Compress Image to 400KB

400KB is a practical limit for product photography on e-commerce platforms, featured images on high-quality blogs and images shared in professional social media posts. At this size, images retain near-original quality at typical display sizes and load quickly on broadband connections. Some online marketplaces cap seller product images between 350KB and 500KB.

At 400KB, compression artefacts are virtually invisible. The encoder runs at high quality settings for all but the largest source files, preserving fine texture detail such as fabric weave, product labels and fine print. For most phone photos, the compressed output will be identical in appearance to the original at normal viewing sizes.

Yes, WebP will produce a noticeably sharper image than JPEG at the same file size. At a 400KB budget, a WebP encoder can use a significantly higher quality setting than JPEG because of its more efficient compression algorithm. If the platform you are uploading to supports WebP, always choose it for better results.

Yes. The tool accepts images of any resolution. A high-resolution product photo taken with a DSLR or a recent phone camera can be compressed to 400KB without resizing the pixel dimensions in most cases. If the source file is very large, the binary search algorithm finds the highest quality setting that still produces a file under 400KB.