How Can I Compress an Image to 1 MB?
Getting an image under 1 MB usually requires a combination of appropriate dimensions, format and compression quality. There is no single quality percentage that guarantees 1 MB for every image.
What to do
Check the original dimensions first. If the image is oversized, resize it. Then export as JPG or WebP when suitable and adjust quality until the file falls below the required limit. The simplest next step is to Compress Image. If the issue is actually about resize image, see Resize Image as well.
Why this happens
Image problems often come from three separate variables: pixel dimensions, encoded file size and file format. Changing one does not automatically solve the others. A very large photo may need resizing even when its format is already JPG; a transparent graphic may need PNG or WebP even when the file size is acceptable; and an upload limit may be measured in megabytes rather than pixels.
Before editing, check the requirements of the place where the image will be used. That gives you a concrete target and reduces unnecessary quality loss. When possible, keep the original file and create a delivery copy for the specific destination.
Common questions
Why can two 1,000px images have different file sizes?
Pixel dimensions are only one factor. Image detail, format, compression and metadata can produce different file sizes.
Should I use PNG to reach 1 MB?
Not usually for photographs. JPG or WebP often produces smaller photographic files, while PNG is useful for lossless graphics and transparency.
What if the image is still above 1 MB?
Reduce dimensions modestly, then compress again. Avoid destroying quality just to meet a number when a smaller pixel size solves the problem more cleanly.