, or personal data; use real encryption for that.
Why does Base64 make data bigger?
Base64 represents every 3 bytes as 4 characters, so encoded output is roughly 33% larger than the original. That is the cost of making binary data safe to transmit as text.
What do the equals signs at the end mean?
They are padding. Base64 works in blocks of three bytes; when the input does not divide evenly, one or two = characters pad the final block. A valid Base64 string is always a multiple of four characters long.
Does my data get uploaded anywhere?
No. Encoding and decoding both run in your browser using its built-in functions. Nothing you paste is sent to a server, logged, or stored — you can disconnect from the internet and the tool still works.
Does it handle emoji and non-English text?
Yes. Text is converted to UTF-8 before encoding, so accented characters, emoji, and non-Latin scripts all round-trip correctly.
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