Free Image Compressor: WebP, JPEG

No. Compression uses your browser's graphics engine: your files never leave your device and nothing is kept after you close the page. That makes it handy for unpublished product photos, client visuals or internal documents.

WebP usually offers the best size-to-quality ratio and is supported by all modern browsers. JPEG remains universal for photos; PNG is lossless and keeps transparency, but it is often heavier.

80% is a good balance for photos; go down to 60% for thumbnails. Quality does not apply to PNG, which is lossless.

No: re-encoding strips EXIF metadata (camera, GPS coordinates), which also makes the file lighter. Keep your originals if you need it.

This happens with files that are already highly optimized or when converting to PNG. The tool shows it clearly: keep the original in that case.

Choose the WebP format and a quality around 80%: the difference is rarely visible to the naked eye, while the file size drops sharply. Also resize the image to its actual display size: there is no point sending a 4,000-pixel-wide image for a visual displayed at 1,200. For strictly lossless compression, keep PNG at the cost of a heavier file, then compare the resulting size with the original before downloading.