Read the upload requirement before changing the file
A form may reject an image because of its file size, format or pixel dimensions. These are separate limits. If the form requires JPG below a stated size, a smaller WebP file may still be rejected because its format is not accepted.
Write down the permitted formats and the maximum size shown by the destination. If it also specifies dimensions, record those too. Keep the original image untouched so you can try a different approach without repeatedly processing an already compressed copy.
Try one compression pass
Open the WebHolick Image Compressor, choose an image and select Compress image. Compare the original and result previews, inspect the displayed size and download the result.
As checked on 29 October 2026, the tool normally attempts WebP compression while preserving pixel dimensions. It uses a browser-supported fallback when needed and keeps the original if the attempted output would be larger. It does not provide a target-size field or promise an exact result such as 100 KB.
That distinction matters: “Original kept” means the tool avoided a larger replacement, not that it reduced the file below your destination’s limit.
Check the downloaded file, not only the percentage
A large percentage reduction can still leave a file above the limit. Conversely, a modest reduction may be enough. Look at the actual final size and extension, then upload that downloaded file rather than accidentally selecting the original again.
If the destination needs JPG or PNG, use the Image Converter to choose that format. Conversion can increase file size, so inspect the new output again. Renaming a WebP file with a .jpg extension does not convert its contents.
If the image still fails, reduce the right thing
The current compressor has no resize control. If your source is far larger in pixel dimensions than the destination needs, resize a copy in an image editor, then try one further compression pass. Crop unnecessary margins only when doing so does not remove required information.
- Check small text and thin edges at a useful viewing size.
- Keep transparency when the destination needs it.
- Recheck the exact format and size after every conversion.
- Do not assume an animated file will remain animated; this tool processes a single frame.
- For sensitive documents, follow your organisation’s handling rules.
For website assets, plan image dimensions during development instead of treating every upload as an emergency. A repeatable export process is easier to maintain than repeatedly compressing the same files by trial and error.