KiiMix Crop & Resize Images Online for Free
Crop and resize images online for free. Choose a crop or size preset in your browser, with no uploads. Download JPEG images.
Popular sizes
YouTube thumbnail cropper
Crop a 16:9 YouTube thumbnail. Export a 3840 × 2160 JPEG.
Open toolInstagram post cropper
Crop an Instagram post to 4:5. Export a 1080 × 1350 JPEG.
Open toolInstagram Story cropper
Crop a 9:16 Instagram Story. Export a 1080 × 1920 JPEG.
Open toolX / Twitter image cropper
Crop a landscape X / Twitter post image to 1200 × 628.
Open toolXiaohongshu cover cropper
Crop a 3:4 Xiaohongshu cover. Export a 1242 × 1656 JPEG.
Open toolTikTok cover cropper
Crop a 9:16 cover image. Export a 1080 × 1920 JPEG.
Open toolHow to use
- 1Select or drop up to 12 images, no larger than 20 MiB each.
- 2Choose a preset or free crop, adjust the crop box, and set the JPEG quality.
- 3Start processing and download each result. Transparent backgrounds become white.
Specifications & output
Remove unwanted edges, change the aspect ratio, or resize an image with a preset. Free crop keeps the area you select. Fixed presets crop to the selected ratio and export at the dimensions shown.
| KiiMix default output | Selected image area, longest edge up to 6000px |
|---|---|
| Default mode | Free crop |
| Fixed presets | General shapes and six platform presets |
| Interaction | Drag the box; resize with its corner handles |
| Export | JPEG; transparent areas become white |
| Free-crop output | Cropped area, limited to a 6000px longest edge |
Crop and resize solve different problems
Cropping removes parts of the frame. Resizing changes its pixel dimensions. A fixed preset does both: it takes the selected crop and scales it to the target. Moving the crop box changes the subject placement without stretching the scene.
Check the crop at a small size
Leave space around faces, products and text. View the result at roughly the size it will appear in a post. If the text is hard to read, make it larger or shorten it. Keep the original so you can crop another version later.
Frequently asked questions
Will a preset stretch my image?
The crop box follows the preset ratio before resizing. Content outside that box is removed. Check the preview and move the box to retain the subject you need.
Does a larger preset make a small image sharper?
No. Enlarging adds pixels but cannot recover missing detail. Use a source at least as large as the selected crop output whenever possible.
Can I undo a crop after downloading?
The downloaded JPEG contains only the exported area. Keep the source file; while the page remains open you can adjust the crop and process it again.