Base64 Encode / Decode help

Turn text or a file into Base64 and back. Unicode-safe, with a URL-safe option. Nothing is uploaded.

Text

1. Type in the left box to encode; type in the right box to decode. The two stay in sync.
2. Tick URL-safe to use - and _ and drop the = padding.

File

1. Drop a file to get its Base64. Copy it, or save it as a .txt.
2. Paste Base64 into the lower box, give it a filename, and Save file to turn it back into bytes.

Notes

• Text is treated as UTF-8, so any language and emoji round-trip.
• Decoding bytes that are not valid UTF-8 text is reported; use file mode to save them instead.
• Whitespace and missing padding in pasted Base64 are tolerated.

Everything runs in your browser. Nothing you enter or drop is uploaded.