How are Unicode/UTF-8 characters encoded to Base64?

The encoder converts Unicode characters into raw UTF-8 byte streams using TextEncoder before running the binary-to-ascii btoa() conversion.

Is there a file size limit for Base64 encoding?

For performance and stability, we recommend files under 10MB to prevent browser thread freeze during the string representation process.

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Convert plain text strings or uploaded files to Base64 formats, or convert Base64 sequences back into readable data.

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Plain Text Input

Base64 Result

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Convert strings or binary files to raw Base64 structures:

Choose either **Text Mode** or **File Mode** using the top tab bar.
For text: Input your characters, and trigger **Encode** or **Decode**.
For files: Drag and drop your image, PDF, or document assets directly into the dashed upload panel.
The encoder automatically computes the Base64 stream, keeping outputs aligned inside the dark copyable text editor.

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