Read both limits before editing

An upload form can restrict file format, pixel dimensions and encoded file size separately. Write down all three requirements before processing. A small-looking preview can still be a large file, and a compressed photograph can have the wrong dimensions.

Keep the original. Work on a copy, and use Image Dimensions or Image Information to inspect it. If the destination accepts only JPG, start with that constraint rather than exporting a transparent PNG and expecting the same byte savings.

Resize when the pixel count is unnecessary

If a 4000 × 3000 image only needs to be 1600 × 1200, proportional resizing reduces pixel count from 12 million to 1.92 million. That is 84% fewer pixels, not a guaranteed 84% reduction in encoded bytes. Image content and encoding still determine file size.

If the destination requires another aspect ratio, crop or pad before resizing. Do not squeeze a portrait into a landscape rectangle just to reach a smaller file: the subject’s proportions will change. Review the selected area before processing.

Compare quality settings against the actual output

Open Compress Image with the correctly sized copy. Balanced starts at 82% quality; Light starts at 90%, Strong at 65% and Maximum at 45%. Treat them as starting points. Process one pass and read the exported size before choosing another setting.

For an opaque photograph, compare JPG or WebP when the destination permits both. PNG can remain large because its encoding does not use the JPG quality trade-off. Inspect fine lettering, hair and gradients before accepting a stronger compression setting.

Verify the file you will submit

Check the downloaded file’s size, dimensions and extension. Compare the value with the form’s stated limit; if KB interpretation matters, follow the destination’s own definition. Reopen the file to confirm it has not introduced an unwanted background or unreadable text.

This ImgProcess version does not guarantee exact 50 KB, 100 KB or 200 KB output. If the available controls cannot produce an acceptable copy under the limit, use a more appropriate source or ask the destination for another submission method. Do not claim a successful target result from a quality setting alone.