How to Resize a Photo on iPhone (3 Easy Methods) Your iPhone takes 12MP or 48MP photos — 4032x3024 or 8064x6048 pixels. That is excellent for printing and editing, but far too large for email attachments, web uploads, and form submissions that want "under 1MB" or "maximum 1200px wide." The problem: the iPhone Photos app can crop but cannot resize. There is no built-in way to change pixel dimensions. You can trim the edges, but the remaining image stays at full resolution. Here are three methods that actually work, starting with the fastest. Method 1: Resize in Safari with Pixotter (No App Needed) Pixotter's resize tool runs directly in mobile Safari. No app to install, no account to create, and your photos never leave your device — all processing happens on your iPhone. Open Safari and go to pixotter.com/resize/ . Tap the drop zone and select your photo from the Photos library. Enter your target dimensions — width and height in pixels. Lock the aspect ratio to avoid stretching. Tap Process .…