Resize a photo without losing the important details
An upload form can reject a perfectly good picture because its dimensions or file size do not match the form. Those are two different problems. Changing JPEG quality affects the file size; resizing changes the number of pixels. Work out which limit is failing before you change both.
Read the limit before opening the editor
Write down the requested file type, width, height and maximum size. A limit expressed in KB or MB is a storage limit. A limit such as 400 × 280 is a pixel dimension. A printed size in millimetres needs a separate print-resolution decision. Do not assume that a smaller file automatically has the correct shape. Keep the original image so that you can restart if a small export becomes too soft.
Choose a crop or preserve the whole image
Open Photo Studio and choose your picture. If the receiving form needs the whole image, keep the aspect-ratio lock on while changing a dimension. A 1000 × 700 source has the same proportions as 400 × 280, so it can be reduced without stretching. If the target shape differs, use the framing controls and inspect the edges. Moving a face, signature or text outside the frame cannot be repaired by raising export quality.
Use a format that suits the picture
JPEG is a useful starting point for ordinary photographs when the form accepts it. PNG is preferable when you need transparency or sharp flat-colour graphics, but a photograph saved as PNG may be larger. WebP can be compact, although the receiving site must accept it. Renaming a filename from .png to .jpg does not convert the file. Select the actual export format in the editor.
Reduce the size in controlled steps
First set the required dimensions. Export once and inspect the result at a normal viewing size, including faces and small text. If the file is still too large, try a lower JPEG quality or the target-size controls. Allow resizing only when the receiving form permits fewer pixels. A target size is not a promise of acceptable quality; a detailed photograph and a simple graphic compress differently even at the same dimensions.
Check the saved file, not just the preview
Open the downloaded file and inspect its pixel dimensions and size in your file viewer. Make sure its extension matches the format you chose. Check that the image has the intended orientation and that no text, hair or background boundary was accidentally cropped. If the form rejects it, read the form's current error before compressing again. Repeatedly editing an already-compressed JPEG can lose detail; return to your original for another attempt.
When the picture is for an official document
Use the receiving authority's current photo instructions. A dimension preset helps with sizing but does not verify lighting, pose, background, recency or permitted editing. Avoid beauty effects or changes that alter identifying features. If the authority rejects digital alterations, use a properly captured original instead of trying to correct it with stronger filters.