Choose the output format for the image. Different formats have their own advantages and use cases.
Auto Compress: This option automatically applies a suitable compression strategy based on the input format:
- JPG inputs are compressed as JPG.
- PNG inputs are compressed using the PNG (Lossy) method.
- WebP inputs are compressed using the WebP (Lossy) method.
- AVIF inputs are compressed using the AVIF (Lossy) method.
- HEIC inputs are converted to JPG.
You can also manually select a format below based on your specific needs. Here’s a detailed guide to each option:
JPG: The most popular image format, though it doesn't support transparency. When converting from an uncompressed PNG, it can reduce file size by an average of 90%. At a quality setting of 75, the quality loss is often imperceptible. If you don't need a transparent background (which is true for most photos), converting to JPG is usually the best choice.
PNG (Lossy): Supports transparency with some quality loss, reducing file size by an average of 70% compared to an uncompressed PNG. Choose this only if you need a transparent background in the PNG format. Otherwise, JPG offers better quality for a smaller size (without transparency), and WebP (Lossy) provides better quality, smaller size, and transparency, making it a superior alternative if the PNG format isn't a strict requirement.
PNG (Lossless): Supports transparency with no quality loss. Reduces file size by an average of 20% compared to an uncompressed PNG. However, if the PNG format is not a strict requirement, WebP (Lossless) is a better choice as it offers smaller file sizes.
WebP (Lossy): Supports transparency with slight quality loss. Reduces file size by an average of 90% compared to an uncompressed PNG. It's an excellent replacement for PNG (Lossy), offering better quality and smaller sizes. Note: WebP is not supported on some older devices.
WebP (Lossless): Supports transparency with no quality loss. Reduces file size by an average of 50% compared to an uncompressed PNG, making it a superior replacement for PNG (Lossless). Note: WebP is not supported on some older devices.
AVIF (Lossy): Supports transparency with slight quality loss. As the successor to WebP, it offers an even higher compression rate, reducing file size by an average of 94% compared to uncompressed PNG. As a cutting-edge format, AVIF provides excellent quality at very small file sizes. However, browser and device compatibility is still limited. This format is best for advanced users or when you are certain the target devices support it.
AVIF (Lossless): Supports transparency with no quality loss. Compared to an uncompressed PNG, the file size reduction is not significant, and in some cases, may even increase. Unless you have a specific need for lossless AVIF, PNG (Lossless) or WebP (Lossless) are generally better options.