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Encode Files for Transmission

When you need to transmit a PDF file inside a JSON payload, XML, or embed it directly into HTML, Base64 encoding is the standard solution. Our PDF to Base64 Converter provides a free and online utility to transform your binary PDF documents into a text-based string. PDFFans handles the encoding process instantly in your browser, generating a clean Base64 string that you can copy and use in your development projects immediately.

How to Convert PDF to Base64:

Why Encode to Base64?

FAQ: Base64 and PDF Encoding

Q: Why does the file size increase with Base64?

A: Base64 encoding typically increases the data size by about 33% because it represents binary data using a limited set of text characters.

Q: Can I encode password-protected PDFs?

A: Yes, the tool encodes the file binary as-is. The resulting string will still represent the locked PDF.

Q: Is the string compatible with all programming languages?

A: Yes. Base64 is a universal standard supported by Python, Java, JavaScript, PHP, and almost all modern languages.