Embedding PDF Documents in API Payloads
When building integrations with document signing services, billing systems, or serverless microservices, converting PDF files to Base64 strings is standard practice.
Frequently Asked Questions
Why should I convert a PDF document to Base64?
Converting a PDF to Base64 allows you to transmit documents inside JSON REST API payloads, send email attachments via SendGrid/Mailgun APIs, or store small PDF files directly in document databases (MongoDB, DynamoDB, PostgreSQL JSONB).
How do I encode a PDF to Base64 using this tool?
Drag and drop any .pdf file into the dropzone. The tool reads the binary file using the FileReader API and outputs the full Base64 Data URI with one-click copy.
Is there a file size limit for PDF to Base64 conversion?
Because conversion runs locally in browser memory, you can encode PDF documents of up to 50MB quickly with no server timeout limits.
Are my PDF files uploaded or stored on any server?
No! The PDF never leaves your device.
How do I send a Base64 PDF in a JSON POST API request?
Include the Base64 string in your JSON payload: '{ "file_name": "invoice.pdf", "file_data": "JVBERi0x..." }'.
How much does encoding increase the PDF file size?
Base64 increases the size of the PDF by approximately 33% (4 Base64 characters per 3 binary bytes).