Image Format Converter

Drop in an image and choose an output format. The file is decoded and re-encoded by your browser's own graphics engine, so the conversion happens on your machine rather than on a server somewhere.

You can resize at the same time — 75%, 50% or 25% of the original dimensions — and for the lossy formats you get a quality slider. The panel shows the original size next to the converted size so you can see the trade before downloading.

It reads anything your browser can display, which in practice means PNG, JPG, WebP, GIF, BMP, and usually AVIF. Output is PNG, JPG or WebP.

JPG for photographs. It is lossy, has no transparency, and produces the smallest files for images with lots of colour gradation. Quality 80–90% is the usual sweet spot; below about 70% the artefacts start to show.

PNG for anything with sharp edges or transparency — logos, screenshots, diagrams, UI mockups. It is lossless, so no quality is ever discarded, but files are considerably larger than JPG for photos.

WebP for the web. It is usually 25–35% smaller than JPG at comparable quality and supports transparency, which makes it the best default for a website in 2026. Every current browser supports it.

One thing to know: converting a JPG to PNG will not restore quality that JPG already discarded, and it will usually make the file bigger. Convert to PNG for transparency or editing, not to improve a photo.

JPG has no alpha channel, so transparent areas have to become something. This tool fills them with white before encoding, which is what you almost always want — the alternative, which some converters do, is to leave them black.

If you need to keep transparency, choose PNG or WebP instead. Both support it, and WebP will usually give you a much smaller file than PNG for the same image.

No. The whole conversion runs through the Canvas API inside your browser. There is no server, no API call, no queue and no account — the image data never leaves the tab.

That is worth caring about for anything sensitive: screenshots containing customer data, unreleased design work, documents with personal details. Most free online converters post your file to their backend, and what happens to it afterwards is their policy, not yours.

It also means the tool keeps working with no network connection once the page has loaded.