PDF to Base64

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FAQ

PDF to Base64

Why is the Base64 string bigger than the PDF?

Base64 represents every 3 bytes of binary data with 4 text characters, so the encoded output is about 33% larger than the source file. That overhead is the price of moving a binary file safely through text-only channels.

What is the difference between raw Base64 and a data URI?

Raw Base64 is just the encoded payload — that is what most JSON APIs expect. A data URI prefixes it with data:application/pdf;base64, so a browser can open it directly in an <embed>, an <iframe>, or a download link.

Is there a size limit for encoding a PDF to Base64?

The tool itself does not impose one, but the systems you send the string to usually do. Many APIs cap JSON request bodies at a few megabytes, so a large PDF often needs a file upload endpoint instead of an inline Base64 field.