Merge PDF Files Online for Free
Combine multiple PDF documents into a single file. Drag to reorder, then merge instantly in your browser. No upload, no signup, 100% private.
100% Private — Your files are processed entirely in your browser and never leave your device.
Drag & drop files here or click to browse
Max file size: 100.0 MB
How to Merge PDF Files Online
1
Upload your PDF files
Drag and drop or click to select two or more PDF files from your device. There is no limit on the number of files you can add.
2
Reorder the files
Use the arrow buttons to arrange your files in the exact order you want them to appear in the final merged document.
3
Merge and download
Click "Merge PDFs" and your combined document will be ready to download in seconds. Everything runs in your browser — files never leave your device.
Frequently Asked Questions
Yes. PDFNinja.site processes everything in your browser. Your files are never uploaded to any server, so your documents stay completely private.
There is no hard limit. You can merge as many PDF files as your browser can handle. For very large batches, we recommend merging in groups of 20-30 files at a time.
No. Our merge tool combines your PDF files without any recompression or quality loss. The output file preserves the original quality of every page.
Yes. After uploading your files, use the arrow buttons to rearrange them in any order before clicking Merge.
No. All tools on PDFNinja.site are completely free with no signup, no account, and no email required.