How to Convert Base64 to PDF Online
Paste your Base64-encoded PDF data into the box above and click
Decode & Preview PDF. The string is decoded into binary data
directly in your browser and assembled into a PDF Blob. An inline
preview appears so you can verify the document, and a
Download PDF button lets you save it to your device.
If your Base64 string includes a data URI prefix such as
data:application/pdf;base64,, it's automatically stripped before
decoding - you don't need to remove it manually.
Common Use Cases
Base64-encoded PDFs often appear in API responses (e.g. invoice generation services), email attachments, and database fields where binary storage isn't convenient. This tool helps developers and testers quickly inspect such payloads without writing code.
Frequently Asked Questions
This usually means the Base64 string is incomplete or doesn't represent valid PDF data (valid PDFs start with the bytes %PDF-). Double-check that the full string was copied without truncation or extra characters.
Yes. Once decoded successfully, an inline preview appears directly on the page using your browser's built-in PDF viewer, and a download button lets you save the file.
No - but it's fine if it's there. This tool automatically detects and strips the data URI prefix before decoding.
No. The string is decoded entirely in your browser into a local file object. Nothing is transmitted to a server or stored.