Whether you're pulling together a multi-page report, combining invoices for a client, or just tidying up a bunch of scanned documents — merging PDFs is one of those tasks you shouldn't have to think twice about. Here's exactly how to do it.
Why merge PDFs in the first place?
Sending multiple files when one would do creates friction. Recipients have to open each file separately, things get lost in email threads, and file names like report_final_v3_UPDATED.pdf start multiplying. A single merged PDF is cleaner, easier to share, and simpler to archive.
Combine a cover page, slides, and appendix into one clean file.
Bundle monthly invoices into a single document for accounting.
Merge lecture PDFs into one file to study from a single place.
Submit a CV, cover letter, and portfolio as one attachment.
How to merge PDFs using AllPDFStuff
AllPDFStuff's merge tool runs entirely in your browser — nothing to install, and your files are automatically deleted after one hour.
Head to allpdfstuff.com and sign up free. No credit card needed — a free account gives you 5 merges per month.
Drag and drop multiple PDF files at once directly onto the page, or click to browse and select them. Files up to 10 MB are free; upgrade to Pro for files up to 100 MB.
Once your files are uploaded, choose Merge PDF from the tool selector. The tool will automatically detect you've added multiple files.
Hit the merge button and your combined PDF will be ready to download in seconds. That's it.
What about file size?
Merging PDFs doesn't automatically make the file smaller — it just combines them. If your merged file ends up too large to email, run it through the Compress PDF tool afterwards to reduce the size without noticeable quality loss.
Is it safe to merge PDFs online?
A fair question. With AllPDFStuff, your files are processed securely and automatically deleted from the server after one hour. We don't store, read, or share your documents. If you're dealing with highly sensitive files, that one-hour auto-deletion means nothing lingers on the server.
Frequently asked questions
How many PDFs can I merge at once?
You can merge as many files as you need in a single session. Just drop them all into the upload area together.
Will merging PDFs affect the quality of images or text?
No. Merging is a lossless process — the content of each file is preserved exactly as-is. Nothing gets re-compressed or downgraded.
Can I merge a Word doc and a PDF together?
Not directly — you'd need to convert the Word doc to PDF first. Use the Word to PDF tool, then merge the resulting file with your other PDFs.
Do I need to pay to merge PDFs?
Merging is available on the free plan — you get 5 tasks per month at no cost. Need more? Pro gives you 50 tasks per month for $9.99.
What happens to my files after I download them?
All uploaded and processed files are automatically deleted from our servers after one hour. We don't keep copies of your documents.