Image Resizer | How to use and interpret results
Change an image's pixel dimensions and export a PNG. With aspect-ratio lock enabled, height follows width to help avoid unintended stretching.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Select a file, set the new width and check the ratio lock. Unlocking permits an independent height, which can deliberately change the original proportions.
Results and examples
A 1200 by 800 photo resized to width 600 with the lock enabled becomes 600 by 400. Enlarging interpolates pixels rather than recovering details never captured.
Worked example
A 1200 by 800 photo resized to width 600 with the lock enabled becomes 600 by 400. Enlarging interpolates pixels rather than recovering details never captured.
Limitations
- Upscaling does not guarantee sharper or more detailed imagery.
- A PNG output may be larger than the input JPEG.
Fields
| Field | Guidance and constraints |
|---|---|
| Image | Check the unit and format displayed beside this field. |
| Width (px) | Check the unit and format displayed beside this field. |
| Height (px) | Check the unit and format displayed beside this field. |
| Keep aspect ratio (based on width) | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
What happens when a 1200-by-800 image is halved in width?
A 1200 by 800 photo resized to width 600 with the lock enabled becomes 600 by 400. Enlarging interpolates pixels rather than recovering details never captured.
Will enlarging restore image quality?
Upscaling does not guarantee sharper or more detailed imagery. A PNG output may be larger than the input JPEG.
