Free Base64 to PDF Converter Online. Convert PDFs to Base64 strings or decode Base64 to PDFs instantly. Perfect for embedding PDFs in HTML, JSON, or APIs.
Click to upload PDF
PDF files up to 10MB
PDF will be available here after decoding
A Base64 PDF is a PDF file that has been encoded into a text string using Base64 encoding. This allows PDF documents to be embedded directly in HTML, JSON, APIs, or other text-based formats without requiring separate PDF files or external URLs.
Key Benefits:
• Embed PDFs directly in HTML without external files
• Store PDFs in databases as text strings
• Include PDFs in JSON APIs and configuration files
• Send PDFs via email or messaging systems that only support text
• Create self-contained HTML documents with embedded PDFs
Base64 PDFs are commonly used for embedding documents in web applications, storing PDFs in databases, sending PDFs through APIs, and including PDFs in JSON responses. However, Base64 encoding increases file size by approximately 33%, so it's important to consider file size when working with large PDF documents.
Converting PDFs to Base64 and vice versa can be done using various methods. Here are the most common approaches:
Convert PDF to Base64 using FileReader:
Use base64 module to encode/decode PDFs:
Use Base64 PDFs directly in HTML or JSON:
Our PDF Base64 encoder and decoder tool makes it incredibly easy to convert PDFs to Base64 and vice versa. Follow these simple steps:
Select the Encode tab to convert a PDF to Base64, or the Decode tab to convert a Base64 string back to a PDF.
For encoding, click the upload area and select a PDF file (up to 10MB). Then click the Encode button. For decoding, paste your Base64 string in the input field and click the Decode button.
Click the Copy to Clipboard button to copy the Base64 string to your clipboard. For decoded PDFs, click the Download PDF button to save the PDF file to your device.
Paste the Base64 string into your HTML, JSON, or code. For HTML, use it in an iframe tag with data:application/pdf;base64, prefix, or in a download link. For JSON APIs, include it as a string value.
This tool supports PDFs up to 10MB in size. For larger PDFs, consider using command-line tools or programming libraries. Keep in mind that Base64 encoding increases file size by approximately 33%, so very large PDFs will result in very long Base64 strings.
This tool only supports PDF files (application/pdf). Only PDF files can be uploaded and processed. Other file types will be rejected to ensure data integrity and proper encoding/decoding.
Use the Base64 string in an iframe tag or download link with the data URI format:
Yes! Base64 PDFs are commonly used in JSON APIs to send PDF documents as text strings:
Base64 encoding increases the size of binary data by approximately 33%. This is because Base64 uses 4 characters to represent every 3 bytes of binary data. A 1MB PDF will result in approximately 1.33MB of Base64 text. This is why Base64 PDFs are commonly used for smaller documents or when text-based transmission is required, such as in JSON APIs or email attachments.
Yes! All PDF processing happens entirely in your browser using JavaScript. Your PDFs are never sent to any server, stored, or shared. Everything is processed locally on your device, ensuring complete privacy and security. This is especially important for sensitive documents.
🚀
Help others discover this tool quickly
Subscribe to FrontendGeek Hub for frontend interview preparation, interview experiences, curated resources and roadmaps.
All in One Preparation Hub to Ace Frontend Interviews. Master JavaScript, React, System Design, and more with curated resources.
© 2026 FrontendGeek. All rights reserved
