Merge PDF
Upload, reorder, and seamlessly merge multiple PDF files locally.
Upload PDFs
Drag and drop multiple PDF files or click to select.
Click or drag PDFs here
Upload multiple PDF files to merge them. Max 10MB per file.
About Merge PDF
The **Merge PDF** tool empowers you to upload multiple PDF files, visually arrange their order via drag-and-drop, and fuse them into a single document. Engineered for privacy, all complex PDF manipulation executes entirely inside your browser's local sandbox—no file ever leaves your device.
How to Use
Real-World Examples
Merging Invoice Batches
Upload five separate single-page invoices. Leave 'Merge All Pages' toggled on, verify they are chronologically ordered by dragging them, and hit Merge to generate a unified monthly expense report.
Extracting & Combining Chapters
Upload Book A and Book B. Switch the page selection mode to 'Select Specific Pages'. Input '10-25' for Book A and '5-15' for Book B to stitch together only the specific chapters you need into a new research packet.
Best Practices
- Use the visual thumbnails to double-check that you're merging the right documents.
- If file size is a concern, ensure 'Optimize Output Size' is toggled on to compress the internal PDF object streams.
Pro Tips
You can rename your merged output file directly in the success dashboard before downloading.
Copy your 'Merge Summary' to the clipboard for an exact record of the operation's duration, sizes, and file counts.
Toggle 'Preserve Metadata' if you want the final merged file to inherit the Title and Author of the very first file in the list.
Frequently Asked Questions
Are my documents uploaded to a server?
No. Everything runs strictly locally via JavaScript (pdf-lib) in your browser.
Is there a limit on how many PDFs I can merge?
There's no hard limit, though very large files (hundreds of megabytes) might cause your browser tab to run out of memory.
Can I copy the original bookmarks (outlines)?
Currently, our local merge engine does not support migrating structural bookmarks across documents.
Security & Privacy
100% Secure & Private. All PDF parsing, thumbnail generation, and merging occurs entirely within your browser's local memory. Your sensitive documents are never uploaded to our servers, keeping you compliant with strict data policies.