Start with the final display size
If an image will only appear inside a 1200 px content area, exporting a 4000 px file usually adds weight instead of clarity. Resize for the place where the image will actually be seen.
Keep the aspect ratio
Most blurry results come from stretching an image into a box that does not match the original proportions.
- Set one dimension when you can.
- If you set both, keep the same ratio as the source.
- Do not enlarge a small source image and expect it to become sharp.
Choose the format after resizing
JPEG is usually best for photos. PNG is better for screenshots, graphics, and transparent edges. WebP is a strong option when you want smaller files for modern browsers. If you want to test the result immediately, use the Resize Image tool.
Check the important details before exporting
Zoom to 100% and look at text, faces, or hard edges. If those details already look soft, resizing alone will not repair the source. In that case, start from a larger or cleaner original file.