Base64 to PDF Converter (Decode & Download)

Decode a Base64 string back into a PDF file online — paste the Base64 or a data: URI, verify it and download the .pdf. Free, no upload.

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How it works

The input is stripped of any data:application/pdf;base64, prefix and whitespace, validated against the Base64 alphabet, then decoded to raw bytes. A valid PDF always starts with the five bytes %PDF, so the tool checks that signature before offering the decoded file as a download.

Examples

InputOutput
JVBERi0xLjQ...decodes to a %PDF file
data:application/pdf;base64,JVBERi0x...prefix auto-stripped, same result
aGVsbG8=decodes fine but warns: not a PDF

Frequently Asked Questions

Where does Base64 PDF data come from?

APIs that return documents as JSON, email attachments in raw message source, database exports and embed code all commonly carry PDFs as Base64 text instead of binary files.

Is decoding Base64 safe?

Decoding itself is harmless — it is just bytes. The usual caution applies when opening the resulting PDF: only open files from sources you trust, as with any downloaded document.

Why does my paste fail validation?

The most common causes are copying only part of a long string, leaving the data:...prefix half-selected, or smart quotes sneaking in from a word processor. Paste the raw string exactly as exported.

Does my data get uploaded?

No. Decoding happens entirely in your browser and the download is created locally with a Blob URL — nothing leaves your device.

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