Most image problems come down to the same handful of mistakes, made in the same order. Once you know what they are, they're easy to avoid — and the difference between a photo that gets accepted, printed or clicked and one that doesn't is often a single setting.
This is the checklist, in the order that actually matters.
1. Start from the best original you have
Everything else depends on this. Each time an image is saved as JPG, compressed, or sent through a messaging app, a little quality is permanently lost — and it stacks.
- Work from the file in your camera roll, not the version a friend sent you back
- Avoid screenshotting an image to "get a copy" — that locks in your screen's resolution and adds another round of compression
- Never edit and re-save the same JPG repeatedly; keep the original and export copies
A photo that has been through WhatsApp twice cannot be restored, no matter what you do to it afterwards.
2. Do the destructive steps in the right order
Some operations throw information away. Doing them in the wrong sequence throws away more than necessary.
The correct order:
- Crop — remove what you don't need
- Edit — brightness, contrast, colour balance
- Resize — set the final target dimensions
- Compress — set the export quality and format
Compressing first and then cropping means you compressed pixels you were about to delete. Resizing before editing means you edited fewer pixels than you had available.
3. Match dimensions to the actual use
The single most common waste is an image far larger than anything that will display it.
| Destination | Sensible Width |
|---|---|
| Social media post | 1,080–1,600 px |
| Website image | 1,200–2,000 px |
| Email attachment | 1,600–2,000 px |
| Online form or ID upload | Whatever the portal specifies |
| Printing at A4 | ~2,500 px |
4. Pick the format on purpose
- Photographs → JPG
- Logos, graphics, screenshots of text, transparency → PNG
- Images for your own website → WebP
- Uploads to a bank, government portal or job site → JPG, unless told otherwise
Saving photographs as PNG is the most expensive mistake — creating a file 5–10× larger for a visual difference nobody can detect.
5. Compress to a target, not to a habit
Work backwards from the requirement:
- No limit specified → 80–85% is visually indistinguishable from the original
- A stated file size limit → reduce dimensions first, then lower quality only as far as needed
- Will be printed → 90%+, and don't reduce dimensions below print spec
6. Check it at the size it will be seen
Reviewing a photo at full screen when it will be seen as a small 200px card tells you almost nothing useful:
- Product photo? Look at it as a thumbnail. If you can't tell what it is, crop tighter.
- Printing it? Zoom to 100% and look at the finest detail.
- Uploading an ID photo? Zoom in on the face and check it's sharp and evenly lit.
- Cut out a background? Zoom into the edges and check for leftover halos.
7. Keep your originals
Always export copies and leave the master source file untouched.
Pro Habit: Place edited exports in a separate output directory from your raw originals to prevent accidental overwrites.