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Base64 Encoder / Decoder

Encode one or more files as raw Base64 text, or upload text files containing Base64 data to decode them back to bytes. Base64 is an encoding format, not encryption, and decoded bytes do not inherently contain the original filename or MIME type.

🔒 File processing runs locally in your browserFree to start · No sign-up required

How to Use

1Select Encode or Decode mode
2Upload the file
3Download the resulting .b64.txt (encode) or decoded byte file (decode)

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Why use ShowPro's Base64 Encoder / Decoder?

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Private by Design

File-processing tools keep your files in the browser.

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Instant Results

Processing happens locally — no waiting for uploads.

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Free to Start

No account needed for the free tier. Limits are shown where they apply.

Frequently Asked Questions

What file types can I encode?

Any file type. The output is always a plain .txt file containing the Base64 string.

Is there a file size limit?

Base64 output is roughly one third larger than the source, and the current implementation reads the file into browser memory, so practical limits depend on the device and browser.