Free Online Image Format Converters — page 6

Both are modern compressed formats designed for the web. WEBP (developed by Google) produces file sizes 25–35% smaller than JPG at equivalent quality and is supported by all major browsers. AVIF achieves even smaller file sizes — roughly 50% smaller than JPG — but encoding is slower and browser support, while improving, is not fully universal. For most production use, WEBP is the practical choice. AVIF is worth using when your audience is on modern browsers and every byte of file size matters.

PNG is the right format for images with transparency, logos, screenshots, text overlaid on a solid background, or graphics with sharp edges and flat colors. JPG uses lossy compression that creates visible artifacts around hard edges and blurs fine text. PNG uses lossless compression that preserves detail exactly — at the cost of larger file sizes. For photographs with no transparency where file size matters, JPG or WEBP is more appropriate.

PNG, WEBP, AVIF, and GIF all support transparency. JPG does not — transparent areas become white or black when saved as JPG. TIFF can store alpha channels but most web applications do not render TIFF transparency. If you convert a PNG with transparency to WEBP, the transparency is preserved. If you convert to JPG, it is lost. Always check the output format when transparency is part of the design.

WEBP for almost everything: photos, illustrations, UI screenshots. It is supported by all modern browsers, loads faster than JPG at equivalent quality, and supports transparency unlike JPG. For cases requiring older browser support, JPG (photos) and PNG (graphics with transparency) are the safe fallback. Use AVIF if your analytics confirm your audience is on very recent browsers and maximum compression is a priority.

The upload limit is 20 MB per file. This covers most working files — web images, social assets, print-ready PNGs, and HEIC photos from a recent smartphone. Very large files such as raw 600 DPI scans can exceed the limit; resize or reduce resolution before converting in those cases.