How to resize an image
- Add your images. Drag them into the box or tap Choose Images. The original size of the first image is filled in for you.
- Set the new size. Type a new width or height in pixels, choose a percentage, or pick a preset such as Instagram post or passport photo.
- Resize and download. Click Resize, then download each image or all of them as a ZIP.
Crop, fit or stretch?
When the new size has a different shape from your photo – for example turning a tall phone photo into a square – you choose what happens:
- Crop to fill trims the edges evenly so the picture fills the whole size. Best for profile pictures, thumbnails and form photos.
- Fit with border shows the whole picture and adds white bars to fill the gap.
- Stretch forces the picture to the new size. People and objects may look squashed.
Sharp results
Shrinking a big photo in one step can make it look jagged. ConvertKettle reduces large images in several smaller steps, which keeps edges and text crisp. Making an image bigger than its original size can't add detail, so it may look soft.
Need the file under a certain size in KB too? Resize first, then use Compress Image. Want a different format instead? Try the Image Converter.
Frequently asked questions
How do I resize an image without stretching it?
Keep Keep proportions ticked and enter only the width or the height. The other side is worked out for you so the picture is never stretched.
How do I resize a photo to an exact size like 200×230?
Untick Keep proportions, enter both numbers, and choose Crop to fill. The photo is trimmed evenly from the edges so it fills the exact size without stretching.
Are my images uploaded?
No. Resizing happens in your browser and your images never leave your device.
Can I resize many images at once?
Yes. Add as many as you like. They're all resized with the same settings and you can download them together as a ZIP.
Will resizing reduce the file size?
Making an image smaller in pixels almost always makes the file smaller too. To hit an exact file size in KB, use Compress Image afterwards.
Pixels, inches and DPI explained
Digital images are measured in pixels. Inches only matter when you print, and the link between the two is DPI (dots per inch). Photo labs print at about 300 DPI for sharp results, so a 4×6 inch print needs an image of roughly 1200 × 1800 pixels. Screens don't care about DPI at all – only the pixel dimensions.
Common US print sizes in pixels
| Print size | Pixels at 300 DPI | Shape |
|---|---|---|
| Wallet (2.5 × 3.5 in) | 750 × 1050 | 5:7 |
| 4 × 6 in | 1200 × 1800 | 2:3 |
| 5 × 7 in | 1500 × 2100 | 5:7 |
| 8 × 10 in | 2400 × 3000 | 4:5 |
| 8.5 × 11 in (Letter) | 2550 × 3300 | 17:22 |
| 11 × 14 in | 3300 × 4200 | 11:14 |
Most phone photos have a 4:3 shape, so printing them at 4×6 or 8×10 trims a little from the edges. Choose Crop to fill to control exactly what's kept, or crop first with Crop & Rotate.
Recommended sizes for the web and email
- Email: 1600–2000 pixels on the long side looks great on any screen and keeps attachments small.
- Blog and website images: 1200–1600 pixels wide is plenty for full-width images; 800 pixels for images inside text.
- Online store product photos: 1000–2000 pixel squares let shoppers zoom in on details.
- Social media: use the presets above – each platform resizes larger images anyway, often with worse results.
Can I make a small image bigger?
You can, but enlarging can't add detail that wasn't captured, so the result looks softer the further you go. Up to about 150% is usually fine for screens. For big prints, start from the largest original you have.