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PDF to Base64 Encoder

Convert a PDF to a Base64 string in your browser. Useful for embedding PDFs in JSON or email APIs.

PDF to Base64 encodes any PDF file into a Base64 string for use in JSON APIs, email attachments, or data URIs. ConvertDa's free PDF to Base64 tool runs in your browser — your file never uploads. Copy the result or download as a text file.

How to pdf → base64

  1. 1

    Drop your PDF into the upload area.

  2. 2

    The Base64 string appears below.

  3. 3

    Copy or download as text.

Frequently asked questions

Why would I encode a PDF as Base64?▾

Common reasons: embedding in JSON payloads, sending via APIs that require text, or building data URIs for inline preview.

Why would I Base64-encode a PDF?▾

Common reasons: embedding a PDF inside a JSON API request, sending a PDF inline in an email body, or generating a data URI for a download link in HTML or JavaScript.

Is the data URI prefix optional?▾

Yes. With the prefix (data:application/pdf;base64,...), the string can be used directly as a downloadable link. Without it, you get just the encoded bytes.

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