Base64 to PDF Viewer View Base64 PDF online instantly GitHub

Free browser-based developer tool

View PDF from Base64 Instantly

Paste Base64-encoded PDF data to preview, validate, download, and open the document directly in your browser.

Smart input cleaning PDF validation JSON field support

Step 1

Paste Base64 PDF Data

Supports raw Base64, PDF data URLs, quoted strings, and JSON API responses.

Tip: press Ctrl + Enter to preview.

Your PDF stays on this device.All decoding and preview processing runs locally in your browser.

Step 2

PDF Preview

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Paste Base64 PDF data and select “View PDF” to preview the document.

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JSON Support

Finds Base64 PDF fields inside nested API responses.

✦

Smart Cleaning

Handles whitespace, line breaks, Base64URL, quotes, and padding.

PDF

Document Details

Shows the PDF page count and decoded file size immediately.

✓

Local Processing

Processes document data directly in your browser.

How it works

Preview a Base64 PDF in three steps

  1. Paste your dataUse raw Base64, a PDF data URL, or an entire JSON response.
  2. View the PDFThe tool cleans, decodes, validates, and renders the document.
  3. Use the resultNavigate pages, zoom, download the PDF, or open it in a new tab.

FAQ

Base64 PDF viewer questions

How do I view a PDF from Base64?

Paste the Base64 value into the input area and select View PDF. The document is decoded and rendered directly in the page.

Can I paste a complete JSON API response?

Yes. The tool searches nested JSON fields for PDF Base64 data and opens the first matching document.

Which Base64 formats are supported?

Raw Base64, PDF data URLs, Base64URL characters, quoted values, whitespace, line breaks, and missing padding are handled automatically.

Is the PDF uploaded?

No. The Base64 value is decoded and previewed locally inside your browser.