PDF to Base64 Converter
Many APIs - e-signature, e-invoicing, document storage, e-mail services - expect PDF files as Base64 inside JSON. Drop your PDF here and copy the Base64 string or a data:application/pdf data URI. Because the conversion runs in your browser, confidential contracts stay on your computer.
How to use the PDF to Base64 tool
- Drop the PDF on the box or click to choose it.
- Choose raw Base64 (most APIs) or a data URI.
- Copy the result or download it as a text file.
Questions and answers
How do I check that the Base64 is a valid PDF?
Raw Base64 of a PDF always starts with JVBERi0 (which is "%PDF-"). Paste it into Base64 to PDF to preview it.
Can I convert several PDFs at once?
Yes. Choose several files and pick the JSON output to get all of them with their names.
Is there a size limit?
No fixed limit. Very large PDFs (hundreds of MB) depend on your computer's memory.
Is my data uploaded to a server?
No. Every conversion on this page runs inside your browser with JavaScript. Your text and files never leave your computer, which is why it also works for private keys, contracts and photos.
Is the tool free?
Yes, free without sign-up and without limits other than your computer's memory. The site is paid for by the small ads on the left and at the bottom.