PDF to Base64 Converter

How to Convert a PDF to Base64

1. Drop your PDF onto the tool, or click Choose File. The file name, size and last-modified date appear.
2. Pick an Output Format. Data URL (data:application/pdf;base64,...) is the default. Raw Base64 gives just the encoded string.
3. Pick Line Wrapping. No wrapping (single line) is the default. You can also wrap at 64, 76 or 100 characters.
4. Click Convert to Base64. The string appears in the output box with its length and the approximate size increase.
5. Copy it. Use Copy to Clipboard, or Download as .txt to save it as a file ending in _base64.txt.
6. Test it. Decode & Download PDF turns the string back into a PDF so you can confirm it opens.

Why Use This PDF to Base64 Converter

• Your file stays on your device. The PDF is encoded by code running in your browser. Nothing is sent to a server.
• Two output styles. A raw Base64 string for API requests and JSON fields, or a ready-to-use data URL for HTML and CSS.
• Optional line wrapping. Wrap at 64, 76 or 100 characters for systems that expect line-broken Base64, such as email-style text.
• Built-in round trip. One click decodes the string back to a PDF, so you know the output is intact before you paste it somewhere.

Good to know: Base64 text is about a third larger than the PDF, and the tool shows the exact figure. Very large PDFs make a very long string that can slow down the page. If you plan to use a data URL in code, keep Line Wrapping on No wrapping, because line breaks inside a data URL break it. To turn a string back into a file, use Base64 to PDF.

FAQ

How do I convert a PDF to Base64?

Drop your PDF onto the tool, choose an output format and line wrapping, then click Convert to Base64. Copy the result or save it as a .txt file.

What is the difference between Raw Base64 and Data URL?

Raw Base64 is only the encoded characters. A data URL adds the prefix data:application/pdf;base64, so a browser can use it directly, for example as an embed or link target.

Why is the Base64 text bigger than my PDF?

Base64 turns every 3 bytes into 4 characters, so the text is roughly 33 percent larger than the file. The tool shows the exact increase for your PDF.

Should I use line wrapping?

Only if the system you are sending it to needs line-broken text. For JSON fields, API calls and data URLs, keep No wrapping (single line).

Is my PDF uploaded anywhere?

No. The encoding is processed in your browser, so the PDF never leaves your device.

Is there a file size limit?

Your file size limit is shown on this page, and a free account raises it.