Resize Image
Exact pixel dimensions, aspect ratio kept.
- Files stay on your device
- No upload, no waiting
- No sign-up, no watermark
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All image toolsQuestions
Should I set both width and height?
Usually not. Enter just a width and the height is derived from the original aspect ratio, so the image stays correctly proportioned — which is what you want almost every time. Setting both tells the tool to fit the image into a box whose shape may not match, which is when the fit modes matter.
What is the difference between fit, fill and stretch?
Fit inside keeps the whole image within the box and preserves the aspect ratio, so the result may be smaller than the box in one dimension. Fill and crop fills the box completely and trims the overflow evenly from both sides — right for avatars and cover images. Stretch forces exact dimensions and distorts the image, which is almost never what you want.
Can I make an image bigger?
You can, but it will not add detail. Upscaling interpolates between existing pixels, producing a larger and softer version of the same image rather than a sharper one. If you need more resolution, go back to a higher-resolution original. AI upscalers can invent plausible detail, but it is invented, which matters if the image is evidential.
What size should I export for a website?
Roughly twice the display size, then compress harder to compensate — a 2× image at quality 60 usually looks better and weighs less than a 1× image at quality 90. As a starting point: 1600px wide for blog body images, 1200 × 630 for social previews, 400 × 400 for avatars.
Does resizing change the file format?
No. The original format is kept where the browser can encode it — PNG stays PNG, JPEG stays JPEG, WebP stays WebP. Formats the browser cannot write are saved as PNG so nothing is silently mislabelled. To change format deliberately, use one of the converters instead.
About resize image
Set one dimension, not both
If you enter only a width, the height is derived from the original aspect ratio and the image stays correctly proportioned. That is what you want almost every time. Enter both and you are telling the tool to fit the image into a box whose shape may not match — which is where the three fit modes come in.
- Fit inside — the whole image fits within the box and the aspect ratio is kept. The result may be smaller than the box in one dimension.
- Fill and crop — the box is filled completely and the overflow is trimmed evenly from both sides. Right for avatars and cover images, where the box must be exactly filled and losing the edges is acceptable.
- Stretch — the image is forced to the exact dimensions and the aspect ratio is distorted. Almost never what you want, but occasionally required by a system that demands exact pixels.
Do not upscale
Enlarging an image cannot add detail that was never captured. A browser or a canvas upscale interpolates between existing pixels, which produces a softer, larger version of the same image — not a sharper one. If you need a bigger image, go back to a higher-resolution original. AI upscalers can invent plausible detail, but they are inventing it, which matters if the image is evidential.
Common sizes worth knowing
| Where | Size |
|---|---|
| Full-width hero on a 1440px layout | 2880 × 1200 (2× for retina) |
| Blog body image | 1600 wide |
| Open Graph / social preview | 1200 × 630 |
| Instagram square | 1080 × 1080 |
| Avatar | 400 × 400 |
Export at roughly twice the display size for high-DPI screens, then compress harder to compensate. A 2× image at quality 60 usually looks better and weighs less than a 1× image at quality 90.
Related
Browse the rest of the image tools, or reduce file size without changing dimensions using the image compressor.