Need to resize an image pixel by pixel? This free tool lets you change the resolution of an image by entering an exact width and height, with an aspect-ratio lock so your picture never looks stretched. Everything runs right in your browser, so your photo is never uploaded to a server.

How to Use the Resize Image by Pixel Tool

1. Click the upload box or drag and drop your image into it.
2. Check the original dimensions and file size shown on the left.
3. Enter your target width and height in pixels. Keep “Lock aspect ratio” on if you want to change the resolution of the image without distorting it.
4. Click Resize Image and review the before-and-after comparison.
5. Click Download Resized Image to save the result to your device.

Frequently Asked Questions

How do I change the resolution of an image?

Upload your photo, then type the exact width and height you want in pixels. This tool redraws the image at that new pixel size right in your browser and lets you download the result immediately.

How do you change picture resolution without distorting it?

Keep the aspect ratio lock switched on. When it is on, changing the width automatically recalculates the height to match your original picture’s proportions, so nothing looks stretched or squashed.

What is the difference between width and height when resizing?

Width is the horizontal pixel measurement and height is the vertical pixel measurement. Together they define the total resolution of your image, and changing either one changes the picture’s overall pixel dimensions.

Can I use this as an online megapixel converter?

Yes. Megapixels are simply width multiplied by height divided by one million, so entering new width and height values here also changes your image’s total megapixel count. Will resizing reduce my image quality?

Reducing an image to smaller pixel dimensions usually keeps it looking sharp. Enlarging an image well beyond its original size can make it look softer or blurry, since no new detail is being added.

Does this work for PNG files with the correct image pixel size?

Yes. PNG, JPG, WebP and GIF files are all supported. PNG transparency is preserved when you resize a PNG, so you get a correctly sized file with the same background transparency.