Image Compressor — Free Online

A normal browser Canvas PNG export is lossless and ignores the quality setting, so an already optimized PNG often came back the same size or larger. This compressor now defaults PNG output to Smart PNG: it builds an optimized colour palette (the TinyPNG/pngquant approach), keeps transparency, and commonly reduces PNG→PNG files by 40–85%. If you manually choose Lossless PNG, 0% can still be correct for a file that was already perfectly optimized.

Typical camera/phone JPGs shrink 70–90% at 80% quality, especially with a dimension cap. PNG photos and colourful screenshots often shrink 40–85% with Smart PNG; tiny already-quantized logos may shrink less. WebP frequently gives the smallest result.

Smart PNG reduces the number of colours to an optimized palette, so it is technically lossy — similar to TinyPNG. At the default 80% setting (about 205 colours) most screenshots, graphics and web photos look virtually identical. Use Lossless PNG for pixel-perfect masters, medical/scientific images, or any file where exact pixel values matter.

JPG for ordinary photos (small, universal). Smart PNG when the result must remain PNG with transparency. Lossless PNG for pixel-perfect assets. WebP usually gives the smallest website files with transparency support.

Absolutely — that's the most popular use. Compress to ~80% quality, cap width at 1600–1920px, and choose WebP for the smallest pages, or Smart PNG where PNG is required.

Never. Compression happens locally in your browser. The small PNG engine is downloaded once from a CDN, but your image data itself is never sent to a server.