PDF to Base64 Converter — Encode & Decode, Batch Upload
Drop a PDF and get the Base64 string instantly — or paste Base64 to download the PDF back. Batch upload, Data URI, raw, and MIME formats. 100% client-side — files never leave your browser.
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Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data (like PDF files) into ASCII text. This allows you to embed files directly in HTML, JSON, or other text-based formats.
Why convert a PDF to Base64?
Common uses include embedding PDFs in JSON APIs, storing files in databases as text, sending files via email protocols, or embedding in data URIs for web applications.
Is my file uploaded to a server?
No, all processing happens entirely in your browser using JavaScript. Your PDF never leaves your device, ensuring complete privacy.
Can I decode Base64 back to a PDF?
Yes! Switch to the Decode tab, paste a Base64 string (raw, MIME-wrapped, or Data URL), and download it as a .pdf file instantly.
Can I convert multiple PDFs at once?
Yes, the Encode tab supports batch uploads. Select or drag-drop multiple .pdf files and they will all be converted independently.
What is the HTML Embed format?
The HTML Embed output gives you a ready-to-paste <iframe> tag that displays your PDF inline on a web page using a Base64 Data URL. No server or file hosting needed.
What is MIME line wrapping?
MIME (RFC 2045) wraps Base64 output at 76 characters per line. This format is required by email protocols and some legacy systems.
What's the difference between Data URL and Raw Base64?
A Data URL includes the MIME type prefix (data:application/pdf;base64,...) which browsers understand. Raw Base64 is just the encoded content without the prefix.