Base64 Encode

Encodes any text you provide into its Base64 representation using the browser's built-in text encoder, so raw bytes — including full Unicode text, not just ASCII — are converted into the standard A–Z, a–z, 0–9, +, /, and = alphabet.

Type or paste text into the input box; the Base64 output updates automatically below it. Copy the result with the copy button — there is no separate "encode" button to press.

Encoding `Hello, World!` produces `SGVsbG8sIFdvcmxkIQ==`. The trailing `==` padding appears because the input's byte length isn't a multiple of three, which is how standard Base64 always pads shorter inputs.

The text is first converted to UTF-8 bytes before encoding, so multi-byte characters such as emoji or accented letters are handled correctly and round-trip losslessly through the matching Base64 Decode tool — unlike a naive `btoa()` call, which throws on any character outside the Latin-1 range.

Base64 text commonly appears in JSON payloads, HTTP `Authorization` headers, data URIs for small images, and `.env` configuration values, since those contexts expect plain ASCII rather than arbitrary bytes.

This tool encodes text you type or paste, not files — it does not read from disk. Base64 is a reversible encoding, not encryption or a security measure, and it typically increases size by about a third.

Encoding runs entirely in your browser via client-side JavaScript; the text you enter is never uploaded to a server or stored.