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Free Online Image Format Converter
Our browser-based image converter lets you convert images between PNG, JPEG, WebP, and BMP formats instantly, without uploading anything to a server. Your files stay on your device the entire time, ensuring complete privacy and fast processing. Whether you need to convert a screenshot to JPEG for email, transform a photo to WebP for your website, or save an image as BMP for legacy software, this tool handles it all with just a few clicks.
PNG vs JPEG vs WebP vs BMP: Which Image Format Should You Use?
PNG (Portable Network Graphics) is the go-to format when you need lossless compression and transparency support. It is ideal for screenshots, logos, icons, and any image with sharp edges or text. PNG files tend to be larger than JPEG or WebP because no image data is discarded during compression.
JPEG (Joint Photographic Experts Group) uses lossy compression, which makes it excellent for photographs and complex images with many color gradients. JPEG files are significantly smaller than PNG, but they do not support transparency and each re-save can introduce additional compression artifacts. Adjusting the quality slider lets you find the right balance between file size and visual fidelity.
WebP is a modern image format developed by Google that provides both lossy and lossless compression. WebP files are typically 25-35% smaller than equivalent JPEG or PNG files while maintaining comparable visual quality. It supports transparency (like PNG) and animation (like GIF). WebP is now supported by all major browsers, making it an excellent choice for web optimization and faster page load times.
BMP (Bitmap) is an uncompressed raster image format that stores pixel data without any compression at all. This results in very large file sizes but guarantees zero quality loss. BMP is mainly used in legacy Windows applications, embedded systems, or workflows where uncompressed raw pixel data is required.
Understanding Image Compression and Quality
Image compression reduces file size by eliminating redundant data. Lossless compression (used by PNG and WebP lossless) preserves every pixel exactly, while lossy compression (used by JPEG and WebP lossy) discards information the human eye is less likely to notice. When converting to JPEG or WebP, the quality setting controls how aggressively data is discarded. A quality of 80-92% typically produces files that are visually indistinguishable from the original while achieving substantial size reduction. Lower quality values create smaller files but may introduce visible artifacts, especially around sharp edges and text. For web publishing, converting images to WebP at 80-85% quality often delivers the best combination of small file size and high visual quality, helping your pages load faster and improving Core Web Vitals scores.