An image usually looks stretched because its width and height were changed to a proportion that does not match the original. Resizing changes the number of pixels. Cropping changes which part of the image stays in the frame. Treating them as separate decisions makes the result much easier to control.
The PolishTools image resizer and cropper processes the selected file in your browser instead of uploading it to a server. The exported image is newly encoded, however, so it is not an identical copy of the source file.
Check the source aspect ratio first
Aspect ratio describes the relationship between width and height. A 2400×1600 image is 3:2, while a 1920×1080 image is 16:9. If you set the first image to 1200 pixels wide with the ratio locked, its height becomes 800. The second becomes 1200×675.
The safest approach is to keep the ratio lock on and change one dimension. If a publishing slot needs a different ratio, crop the image instead of unlocking both fields and forcing it into shape.
| Source | Half-width result | Ratio |
|---|---|---|
| 2400×1600 | 1200×800 | 3:2 |
| 1920×1080 | 960×540 | 16:9 |
| 1200×1200 | 600×600 | 1:1 |
Decide whether you need resizing or cropping
Resizing keeps the entire picture. If the destination frame has a different ratio, it may leave empty space or be cropped later by the site that displays it. Cropping removes part of the picture so that it fills a specific frame exactly.
To turn a 3:2 photo into a square thumbnail, choose a 1:1 crop first and then resize it to 800×800. Typing 800 into both dimensions without cropping squeezes the whole photograph into a square, making faces and round objects look unnaturally wide or narrow.
- Keep the source ratio when the whole scene must remain visible.
- Crop first when the image must fill a fixed frame.
- Check the crop preview carefully when the subject is close to an edge.
Upscaling does not restore missing detail
When an image is reduced, several source pixels can contribute to one output pixel. When a 400×300 image is enlarged to 1600×1200, the browser has to interpolate details that were never in the file. The pixel count increases, but lost sharpness and texture do not come back.
If a logo or illustration has an SVG source, export the required size from that vector file instead of enlarging a bitmap. For photographs, start with a source that is at least as large as the intended output whenever possible.
Inspect the downloaded file at actual size
The on-page preview shows the crop area; it does not preview JPEG or WebP compression. Download the file and inspect it at 100% scale. Change the quality setting and download again to compare where edges begin to break down.
Browsers can use different image encoders. The same format and quality setting may therefore produce slightly different file sizes or fine detail. If you have a strict size limit, verify the output in the browser you will actually use.
Keep the original file
An export is generated again through the browser canvas. EXIF camera data, location, orientation information, and some colour profiles may be removed in that process. That can be useful for privacy and file size, but it also means the result should not replace an archival original.
GIF input and animated PNG or WebP files are not supported. Use a frame-aware animation editor when motion needs to remain intact.
Example: reduce a 3:2 photograph to 1200×800
Suppose you have a 6000×4000 JPEG from a camera and need an image for the body of a web article.
Steps
- Open the PolishTools image resizer and cropper, then choose the file or drop it into the workspace.
- Leave the ratio lock on and enter 1200 for the width. Confirm that the height becomes 800.
- Leave the crop unchanged because the full photograph should remain visible.
- Export as JPEG or WebP, then open the downloaded file and inspect it at 100%.
- Place the result in the article and check both its rendered size and file size.
Result
You get a 1200×800 still image with the original 3:2 ratio. Keep the source separately if you need its metadata or full resolution.
Frequently asked questions
Can I enter any width and height I want?
Yes, if the two values have the same ratio as the source. If they do not, crop to the target ratio before resizing instead of stretching the picture.
Will making an image larger improve its quality?
No. Interpolation adds pixels but cannot recover detail that was missing from the source. Blur and compression artefacts remain.
Is my image stored on a PolishTools server?
The selected image is processed in your browser and is not uploaded to our server. On a shared computer, remember to remove exported files from the Downloads folder yourself.