Scanned documents often end up as several separate PDF files. You may have one PDF from a scanner, another from a multifunction printer, and a few additional pages saved separately. If you need to upload, email, archive, or share everything as a single document, the simplest solution is to merge the scanned PDFs into one file.
With PDF Hub, you can combine scanned PDF files directly in your browser using the Merge PDF tool. You do not need to install desktop software, and you can review the file order before creating the final PDF.
When should you merge scanned documents?
Merging is useful whenever several scanned PDF files belong to the same document or workflow. Common examples include:
- a signed form scanned separately from its supporting documents,
- multiple pages scanned in separate sessions,
- receipts or invoices that need to be stored together,
- application documents that must be submitted as one PDF,
- paper records that were digitized as several smaller PDF files.
If all of the scans belong together, combining them into one PDF usually makes the file easier to name, store, send, and upload.
How to merge scanned PDF documents online
1. Check that your scans are PDF files
Before you start, make sure the documents you want to combine are already saved as PDF files. PDF Hub’s Merge PDF tool combines PDF files; it does not convert JPG or PNG scans into PDF.
2. Open the Merge PDF tool
Go to the Merge PDF tool and add the scanned PDF files you want to combine.
3. Arrange the files in the correct order
Put the files in the same sequence in which you want them to appear in the finished document. This is especially important when the scans represent consecutive pages, forms with attachments, or records that must stay in chronological order.
4. Merge the PDFs
Once the order is correct, start the merge process. PDF Hub will create one PDF containing the pages from the selected files.
5. Download and review the final PDF
Open the merged file and quickly check the first page, the last page, and the transitions between the original scanned files. Confirm that nothing is missing and that the page sequence is correct.
What if the merged scanned PDF is too large?
Scanned documents can be much larger than text-based PDFs because every page may contain a high-resolution image. If the combined file is too large for email or an upload form, use the Compress PDF tool after merging.
For more detail, see How to Reduce a Scanned PDF File Size Online. If the document is mainly intended for email, you can also follow How to Compress a PDF for Email Online.
Should you compress before or after merging?
In most cases, it is easier to merge first and compress the finished PDF afterward. That gives you one final document to review and one final file to optimize.
If one scanned PDF is exceptionally large, you can compress that file before merging, but always check the resulting quality before creating the final document.
Tips for cleaner scanned PDF documents
- Remove blank or accidental scan pages before creating the final file.
- Keep pages upright and consistently oriented.
- Use clear filenames for the original scans so they are easier to arrange.
- Check whether color scanning is necessary; grayscale scans can sometimes produce smaller files.
- Keep an unmodified copy of important original scans before compressing or reorganizing them.
Can you add more scanned pages later?
Yes. If you receive another scanned PDF later, you can merge it with the existing document using the same Merge PDF tool. This is useful for records that are collected in stages.
If you need to combine only selected pages from several PDFs, see How to Combine Selected Pages from Multiple PDFs Online.
Final check before sharing
Before you email, upload, or archive the merged document, confirm that the pages are in the correct order, the scans are readable, and the final file size is appropriate for its destination. A quick review can prevent missing-page and wrong-order problems later.
When your scanned documents are already saved as PDFs, PDF Hub makes it straightforward to combine them into one organized file using the Merge PDF tool.