Base64 to PDF Converter Online
Decode Base64-encoded strings into downloadable PDF files. 100% private, client-side decoding with zero server uploads.
How to Convert Base64 to PDF
Paste your Base64 string or upload a text file containing the payload.
Click “Convert Base64 to PDF” to decode the bytes and check the PDF header.
Download the PDF or open it in a new tab to check it first.
How Base64 PDF Decoding Works
APIs, emails and databases often store PDFs as Base64 text so they can travel safely inside JSON or XML. This tool turns that text back into the original binary file.
Decoding happens inside your browser. Working with spreadsheets instead? Use the Base64 to Excel Converter, or go the other direction with the Excel to Base64 Converter.
Automatic PDF Signature Check
Every valid PDF begins with the marker %PDF- followed by a version number, such as %PDF-1.7.
- Header found: the file is named .pdf and the PDF version is shown.
- Header missing: you get a clear error instead of a broken download.
- Quick tip: Base64 PDFs usually start with
JVBERi0.
Troubleshooting Common Base64 PDF Errors
| Issue | Likely Cause | Solution |
|---|---|---|
| Invalid Base64 | Truncated string or non-Base64 characters | Copy the entire payload again. |
| Data URL header | Includes data:application/pdf;base64, | Keep the cleanup option checked. |
| No %PDF header | The data is an image, DOCX or spreadsheet | For spreadsheets use the Base64 to Excel Converter. |
Frequently Asked Questions
Is my Base64 data uploaded to any server?
No. Decoding runs entirely in your browser. Your data never leaves your device.
How can I tell if my Base64 string is a PDF?
Base64-encoded PDFs almost always start with JVBERi0, which is the encoded form of %PDF-.
Does it work with data URLs?
Yes. A prefix such as data:application/pdf;base64, is removed automatically when the cleanup option is on.
Why does my PDF fail to open?
The string is probably cut off or edited. Copy the complete payload again from the source.