How to use Base64 Encoder & Decoder

Encode UTF-8 text as Base64 or decode Base64 back to text.

1. Paste, type, or drag and drop a supported text file into the input area.
2. Choose the options that match your intended result.
3. Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.

What the result means

Encoded Base64 or decoded UTF-8 text.

Privacy and safety

This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.

Limitations

• Decoding expects the bytes to represent valid UTF-8 text; use a file converter for arbitrary binary data.

Try the included example

Select “Load example” at any time to restore this tested sample.

Hello, Світ 👋