Image Format Converter

What is the image format converter?

An image format converter changes a picture from one file type to another — JPG, PNG, WebP or AVIF — without changing what the image shows. Each format is a different way of packaging the same pixels, and each has strengths: JPG is universal and small for photographs but can't store transparency; PNG is lossless and keeps transparent areas, which makes it ideal for logos and screenshots; WebP and AVIF are modern web formats that produce noticeably smaller files at the same visual quality, which is why they matter for fast-loading websites. This tool lets you drop in one image or a whole batch, pick the target format, and download the converted files — individually or bundled as a single ZIP. Everything happens inside your browser using the built-in canvas engine (with a lazy-loaded WebAssembly encoder for AVIF when your browser can't encode it natively), so your images are never uploaded to a server. That makes it fast, private and free, with no watermarks and no sign-up.

How it works

Add images by dragging them in, choosing files, or pasting from the clipboard. Each one is decoded onto a canvas at full resolution. You then choose the format to convert to. For the lossy formats — JPG, WebP and AVIF — a quality slider trades file size against visual fidelity; PNG is lossless, so the slider is hidden when it's selected. Because JPG can't hold transparency, converting a transparent PNG or WebP to JPG would otherwise turn the see-through areas black, so the tool automatically fills them with white (or a colour you choose with the background-fill picker). There's an optional resize step to cap the largest dimension before converting, which is handy for shrinking huge camera images down to web size in the same pass. When you click Convert, each image is processed in turn with a progress bar, and the result shows a live before/after size comparison so you can see exactly how much you saved. Animated GIFs and animated WebP files are converted using their first frame only — a clear notice appears when the tool detects them, since a still image can't preserve animation. Finished files download one at a time, or all together as a ZIP for batches.

Worked example

Say you exported ten product photos as PNGs straight from a design tool and they total 45 MB — far too heavy for a product page. You drag all ten in, choose WebP as the target, set quality to about 80%, and click Convert. Each PNG is re-encoded as WebP; the before/after readout shows each dropping from several megabytes to a few hundred kilobytes, and the total falls to well under 5 MB with no visible loss. You click Download all as ZIP and get a single archive of web-ready images. Later you need one of them as a JPG for an email that doesn't support WebP — you switch the format to JPG, and because the source has no transparency, it converts cleanly at your chosen quality.