Submitting multiple scanned documents, receipts, or photos as a single file is a common requirement for forms and applications, but most photo apps only export one image at a time.
This guide covers how to combine images into a PDF for free, including page reordering and sizing options.
Key Takeaway: "Fit to Image" page sizing matches each PDF page exactly to its source image's dimensions, which avoids the awkward white borders that happen when a photo doesn't match A4 or Letter's aspect ratio.
Choosing a Page Size
| Page size | Best for |
|---|---|
| A4 / Letter | Documents meant to be printed, forms, scanned paperwork |
| Fit to Image | Photos and screenshots where you want no white border at all |
Tip: Add all your images first, then reorder by dragging — it's much faster than trying to upload them in the exact final order from the start.
Step by Step: How to Combine Images into a PDF
TinyPNG Now includes a free images-to-PDF tool that runs entirely in your browser.
- Open the Images to PDF tool and drag in multiple images at once.
- Drag any thumbnail to reorder it before creating the PDF.
- Pick a page size (A4, Letter, or Fit to Image), orientation, and margin.
- Click Create PDF to generate and download the combined file.
Common Mistakes When Combining Images into a PDF
Most problems with a combined PDF come from the source images, not the tool. A few habits prevent the usual headaches:
- Skipping compression on phone photos. A dozen 4MB photos make a PDF that many forms and email systems reject. Shrink the images first, or see how to hit an exact file size and compress images for email.
- Mixing portrait and landscape pages without a plan. With A4 or Letter, a landscape photo gets letterboxed on a portrait page. Rotate sideways scans first with the Rotate tool, or use Fit to Image so every page matches its picture.
- Leaving pages out of order. Reorder the thumbnails before you click Create PDF. Fixing order afterward means starting over.
- Using Fit to Image for printed forms. Odd page sizes print badly. For anything that will be printed or signed, pick A4 or Letter.
- Photographing documents at an angle. Shoot straight on in even light so text stays readable once the page is scaled into the PDF.
If the finished PDF is still too large, the fix is almost always smaller source images rather than a different page size.
Other Ways to Combine Images into a PDF
You can also combine images with tools built into your device. Menus change between versions, so treat these as a guide:
- Windows: select the images in File Explorer, right-click and choose Print, then pick Microsoft Print to PDF as the printer and save the file.
- Mac: open the images together in Preview, arrange the thumbnails in the sidebar, then use File > Print and choose Save as PDF.
- iPhone and iPad: in the Files app, select the images and use the Create PDF quick action (available in recent iOS versions).
- Android: options vary by phone. Many gallery and Drive apps offer a print or scan option that saves as PDF.
The built-in methods need a specific operating system or app. The free Images to PDF tool works the same way in any browser, lets you reorder pages before you create the file, and runs on your device without uploading your images.
How to Keep the PDF Small
A combined PDF is roughly as big as the images inside it, so shrinking the images first is the most effective step.
- Resize to the page size. An A4 page at 150 DPI is about 1240 x 1754 pixels, and at 300 DPI about 2480 x 3508 pixels. Photos much larger than that only add weight. Use the Resize tool.
- Compress the images with the compressor before building the PDF. See also how to compress images without losing quality.
- Pick JPG for photos. PNG is better for sharp text and graphics but is usually larger for photographs.
- Check the upload limit of the form or email you will send it to, and aim to stay under it.
Need to go the other way? You can also convert a PDF back into images.
Frequently Asked Questions
How many images can I combine?
Any number — there's no fixed limit, though very large batches will take longer to process since everything runs in your browser.
Can I change the order of pages?
Yes. Drag and drop any image thumbnail to reorder it before creating the PDF — the page number updates automatically.
What page sizes are supported?
A4, Letter, or Fit to Image, which sizes each PDF page exactly to match its source image instead of a standard paper size.
Is the Images to PDF tool free?
Yes, completely free with no signup and no limits.
Are my images uploaded to a server?
No. The PDF is generated entirely in your browser using jsPDF. Your images are never uploaded anywhere.
How do I combine photos into one PDF on my phone?
Open the Images to PDF tool in your phone browser, select the photos, drag them into the order you want and tap Create PDF. You can also use your phone's built-in Files, Drive or scan options.
How do I make a combined PDF smaller?
Resize and compress the images before you combine them, because the PDF size follows the size of the images inside. Roughly 1240 x 1754 pixels fills an A4 page at 150 DPI.
Can I mix JPG and PNG images in one PDF?
Yes. You can add different image types together and each becomes a page. Convert unusual formats such as HEIC to JPG first if a file will not load.
Summary: Open the free TinyPNG Now images-to-PDF tool, reorder if needed, create PDF — free, private, and instant.