Base64 to PDF Decoder

Base64 PDF decoding converts a Base64 encoded string back into its original PDF document. This tool validates the data, detects the PDF format using magic bytes, and displays the decoded document in your browser.

You can use:

• Raw Base64 — Just the encoded data (e.g., JVBERi0...)
• Data URL — Complete data URL format (e.g., data:application/pdf;base64,JVBERi0...)
• URL-safe Base64 — Base64 with - and _ characters

PDF files always start with the magic bytes %PDF (hex: 25 50 44 46). This tool checks for this signature to ensure the decoded data is actually a PDF document.

Yes, there is a size limit to ensure optimal performance. Very large PDFs may take longer to decode and display.

Your data never leaves your browser. All decoding happens locally on your device using JavaScript — nothing is uploaded to any server.