How to Base64 Encode or Decode Files on iPhone

Base64 turns binary bytes into text characters. It is useful when a system needs binary data represented in a text-safe form, but it is not encryption and it does not make sensitive data secret.

ShowPro's Base64 Encoder & Decoder at https://showprosoftware.com/tools/base64-encoder-decoder works with files in Safari.

Encode a file to Base64 on iPhone

For each source file, ShowPro creates a file named like:

filename.ext.b64.txt

The output contains the raw Base64 text. It does not add a data-URI prefix such as data:image/png;base64,.

Decode Base64 back to bytes

The current decoder expects a text file containing Base64 data.

Whitespace in the Base64 text is removed before decoding.

If the input filename ends in .b64.txt, ShowPro removes that suffix for the output name. Otherwise it removes a final .txt suffix.

Because Base64 itself does not reliably preserve the original filename or MIME type, keep track of what the decoded bytes represent.

Base64 is not encryption

Anyone who receives valid Base64 text can decode it.

Do not use Base64 as a password-protection or secrecy mechanism.

Its purpose is representation: it converts bytes into a restricted text alphabet that can travel through systems that expect text.

Why Base64 files are larger

Base64 normally expands the raw data size by roughly one third before any surrounding text or formatting.

That makes it convenient for transport in some protocols, but inefficient as a general storage format for large files.

Browser-local processing

ShowPro reads the selected file and performs Base64 conversion in browser JavaScript for this operation.

The selected file is not sent to a ShowPro Base64-processing endpoint.

Normal website networking such as analytics, advertising, billing, and explicitly networked features is separate.

Multiple files

Encode mode accepts multiple files and produces one Base64 text result per source file.

Decode mode can also accept multiple text files and processes each one individually.

What the decoder validates

The tool removes whitespace and uses the browser's Base64 decoder.

If the text is not valid Base64, the conversion stops with an error rather than silently producing a result.

FAQ

Can I paste a Base64 string directly into the current tool?

The current file workflow expects Base64 data in a text file rather than a paste-only text box.

Does Base64 protect private data?

No. It is encoding, not encryption.

Does ShowPro upload the selected file?

The current Base64 conversion operates in browser code rather than a ShowPro conversion endpoint.

Will decoding restore the original filename and type?

Not inherently. Base64 carries bytes, not a guaranteed original filename or MIME type.