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Base64 to PDF Decoder

Decode a Base64 string and download a PDF file. Browser-based, fully private.

Length: 0 characters

Leave as-is unless you know the original file type. Data URIs auto-detect.

Base64 to PDF decodes a Base64 string back into a PDF file you can download. ConvertDa's free Base64 to PDF tool runs entirely in your browser — paste the string, click decode, and the PDF downloads. Works with or without the data URI prefix.

How to base64 → pdf

  1. 1

    Paste your Base64 string.

  2. 2

    Click Decode & Download.

  3. 3

    Get the PDF file in your downloads.

Frequently asked questions

Can I decode a data URI?▾

Yes. Inputs starting with data:application/pdf;base64, are auto-detected.

What if my decoded file won't open as a PDF?▾

Check that the original encoded data was actually a PDF — Base64 will decode anything to bytes regardless of file type. The PDF magic bytes start with %PDF-; if they don't, the source isn't a PDF.

Are there size limits?▾

Limited only by browser memory. Strings up to ~100 MB decode reliably; larger may slow your browser.

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