Does this upload my PDF anywhere?

No. Decoding, validation, and the preview all happen locally in your browser — the file is never sent to a server.

What if the decoded data isn't a PDF?

You'll get a clear error rather than a broken preview — the tool checks that the decoded bytes start with the standard PDF file signature.

Does it work with a full data: URI, not just raw Base64?

Yes — a data:application/pdf;base64,... prefix is detected and stripped automatically.

Base64 to PDF

Runs locally

Paste a Base64-encoded PDF (with or without a data: URI prefix) to decode it, preview it right here, and download the original file — all in your browser.

Base64 (with or without a data: URI prefix)

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Your data is processed locally in your browser and is not uploaded.

Learn more about this tool⌄

How it works

The Base64 is decoded to raw bytes locally, checked for the PDF file signature (%PDF-), then shown in an inline preview and made available to download. Nothing is uploaded to a server.

Common use cases

Recovering a PDF from a Base64 string found in an API response or database field
Previewing a Base64-encoded PDF attachment from an email or webhook payload
Verifying a Base64 blob is actually a valid PDF before using it elsewhere

Frequently asked questions

Does this upload my PDF anywhere?: No. Decoding, validation, and the preview all happen locally in your browser — the file is never sent to a server.
What if the decoded data isn't a PDF?: You'll get a clear error rather than a broken preview — the tool checks that the decoded bytes start with the standard PDF file signature.
Does it work with a full data: URI, not just raw Base64?: Yes — a data:application/pdf;base64,... prefix is detected and stripped automatically.