What This Tool Does

It changes the width and height of your image to whatever dimensions you need. Enter the target size, lock the aspect ratio to prevent distortion, and download the resized version. Everything runs in your browser.

This comes up constantly. A profile picture needs to be 400x400. A banner requires 1200x628. A thumbnail must be exactly 300x200. Getting the dimensions right without distorting the image is what the aspect ratio lock handles. When you change the width, the height adjusts automatically to keep the proportions correct.

How to Use It

• Click Choose Image and select your file.
• The original dimensions load automatically into the width and height fields.
• Enter your target width. With aspect ratio locked, height updates automatically.
• Uncheck the lock if you need to set width and height independently.
• Click Resize Image and download the result.

Resizing Up vs. Resizing Down

Resizing to smaller dimensions always works well. The tool reduces the number of pixels while keeping the image looking sharp.

Resizing to larger dimensions is different. When you scale an image up, the tool has to invent pixels that were not in the original. This is called interpolation, and it results in some softness or blurring, especially at large scale increases. If you need a larger version of an image, start with the highest resolution original available and scale down from there rather than scaling up.

For most practical uses, like fitting an image to a specific container on a website or preparing a file for a platform that specifies exact dimensions, resizing down to the target size is the right approach.

Common Uses

• Resizing profile pictures to meet platform requirements like 400x400 or 200x200
• Preparing banner images for websites, blogs, or social media
• Creating thumbnails from larger images
• Resizing product photos before uploading to an e-commerce store
• Reducing image dimensions before attaching to an email or document

Aspect Ratio Explained

Aspect ratio is the relationship between an image's width and height. A 1200x800 image has a 3:2 ratio. If you resize it to 600 wide with the aspect ratio locked, the height automatically becomes 400, keeping the same proportions.

Without the lock, you can set any width and height independently. This is useful when you need an exact size that does not match the original proportions, like turning a landscape photo into a square thumbnail. The image will stretch or compress to fit the new dimensions, which changes how it looks. For most cases, keeping the lock on produces the best result.

Frequently Asked Questions

What happens if I resize to larger dimensions than the original?

The image scales up using interpolation. Quality may soften at large increases. Always start with the highest resolution original available.

Can I set exact pixel dimensions?

Yes. Enter any values you need in the width and height fields.

Does it support PNG?

Yes. Both JPG and PNG are accepted as input. The output is JPG.

Will the aspect ratio change if I enter both values manually?

Only if the lock aspect ratio checkbox is unchecked. With it on, one value adjusts automatically when you change the other.

Can I resize to centimeters or inches instead of pixels?

The tool works in pixels only. Convert your target dimensions to pixels first using your target DPI.

Does resizing change the file size?

Yes. Smaller dimensions produce smaller files. Larger dimensions produce larger files.