Keep files modest (a few MB) so the browser stays responsive.

File to Base64 Converter Online — any file to Base64

File to Base64

File to Base64 — drop any supported file and copy Base64 or a Data URI. Encode → File is pre-selected.

How to use File to Base64

“Base 64 encoder file” searches want binary→Base64 without a CLI. This landing is File encode with broad accept.

DOCX, XLSX, and PPTX encode as Base64 like any other binary; decode restores the original extension when magic bytes match.

Buffer.from("hello").toString("base64");
Buffer.from(b64, "base64").toString("utf8");

btoa(unescape(encodeURIComponent(text)));
decodeURIComponent(escape(atob(b64)));

import base64
base64.b64encode(b"hello").decode()  # aGVsbG8=
base64.b64decode("aGVsbG8=").decode()

const uri = `data:image/png;base64,${b64}`;
// <img src={uri} /> or CSS url('${uri}')

This is one direction of Base64 Studio. The editor is the same; the title and default direction match this search.