Image Format Converter

Picking the right output format depends on what the image contains and where it will be used. JPEG is the universal choice for photographs — it compresses natural images well and is supported everywhere, but does not preserve transparency. PNG is lossless and supports alpha channels, which makes it ideal for logos, icons, screenshots, and any image with sharp edges or text. WebP combines the best of both: lossy or lossless compression, transparency support, and 25–35% smaller files than JPEG at similar visual quality. AVIF offers the best compression on the modern web but encoding it requires a recent Chromium browser. Use the Image Compressor to fine-tune size after converting, or the Quality Analyzer to compare visual quality side by side.

Drop or select up to 50 images and the tool converts them all to the same output format, quality, and background settings. Each file is converted sequentially in your browser, with a live progress row showing the source format, output format, original size, and converted size per image. Transparency is handled per file — only the images that actually have an alpha channel get the background fill when converting to JPEG. When everything finishes you get a one-click ZIP of every converted file, plus individual download links if you only need some of them. Because conversion runs locally — even in batch mode — none of your images is ever uploaded to a server. To shrink the results further, run them through the Image Compressor.

Converting a transparent PNG to JPEG always involves flattening the alpha channel against some background color. Default web tooling often produces a black background, which is rarely what you want. This image format converter detects when the source has transparency and asks for an explicit fill color — white by default, fully customizable via the color picker. The same applies when converting WebP or AVIF with alpha to JPEG. If you want to keep transparency, convert to PNG or WebP instead. To analyze whether your PNG actually contains transparency, run it through the EXIF Checker or open the JPEG Structure tool for JPEGs.

Image weight is the single largest contributor to slow page loads on most websites. Converting JPEG and PNG to WebP typically cuts payload by a quarter to a third without any visible quality loss. AVIF goes further — often 50% smaller than JPEG at the same perceived quality — but encoding support varies. Google PageSpeed and Lighthouse explicitly flag legacy formats as a Core Web Vitals issue. If you are preparing assets for a website, batch-convert your images to WebP first and resize them with the Image Resizer to match display dimensions. Then run them through the Image Compressor for further size reduction.