How to Combine Scanned Pages into One PDF

Are my scans images or PDFs?

Check the file extension before you start. Phone scanning apps and many flatbed scanners can save as JPG, PNG or PDF. If you have .jpg or .png files, use Image to PDF. If you already have several .pdf files, one per page or one per batch, use the PDF Merger, which joins PDFs without turning them back into images.

Some scanners save HEIC or TIFF files. The Image to PDF tool accepts JPG and PNG only, so convert those first, for example by exporting as JPG from your photo app.

How should I prepare scanned pages?

Crop each page to its edges. Phone photos usually include a table, fingers or shadows, and those borders waste space and look untidy when printed. The Image Cropper lets you drag a free crop or nudge it with the arrow keys, and exports JPG, PNG or WebP; choose JPG or PNG for this job.

Keep every page the same way up. Rotate sideways photos in your phone’s gallery before adding them, because the PDF page shows the image as it is stored. Shoot or scan in even light, flat on, so text lines are straight and readable.

Which page settings work best for scans?

Page size: A4 is the default and matches most documents outside North America; Letter suits US paperwork; Original / auto makes each page match its image shape. Orientation: Auto chooses portrait or landscape for each image, which is useful when a document mixes portrait pages with a landscape table. Margin: None, Small or Medium; Small is the default. Fit: Fit to page shows the whole page without cutting, Fill page fills the page and may crop edges, and Original size keeps the image’s own scale.

For scans of paper documents, Fit to page with a Small or None margin is usually right, because it keeps every edge of the page visible.

Defaults are A4, Auto orientation, Small margin and Fit to page, which suit most scanned documents.

How do I get the pages in the right order?

Images appear in the list in the order you add them. Name your files with leading zeros, such as page-01.jpg to page-12.jpg, so your file picker sorts them correctly, then select them all at once. If one is out of place, use Move up or Move down beside it, or Remove it and add it again.

Before building, scan down the list and check page numbers printed on the document itself. It is much quicker to fix order now than to split and rebuild the PDF later.

Why is my scanned PDF so large, and what can I do?

Each page is a full picture, so size grows with the number of pages and their resolution. The tool already reduces images whose longest side is over 2,000 pixels before embedding, which keeps text readable while limiting size. If the result is still too big for an upload limit, run it through the PDF Compressor; Strong compression is designed for image-heavy PDFs like scans.

Saving pages as JPG instead of PNG before you add them also usually makes a smaller PDF, because JPG suits photographs of paper with uneven shading.

How do I get clear scans with a phone?

Lay the page flat on a dark, plain surface so the edges stand out, and hold the phone directly above it rather than at an angle. Turn off the flash if it makes a bright spot on glossy paper, and use daylight or two lamps from opposite sides to avoid shadows from your hand and phone.

Take the photo at the camera’s normal resolution. A modern phone photo is often 4,000 pixels or more on the long side, which the tool reduces to 2,000 pixels before embedding. That is still enough detail for ordinary printed text, so there is no need to use special high-resolution modes, which only make the files slower to handle.

Zoom in on each photo before adding it. If small print or a signature is blurred, retake that page now; a blurred page cannot be fixed later by compression or conversion.

What should I check before sending the combined PDF?

Open the downloaded file and page through it once. Confirm the page count matches the original document, that no page is upside down, and that the first page is the one the reader expects to see. If you need to change anything, the quickest fix is usually to adjust the list in Image to PDF and build the file again, since it takes only seconds.

Rename images.pdf to something meaningful, such as lease-signed-2026-11.pdf, before you attach or upload it.

How should I name the final file?

Use a name that says what the document is and when it is from, such as passport-application-2026-11.pdf. Portals often show only the file name to the person reviewing it, so a clear name helps them confirm they have the right document without opening it.

How do I combine scans into one PDF step by step?

1. Collect the pages. Save every scan as JPG or PNG and name them in order with leading zeros.
2. Crop and rotate. Trim the background around each page and make sure all pages are upright.
3. Add all images. Open Image to PDF and add up to 20 images in one go.
4. Check the order. Use Move up and Move down until the list matches the page numbers.
5. Choose settings and build. Pick A4 or Letter, Auto orientation and Fit to page, then create and download the PDF.
6. Review the file. Open the PDF and page through it before you send it.

Example

What should I keep in mind?

FAQ

Can I combine phone photos of documents into one PDF?

Yes. Save them as JPG or PNG, add them to Image to PDF, order them and download one PDF.

How many scanned pages can I combine at once?

Up to 20 images per PDF. For more pages, build several PDFs and join them with the PDF Merger.

How do I change the page order of my scans?

Use the Move up and Move down buttons next to each image in the list before creating the PDF.

Should I use A4 or Letter for scans?

Match the original paper. A4 is the default; choose Letter for US documents.

What fit setting keeps the whole scanned page visible?

Fit to page. Fill page can crop edges to fill the sheet.

Can I combine scans that are already PDFs?

Yes, but use the PDF Merger for PDF files. Image to PDF accepts JPG and PNG images.

Why is my combined scan PDF large?

Every page is an image. Crop, save as JPG, or compress the result with the PDF Compressor.

Can I mix portrait and landscape scans?

Yes. With Auto orientation each page follows its own image shape.

Can I search the text in a PDF made from scans?

Not without OCR, because each page is stored as an image.

Are my scanned pages uploaded anywhere?

No. The PDF is built locally in your browser.

Should I scan at 300 DPI for text documents?

300 DPI is a solid default for readable text; go higher only if you need fine print.

How do I fix a page that uploaded upside down?

Rotate that image before merging, or rotate the page after in a PDF viewer.

Can I insert a blank separator page?

Add a blank white image in the sequence where you need a divider.

Why are colors dull after combining phone photos?

Auto HDR and compression differ per shot—retake under the same lighting when color matters.

Is Letter better than A4 for US forms?

Match the form’s stated size so margins align when printed.

How can I keep file size email-friendly?

Compress the finished PDF or downsize photos before combining.

Can receipts of different widths share one PDF?

Yes—fit mode letterboxes each image on the chosen page size.

Do I need OCR before emailing a scan packet?

Only if recipients must search or copy text; image-only PDFs are fine for print.

What order should double-sided scans use?

Capture fronts in order, then backs, or use a duplex workflow that already interleaves sides.

Can I password-protect the combined scan?

Add encryption in a PDF editor after download if confidentiality requires it.

Sources and further reading

• PDF family format description (Library of Congress)