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In target mode the tool binary-searches JPEG/WebP quality until the encoded blob fits under your max KB. If the image is still too large at the lowest quality, it scales dimensions down in steps and retries. PNG originals switch to WebP for target mode because lossless PNG rarely hits aggressive KB caps.

Quality mode is best when you want predictable sharpness (for example 80–90% for Shopify catalog photos). Target KB mode is best when a marketplace, theme, or email template enforces a hard size limit—set 100–300 KB and let the binary search find the highest quality that fits.

Moderate compression usually improves load speed, which helps Core Web Vitals and mobile conversion. Avoid crushing hero zooms below ~70% quality or aggressive downscaling unless required. Pair this compressor with the Universal Image Resizer so you hit the right pixels first, then shrink bytes.

No. Encoding uses HTML5 Canvas toBlob entirely in your tab. Individual downloads and ZIP packing with JSZip also stay on-device—ideal for unreleased catalog shots.

Original keeps the source family when possible (JPEG stays JPEG, WebP stays WebP; PNG stays PNG in quality mode). Force JPEG for maximum compatibility or WebP for smaller files with modern browsers. For PDFs of documents, use Compress PDF instead.