A form that only accepts 1 MB files, an email that bounces, or a slow page all have the same cause: images that are too heavy. These are the three adjustments that cut file size the most.
1. Lower the dimensions
A phone photo is around 4000 × 3000 px. On a screen you almost never need more than 1920 px wide. Shrinking it with Resize images cuts more than 75% of the file size without it being noticeable.
2. Adjust the quality
With JPG, a quality of 70 to 80% cuts the size a lot with an almost invisible difference. Below 60%, blocky artifacts start to show. Compress images lets you choose the level and shows you how much you saved.
3. Use the right format
- Photographs: JPG or WebP.
- Screenshots, logos and text: PNG, or WebP if you need a smaller file.
- A PNG screenshot converted with PNG to JPG can go from 2 MB to 200 KB.
Common mistakes
- Compressing an image that has already been compressed several times: each pass loses detail. Always start from the original.
- Enlarging a small image: it doesn't get sharper, it just gets heavier.
- Using PNG for photos: they weigh 5 to 10 times more than the same JPG.
Quick table
| For… | Width | Quality |
|---|---|---|
| Email or WhatsApp | 1280 px | 75% |
| Website | 1920 px | 80% |
| Forms with a size limit | 1280 px | 65–70% |