Image Converter
Convert images between JPEG, PNG and WebP in your browser, with honest before/after size comparison and a format-choice guide. Nothing is uploaded.
Drop an image above to convert it
Three formats cover nearly every image on the web, and each makes a different trade. JPEG compresses photographs hard by discarding detail the eye barely notices, but it cannot store transparency. PNG keeps every pixel exact and supports transparent backgrounds, which keeps graphics crisp — at a much larger file size. WebP is the modern compromise: smaller than both for most images, with transparency support.
Converting an image means decoding its pixels and re-encoding them with a different codec — nothing more. The picture is redrawn by the new encoder, so a lossy-to-lossy conversion never recovers detail an earlier save threw away, and moving from PNG to JPEG discards information permanently. Conversion changes the container and usually the file size, not the inherent quality of the picture itself.
As a rule of thumb: photographs for the web go to JPEG or WebP, logos and screenshots that need sharp edges or transparency stay PNG, and WebP is the best default when the receiving platform accepts it. Everything here runs inside your browser — decoding, re-encoding and the download all happen on your device, so private images are never transmitted to a server.
Common uses
- Turning WebP images saved from the web into JPEG or PNG files that older desktop software, office suites and presentation tools can open without extra plugins or converters.
- Preparing photographs for a listing site or upload form that only accepts JPEG — convert once, check the honest size comparison, and download the accepted format.
- Flattening a transparent PNG logo onto a white background on purpose, because print services and email templates often mishandle alpha channels and expect a plain JPEG instead.
- Shrinking an oversized PNG screenshot by saving it as JPEG or WebP, where lossy encoding trades detail nobody will notice for a file that is far easier to share.
Frequently asked questions
- Which format should I convert my image to?
- Photographs: JPEG for maximum compatibility, WebP for smaller files. Graphics, screenshots and anything needing a transparent background: PNG. When a platform accepts WebP, prefer it — at equal visual quality it usually beats both JPEG and PNG on size.
- Does converting an image improve its quality?
- No. Conversion re-encodes the pixels you already have; it cannot recreate detail a lossy format discarded earlier. Saving a JPEG as PNG only wraps the same lossy pixels in a bigger lossless container. Expect the same picture at a different file size.
- Why is my converted file larger than the original?
- Re-encoding can produce more bytes than the source — most often when a small, highly optimized JPEG is saved as PNG, which stores every artifact-ridden pixel losslessly. The result card shows the real change. For a smaller file, pick a lossy target or lower the quality.
- What happens to transparency when converting to JPEG?
- JPEG has no alpha channel, so transparent pixels are composited onto a white background during conversion — the checkerboard becomes solid white. To keep transparency, convert to PNG or WebP instead; both preserve the alpha channel.
- Is my image uploaded to a server?
- No. Decoding, conversion and encoding all run inside your browser through the canvas API, and the result downloads straight to your device. Nothing is transmitted anywhere, which makes the tool safe for private or unreleased images.
- Why is the WebP target disabled in my browser?
- Encoding support is probed at runtime. Safari's canvas cannot encode WebP, so on that browser the WebP target is disabled with a note — silently exporting a mislabeled PNG would be worse than refusing.