How to Resize an Image Online for Free (to KB, Pixels or for Instagram)
June 14, 2026 · 4 min read
Resizing an image lets you fit it to a website, a social post, or an upload limit. This free resize image online tool changes the exact pixel dimensions, and by shrinking the size you can resize an image in KB toward targets like 100kb or 50kb — all without a watermark.
How to resize an image
- Open the free Resize Image tool.
- Upload your image.
- Enter the target width and height in pixels.
- Click Run and download the resized image.
Frequently asked questions
How do I resize an image without losing quality?
Shrinking keeps images sharp. To resize without quality loss, avoid enlarging beyond the original dimensions.
How do I resize an image to a KB target like 100kb?
Reduce the pixel dimensions here, then run the result through the Image Compressor to hit a specific KB size.
Can I resize an image for Instagram?
Yes — enter the exact pixel size you need (for example a square) and the tool resizes to match.