Base64 PDF decoder

Base64 to PDF Converter

Decode a Base64 PDF string, data URL or embedded code snippet into a real PDF preview. Inspect the document and download it locally without uploading data to a server.

Input

Paste Base64 PDF

Auto extract

Paste raw Base64, a data:application/pdf URL, or PDF data embedded in JSON, HTML or JavaScript. FileFlow extracts and validates the PDF locally.

Drop a .txt, .json, .html or .js file here. PDF data stays in this browser.

Each option loads the same complete one-page PDF in a different reusable format.

Up to 10 MB
Output

PDF preview

Waiting for input
Your PDF will appear here

Decode Base64 PDF data to preview the document, version, page count and file size before downloading.

Real PDF fileLocal previewNo upload
How it works

Convert Base64 data into a real PDF

Paste raw Base64, a data:application/pdf;base64 URL, or a PDF value embedded in JSON, HTML or JavaScript. The browser decodes the bytes, validates the PDF header and creates a local PDF preview.

Private by design

No backend or file upload

The Base64 string is processed on your device. FileFlow creates a temporary browser object URL for preview and download, then releases it when you clear the result or leave the page.

Supported input

Raw Base64, data URLs and snippets

The converter extracts PDF Base64 from common developer formats and accepts URL-safe Base64 characters. It rejects image data and other file types instead of creating a misleading PDF download.

How to convert Base64 to PDF

  1. Paste the PDF Base64 string or data URL.
  2. Click Convert Base64 to PDF.
  3. Preview the document and download the generated PDF.

Base64 to PDF FAQ

Does the converter create a new PDF layout?

No. It decodes the original PDF bytes represented by the Base64 string. The document content and page layout remain unchanged.

Can I paste Base64 from JSON or JavaScript?

Yes. The tool can extract a PDF data URL or a Base64 value beginning with the standard PDF signature.

Why is my Base64 rejected?

The data may be incomplete, corrupted, larger than the browser limit or may represent a different file type instead of PDF.

PDF workflow

Continue with PDF and Base64 tools

Encode the PDF again, export pages as images or open the full PDF toolkit.

PDF to Base64 Encode a PDF as raw Base64, a data URL, JSON or JavaScript. PDF to JPG Export PDF pages as lightweight JPG images. PDF to PNG Export PDF pages as sharp PNG images. All PDF Tools Open the complete PDF tool collection.
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