Base64 Encoder & Decoder
Encode text, images, and files to Base64 — or decode any Base64 string — all in your browser with zero uploads.
// FAQ
What is Base64 encoding?
Base64 is a way of representing binary data as ASCII text using 64 printable characters. It's widely used to embed images in HTML/CSS, transmit binary data in JSON, and carry credentials in HTTP headers.
What's the difference between Base64 and Base64URL?
Standard Base64 uses + and / characters. Base64URL is a URL-safe variant that replaces + with - and / with _ (and often omits padding =), so the output is safe to put in URLs and JWTs.
Does my data get uploaded anywhere?
No. All encoding and decoding runs entirely in your browser. Text, images, and files you paste or drop here never leave your tab.
Why is Base64 output larger than the input?
Base64 represents every 3 input bytes as 4 output characters, so the output is roughly 4/3 of the input — about 33% larger. That overhead is the trade-off for ASCII-safe transport.
Building an API or system that handles binary data?
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