At 70–85% quality, most people cannot tell the difference between the original and compressed image when viewing on screen. Below 50%, you will start to notice pixelation or color banding in detailed areas, especially in JPEGs.

No. Image compression runs entirely in your browser using client-side JavaScript. Your photos are never uploaded to or stored on any server. This makes the tool safe for private, personal, or confidential images.

Yes, most image compressor tools support batch uploads — you can upload several images at once and they will all be compressed with the same settings, then downloaded as a zip file or individually.

There is no hard limit set by the tool itself. However, very large files (50MB+) may be slow to process depending on your device's memory and browser. For RAW photos or files above 20MB, consider splitting the task or using a desktop app.

Yes. PNG compression is lossless — the tool removes hidden metadata, color depth, and redundant data without affecting the visible pixels. The file size reduction for PNGs is typically 20–50% without any quality loss.

Instagram: 1080 x 1080px (square), 1080 x 1350px (portrait), 1080 x 566px (landscape). Facebook: 1200 x 630px (shared post). Keep file size under 1 MB for fastest platform processing.

Scaling down (making smaller) generally maintains quality well. Scaling up (making larger) can cause blurriness because the tool must invent pixels that weren't in the original — this is called upscaling and always results in some quality loss.