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A 300KB limit means the image must stay at or below the file size accepted by the website or application. To compress image to 300kb, the file needs enough data reduction to meet that limit while keeping the important visual details intact.
You can target the required size directly with an image compression tool:
Choose the photo you want to optimize.
Set the target file size to 300KB.
Allow the image to be processed.
Save the result and check its final size.
A large, high-resolution photo may still remain above 300KB after compression. In that case, crop unnecessary areas or reduce the image dimensions before processing it again. Fewer pixels mean less visual data for the file to store.
For photographs, JPEG is often a practical format when a smaller file is needed. PNG can remain larger because it preserves image data differently, especially when transparency or lossless quality is involved.
If you need a smaller file limit, you can compress an image to 200KB instead.
After saving the compressed image, check its file details on your device. On a computer, open Properties. On a phone, use the image or file information option. Make sure the file is 300KB or smaller and follows any other format or dimension requirements listed by the website.