Image Compressor

Re-encoding an already optimized asset can undo specialized compression or switch formats unfavorably. High quality settings plus PNG output are common culprits. Lower quality or change format intentionally, and compare the Saved stat. Growth after compress is a real scenario, not a paradox. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

Low quality aggressively quantizes and shrinks JPEG/WebP hard with visible artifacts. High quality preserves more detail at larger sizes. Neither equals a bit-identical original after Canvas re-encode. Sweep the slider and judge at 100% zoom for your use case. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

Selecting something outside JPG, PNG, or WebP should fail the decode or reject in the UI. Switch to a supported still image format. If nothing updates, the browser never produced a drawable bitmap. Format mismatch is the scenario to rule out first. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

Compression targets file weight via codec quality at roughly the same dimensions. Resizing changes width and height, which often reduces bytes as a side effect. For performance, resize oversized photos first, then compress. Using only one lever leaves easy gains on the table. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

This browser compressor is instant and private for quick wins. Dedicated apps expose finer codec knobs, palette quantization, and batch folders. Use the page for one-off confidential shots; use desktop suites for catalog-scale pipelines. Different tools for different volumes. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

If you stay on a transparency-aware output path, alpha can survive. Exporting to JPEG will flatten onto an opaque background. Watch the preview for unexpected mats. Alpha loss is usually a format choice scenario, not random corruption. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

Canvas still compression typically addresses a single raster frame. Animations need specialized encoders. Expect a static result if you force an animated source through a still pipeline. Choose an animation-aware tool for multi-frame assets. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

The quality loop is designed to run through browser Canvas locally with local download. That avoids mandatory SaaS uploads for basic optimization. You remain responsible for where you send the downloaded file next. Clear the workspace after sensitive compressions. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.

Decode failed, so compression cannot proceed on a valid bitmap. The file may be corrupt, truncated, or an unsupported type renamed with a jpg extension. Replace it with a known-good export. Broken preview is the hard stop scenario before you chase quality slider myths. In practice, re-run Image Compressor on a smaller sample after each change so you can see which input detail caused the mismatch. Keep the original nearby until you trust the export.