Interleave PDF

Key Features

• Smart Interleaving: Merges two PDF files by alternating pages (A1, B1, A2, B2...). Ideal for fixing separate "Front" and "Back" scans.
• Reverse Order Correction: Automatically reverses File A or File B if your scanner output the stack in reverse order.
• Auto-Insert Blanks: Intelligently detects uneven page counts and inserts blank pages to maintain correct double-sided alignment.
• Strict Order Control: Clear distinction between "Front File" and "Back File" with an instant Swap button.
• Client-Side Privacy: Your documents are processed entirely in your browser and never uploaded.
• 100% Free: No watermarks, no sign-up, and no page limits.

How do I use it?

Step 1: Upload your "Front Pages" file and "Back Pages" file. Step 2: Use the "Swap" button if they are in the wrong order. Step 3: Select "Reverse" or "Insert Blanks" if needed, then click "Mix & Merge".

How do I download?

The tool processes the files instantly and automatically downloads the new, correctly interleaved PDF. A backup download button is also provided.

Privacy & Security

We use Client-Side processing. This means your sensitive scanned documents remain on your computer and are never uploaded to our servers.

Why use this tool?

If you have a scanner that doesn't do "Duplex" (Double-sided) scanning automatically, this tool saves you hours of manual work by combining two separate scan files into one perfect document.

Is it free?

Yes, completely. Whether you are merging 2 pages or 200 pages, the tool is free to use with no hidden costs.