Quick Answer
Will compression reduce image quality? Lossless mode never reduces quality. Medium and Maximum modes use lossy compression which may introduce very subtle changes at high zoom, but are typically invisible at normal viewing sizes.
Frequently Asked Questions
Lossless mode never reduces quality — it removes only redundant data. Medium and Maximum modes use lossy compression, which may introduce very subtle artifacts at high zoom levels but is typically invisible at normal viewing sizes.
JPG, PNG, WebP, GIF, and BMP are supported for input. The output format matches the input. To convert formats, use the Image Format Converter tool.
Files up to 50MB are supported. Very large files may take 5–15 seconds to process depending on your device.
No — all compression runs locally in your browser. Your image never leaves your device, making this tool safe for confidential or sensitive images.
PNGs are already losslessly compressed by default. For significant size reductions, try Maximum mode or convert to WebP using the WebP Converter for 25–35% better compression than PNG.
Currently the tool processes one image at a time. For batch needs, process each image sequentially — the tool is fast enough that 10–20 images takes just a few minutes.