Last updated 3 September 2026
Fit to image, or a standard page size
Fit to image makes each PDF page exactly the size of the photo that fills it — nothing cropped, nothing padded, and the aspect ratio is always exactly right. It's the better choice when the PDF is for viewing on screen.
A4 or Letter places each image centred on a standard page with a small margin, which is what you want when the PDF is going to be printed and needs to match other printed pages.
Reordering
Drag any item in the list up or down before creating the PDF — pages come out in the order shown, top to bottom. Removing an image only removes it from the list; nothing is deleted from your device.
Related guide: Preparing artwork for print without a reprint
Page size, orientation and fitting
Images have pixel dimensions; PDF pages have physical ones. Converting means deciding how one maps onto the other, and the choice matters more than people expect. A4 is 210 × 297 mm and is standard nearly everywhere except North America, where US Letter is 216 × 279 mm. The two are close but not interchangeable — a document laid out for one will shift slightly when printed on the other.
How the image sits on the page is the second decision. Fitting the whole image inside the page preserves the entire picture and leaves margins where the proportions do not match. Filling the page removes those margins but crops whatever falls outside. For scanned documents, fitting is almost always right, since a cropped edge may take text with it. For photo pages, filling usually looks better.
Resolution and file size
A PDF page does not add detail to an image, it only places it. What determines print quality is how many pixels are spread across the physical page: roughly 300 pixels per inch for good print, and 150 is acceptable for a document that will mostly be read on screen. An A4 page at 300 DPI needs an image around 2,480 × 3,508 pixels. Anything much smaller will look soft when printed, no matter what the PDF page size says.
File size follows from the same arithmetic. Twenty phone photos at full resolution can easily produce a PDF too large to email, and the fix is to resize the images before converting rather than to compress the PDF afterwards. Reducing to the pixel dimensions you actually need gives a smaller file and a better-looking one than heavy compression of oversized originals.
Common questions
How many images can I combine?
There's no fixed limit — it depends on your device's memory, since everything happens in your browser. A few dozen ordinary photos works comfortably on most phones and computers.
What's the difference between Fit to image and A4/Letter?
Fit to image makes each PDF page exactly the size of its photo, so nothing is cropped or padded. A4 or Letter places each image centred on a standard page size, which is usually what you want if the PDF will be printed.
Are my images uploaded anywhere?
No. The PDF is built entirely in your browser using a JavaScript library, and nothing is sent to a server. That also means very large batches depend on your own device's memory rather than an upload limit.
Can I change the order of the images?
Yes. Drag any image in the list to reorder it before building the PDF. Pages come out in the order shown in the list, top to bottom.
Should I use A4 or US Letter?
A4 is standard in most of the world; US Letter is used in the United States and Canada. They are close in size but not identical, so a document laid out for one shifts slightly when printed on the other. Match whichever the recipient will print on.
What resolution do I need for printing?
Around 300 pixels per inch across the physical page, which for A4 means an image of roughly 2,480 × 3,508 pixels. About 150 DPI is acceptable for documents that will mainly be read on screen. The PDF page size does not add detail the image lacks.
How do I reduce the size of the resulting PDF?
Resize the images before converting rather than compressing the PDF afterwards. Reducing them to the pixel dimensions actually needed produces a smaller and better-looking file than heavy compression applied to oversized originals.