Convert images to PNG, JPG or WebP — private, in-browser

Switching an image from one format to another usually means trusting a website with your photo. This converter works differently: your picture is decoded and re-encoded entirely inside your browser using the Canvas API, so it never leaves your device.

Drop in any common raster image, pick PNG, JPEG or WebP, and download the converted file in a click. JPEG lets you balance quality against file size, and transparent images are placed on a clean white background when you choose JPEG.

How it works

When you add a picture, the browser first decodes it into raw pixels and draws them onto an off-screen HTML canvas element. From there, the canvas "toBlob" method re-encodes those pixels into the format you picked, and that blob is handed straight to a download. Every step runs on your own machine in JavaScript, which is why nothing is ever sent to a server.

Because the image is fully rasterized during decoding, the converter is format-agnostic on the way in: anything your browser can display, including PNG, JPEG, WebP, GIF and BMP, becomes a normal canvas you can re-export. The trade-off is that the output is always a single still frame, so an animated GIF will convert to a static image of its first frame.

When to use it

Reach for PNG when you need lossless quality or transparency, such as logos, screenshots with crisp text, or graphics you will edit again later. PNG keeps every pixel exact but tends to produce larger files for photographs.

Choose JPEG for photos and complex images where a smaller file matters more than perfect fidelity, for example email attachments or pages that need to load quickly. WebP is the middle ground: it supports both transparency and strong lossy compression, so it is a good pick for modern websites where you want small files without giving up an alpha channel. A common workflow is taking a heavy PNG export from a design tool and re-saving it as WebP or JPEG to cut the size before publishing.

Tips

If you are converting a transparent PNG to JPEG, remember the transparent areas are flattened onto a solid white background, since JPEG has no alpha channel. Convert to WebP instead when you need the transparency preserved.

With the JPEG quality slider, nudge it down gradually and watch the file size: large reductions are often invisible at first, while the last few steps toward maximum quality add a lot of bytes for little visible gain. Re-encoding a lossy image repeatedly compounds compression artifacts, so when you can, convert from an original or lossless source rather than from an already-compressed JPEG. And because everything happens locally, you can safely convert sensitive or private images, even while offline once the page has loaded.

How to use Convert Image

1. Add an image by dropping it onto the box above or clicking to browse.
2. Choose the output format you want: PNG, JPEG or WebP.
3. For JPEG, drag the quality slider to balance size and detail.
4. Click “Convert image” to process it locally in your browser.
5. Download the converted file. Nothing was ever uploaded.

Frequently asked questions

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