iPhone Photo Resolution for Photo Book Pages That Print Sharp

6 September 2026 · 6 min read · By Kaushal Sharma · guides, photos, printing

Most people worry about the wrong thing here. They assume phone photos are too small to print, so the book never gets made. The truth is the opposite: a normal 12 MP iPhone photo fills a full A4 page with room to spare. What ruins prints is not the camera, it is the copy of the photo you upload. This post covers photo resolution for photo book printing in plain numbers: the 300 dpi rule, what your iPhone can fill, why HEIC and Live Photos are fine, why WhatsApp forwards and screenshots are not, and how to check any photo in ten seconds.

The 300 dpi rule, in plain numbers

Printers talk in dots per inch. The rule of thumb for a photo book is 300 dpi: for every inch of paper, you want 300 pixels of photo. Multiply the print size in inches by 300 and you have your number.

An A4 page is 8.27 by 11.69 inches. At 300 dpi that is about 2480 by 3508 pixels. A 10x10 inch page needs 3000 by 3000.

A 12 MP iPhone photo is 4032 by 3024 pixels. Lay it on a full A4 page the same way round and it lands at roughly 365 dpi on its short side, which is more than the paper can show. Crop it the other way round, to fill an upright page, and you still get about 260 dpi. Newer iPhones shoot 24 MP or 48 MP, more than any page in a book can use.

So 300 is the target, not a cliff. Anything above 200 dpi looks sharp from where you actually hold a book. Below 150 you start to see softness, and below 100 you see blocks.

What can a 12 MP iPhone photo fill?

Here is the same maths for real layouts. Our layout engine places up to four photos on a page side, so the smallest slot to think about is a quarter of a page. The pixel counts below hold whichever way round the page sits.

The short version: any photo taken with the iPhone camera itself, from the iPhone 6s onward, has enough pixels for any page in any of our three books. Which size suits your trip is a separate question, and our A4 vs 10x10 inch size guide walks through it. Prices are in the pricing section.

The photos that actually print badly

Resolution problems almost never come from the camera. They come from copies. Four culprits.

WhatsApp forwards. WhatsApp shrinks every photo it sends. A 12 MP original comes out the other end at around 1 to 2 megapixels, with heavy compression on top. Fine on a phone screen, fine for a quarter page. On a full A4 page it goes soft, and skin and sky turn blotchy. Even the HD option compresses. If a cousin has the only copy, ask them to send it as a document (the paperclip, then Document) or through Google Drive, which keeps the original untouched.

Screenshots. A screenshot is at most the size of your screen, roughly 1,200 by 2,600 pixels on a recent iPhone, and the photo inside it is smaller still once you crop off the app around it. Screenshots of Instagram posts and video calls are the weakest photos that end up in a book. If the photo is yours, find the original in Photos. If not, ask for it.

Downloads from social media. Instagram serves photos at 1080 pixels wide, and Facebook compresses hard too. Enough for a quarter page, not for a full one.

Cloud previews instead of originals. Google Photos is fine as long as you download the photo itself and not a chat preview of it. Our guide to printing from Google Photos covers the download step. On an iPhone with Optimise iPhone Storage on, be on Wi-Fi when you upload, so iOS can fetch the full-size original from iCloud as you pick each photo.

HEIC, Live Photos and portrait mode

Three iPhone things people ask about, and the answer to all three is relax.

HEIC is fine. Since iOS 11 the iPhone saves photos as HEIC by default. It is the same 4032 by 3024 pixels in a smaller file. Upload it as it is. When a site only takes JPEG, Safari converts the file on the way up without you doing anything. Do not run photos through a random HEIC to JPG website first. Many of them shrink the image while converting.

Live Photos are fine. A Live Photo is a normal 12 MP still with a short video attached. When you upload it, the still frame goes up, and that is what prints. One catch: if you changed the key photo to a frame from the video, that frame is lower quality than the original still. Switch back before printing.

Portrait mode is fine. Portrait photos are full resolution with a blur applied. They print well. Zoom in on the edges of hair and glasses before using one on a full page, because a wobbly edge you never noticed on the phone is obvious at A4.

How do you check a photo’s resolution on iPhone?

1. Open the photo in the Photos app.
2. Swipe up on it, or tap the small “i” button.
3. Look at the line under the camera details. It reads something like “12 MP 4032 x 3024” and says HEIF or JPEG.
4. If it reads 2 MP or less, use it small or find the original.
5. Photos taken on the phone show the iPhone model and lens. A forwarded photo shows nothing there. That is the quickest tell.

A five-point check before you upload

Do this once, before you start the book.

1. Pick photos from your own camera roll, not from chats.
2. For anything that came from someone else, ask for the original or a send-as-document copy.
3. Skip screenshots entirely, or keep them to a quarter page.
4. Leave HEIC, Live Photos and portrait mode exactly as they are.
5. Be on Wi-Fi so iCloud originals download while you upload.

You do not need a new camera and you do not need to convert anything. For the rest of the flow, from camera roll to doorstep, read how to make a photo book from your phone. When you start a book at app.apnistories.com, the layout engine builds a first draft in a few minutes, and the page-by-page preview shows how each photo sits before you order.

Questions people ask

Is 12 MP enough for a photo book? Yes. A 12 MP photo is 4032 by 3024 pixels, which covers a full A4 page at over 300 dpi. It is enough for every page in every book we print.

Do I need to convert HEIC to JPEG before uploading? No. HEIC holds the same pixels as a JPEG in a smaller file, and Safari converts it on upload if a site needs JPEG. Converting through a random website can shrink the photo, so leave it alone.

Can I print WhatsApp photos in a photo book? You can, but keep them small. A WhatsApp forward is usually 1 to 2 megapixels, which looks fine at a quarter page and soft at a full page. Ask the sender to share the original as a document instead.

What dpi should a photo book be printed at? 300 dpi is the target. Anything above 200 still looks sharp from normal reading distance. Below 150 you will notice the softness.

Do Live Photos print properly? Yes. The still frame of a Live Photo is a full-resolution photo, and that is what gets uploaded and printed. The short video is simply left behind.

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