How do I crop and resize an image online?
Upload an image and a crop box appears on it. Drag the box to move it and pull any corner to change its size. Pick a ratio such as 1:1, 4:3, 16:9 or 3.5:4.5, or keep it Free. Then choose the output size in pixels. The tool will crop and resize image files in one step and give you a JPG, PNG or WebP. It never uploads your file.
Crop vs resize: what is the difference?
- Cropping removes parts of the picture you do not want, such as extra background, a finger at the edge or other people in a group photo. The remaining part keeps its detail.
- Resizing changes the pixel dimensions of the whole picture, for example from 4000 × 3000 to 800 × 600. Nothing is cut, but the image gets smaller or larger.
Most real tasks need both. For example, a form wants "your photo, 300 × 400 px". You first crop to your head and shoulders in a 3:4 shape, then resize to 300 × 400. Doing it in two different apps wastes time and quality. Here, it is one action.
Aspect ratio presets
The aspect ratio is the shape of the crop: width compared with height. Pick one to lock the box, or keep it free.
| Ratio | Shape | Common use |
|---|---|---|
| Free | Any shape | Removing borders, cropping screenshots |
| 1:1 | Square | Profile photos, Instagram posts |
| 3.5:4.5 (7:9) | Tall rectangle | Passport-size photos |
| 3:4 / 4:3 | Classic photo | Phone photos, prints |
| 16:9 | Wide | YouTube thumbnails, presentations |
| 4:5 | Portrait | Instagram portrait posts |
Steps to crop and resize
- 1Upload your image
Drag and drop, browse, or paste a screenshot with Ctrl+V.
- 2Choose a ratio and crop
Select a ratio, then drag the box. Use the corner handles to zoom. Rotate or flip if needed.
- 3Choose the final size
"Original crop size" keeps every cropped pixel. Or pick a preset or custom pixels.
- 4Download
Choose JPG, PNG or WebP. Turn on a KB limit if the file must stay small.
Tips for a better crop
- Follow the rule of thirds for normal photos: place the subject's eyes about one-third from the top.
- Leave a little space around a face or product. Tight crops can look cramped once resized.
- Crop first, then resize down. Resizing a small crop up to a big size makes it blurry.
- Straighten sideways photos with the Rotate button before cropping.
- Keep the original. Save the source photo so you can make a different crop later.
Privacy and quality
The crop is drawn with your browser's Canvas drawImage function with high-quality smoothing. Your photo stays on your device. There are no watermarks or sign-ups, and there is no limit on the number of images. Learn more about image cropping.
Need a fixed square? Use 300 × 300 or 600 × 600. Need cm or inches? Use Resize to Custom Dimensions. For exam photos with a KB limit, try Photo to 50KB.
Frequently Asked Questions
How do I crop and resize an image online?
Upload it on PhotoKB Crop and Resize Image, choose a ratio, drag the crop box, pick the output size and download.
Can I crop without a fixed ratio?
Yes. Choose Free and drag any edge or corner of the crop box.
How do I make a square crop?
Select the 1:1 ratio. The crop box stays square while you move and resize it.
Can I rotate or flip before cropping?
Yes. Use the Rotate 90° and Flip buttons.
Will the cropped image lose quality?
No, if you keep "Original crop size". Every cropped pixel is kept. Resizing smaller also stays sharp.
Is there a watermark?
No. The tool is free with no watermark or sign-up.
About this tool
Built and maintained by the PhotoKB Editorial Team. We test every tool with real phone photos, scans and PDFs before each update. Exam and portal values are based on public official notifications. PhotoKB is not linked to any exam body, so always confirm current rules on the official website. Last updated: 8 November 2026.