Does resizing preserve image quality?

Scaling down generally produces a good-quality result. Scaling up (enlarging beyond the original size) will cause the image to appear blurry, as no new detail can be invented. For JPEG and WebP, the quality slider controls compression after resizing.

What does locking the aspect ratio do?

When the aspect ratio is locked, changing the width automatically updates the height (and vice versa) to keep the same proportions as the original image. Unlock it to enter arbitrary width and height values, which may stretch or squash the image.

Is my image uploaded to a server?

No. Resizing is done entirely in your browser using the HTML5 Canvas API. Your image is never uploaded to any server.

What is the maximum output size?

The tool limits output dimensions to 8000 × 8000 px to avoid browser memory issues. For most use cases this is more than sufficient.

Free Tool

Image Resizer

Resize JPEG, PNG, and WebP images to exact pixel dimensions in your browser. Lock aspect ratio or enter custom width and height.

Drop an image here or click to browse

Supports JPEG, PNG, WebP

Aspect ratio lock

When aspect ratio is locked, changing width automatically adjusts height proportionally (and vice versa), preventing distortion.

How to use

Drop an image or click to browse.
Enter the desired width and height (or pick a preset).
Click Resize — the output appears with a file size comparison.
Click Download to save the resized image.

All resizing runs in your browser using the Canvas API — no images are uploaded to any server.

Frequently Asked Questions

What formats are supported?: JPEG, PNG, and WebP. Output is always in the same format as the input.
Is upscaling supported?: Yes. You can resize to dimensions larger than the original, though this will reduce image quality due to upsampling.

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