FormatFoxResize changes the dimensions
The picture is redrawn at a smaller pixel grid. Everything in the frame stays in the frame. This is what you want for avatar requirements, forum limits and website images.
How to resize an image on iPhone
Pixels and bytes are two different measurements, and most upload forms care about both. This page is about the first one.
Resizing is free in FormatFox, on the device, with no file counter.
Pixels are not bytes
A form that asks for an image no larger than 1024 by 1024 is talking about pixels. A form that asks for under 2 MB is talking about bytes. They are related but they are not the same request, and a tool that only compresses will never satisfy the first one.
Compress changes the file
The dimensions stay, the encoder simply describes them less precisely. This is what you want when the pixel count is already fine and only the size is a problem. See compress photos.
How the resize works in FormatFox
- Load an image and open the options card. The Resize control sets one number: the maximum length of the longest side, in pixels.
- The shorter side follows automatically, so a 4032 by 3024 photo limited to 1600 becomes 1600 by 1200. Nothing is stretched and nothing is cut off.
- Rotation is applied to the actual pixels during the resize, and the output is then tagged as upright. That is why the result looks the same in Photos, in a browser and on a Windows machine.
- The result line reports the new pixel dimensions along with the exact byte count before and after.
Common targets worth remembering
| Longest side | Typical use | Note |
|---|---|---|
| 512 | Profile picture, forum avatar, app icon source | Square crops are still your job, in Photos |
| 1024 | Older upload forms, ticket attachments | Fine print in a photographed document starts to suffer |
| 1600 | Mail attachments and web images | The usual sweet spot for readable documents |
| 2048 | Anything that will be looked at on a large screen | Still a fraction of the original file |
Resize and convert are one pass. Setting a target format and a longest side at the same time decodes the picture once and writes it once, which is gentler on the image than converting first and resizing afterwards.
Questions people ask
Can I resize a photo on iPhone without cropping it?
Yes. Cropping removes part of the picture, resizing keeps all of it and draws it with fewer pixels. The Photos app edit tools crop; FormatFox resizes, by setting the longest side and letting the shorter side follow so the aspect ratio is untouched.
Why does a resized photo sometimes come out sideways?
Because orientation lives in a metadata tag rather than in the pixels. If a tool rewrites the pixels but drops the tag, the picture rotates. FormatFox bakes the rotation into the pixels while resizing and then writes the orientation tag as upright, so the result looks the same everywhere.
Does resizing reduce the file size?
Almost always, and usually by a lot, because the file has to describe far fewer pixels. It is the single most effective lever for getting under an upload limit. The details of the second lever, compression, are on the compress photos page.
Can FormatFox make a small image bigger?
It is built for scaling down. Enlarging an image cannot invent detail that was never captured, so treat the original pixel count as your ceiling and work below it.
Keep reading
- Audio converter for iPhoneM4A, WAV, AIFF and CAF on device, what the encoder settings are, and why MP3 goes in but never comes out.
- Convert files without uploading themWhat a browser converter has to do with your file, what FormatFox does instead, and the one thing that does use the network.
- Best file converter app for iPhoneSix questions to ask before you install a converter, answered honestly for FormatFox, limits included.
Set the dimensions and be done