Building a Base64 Encoder/Decoder with File...

Base64 is everywhere — data URLs, email attachments, API payloads, JWTs. But the browser's built-in btoa() and atob() have a well-known limitation: they choke on Unicode. I built a Base64 tool that handles UTF-8 text, file uploads, and binary downloads — all client-side. Here's how it works. The live tool is at ultimatetools.io/tools/coding-tools/base64-encoder-decoder/. The UTF-8 problem with btoa btoa() only accepts characters in the Latin-1 range (U+0000 to U+00FF). Try encoding anything outs