Image Format Converter

PNG, JPEG, and WebP make different trade-offs for the same pixels. PNG is lossless and supports transparency, which makes it the right default for screenshots and graphics with sharp edges — but it rarely compresses photos well. JPEG is lossy and has no transparency, but it's small and universally supported, which is why it's the default for photos almost everywhere. WebP is also lossy (with an optional lossless mode this tool doesn't expose) and, for most photos, produces a noticeably smaller file than JPEG at similar visual quality, at the cost of slightly less universal support in older software.

Rather than guessing which format will end up smallest for your specific image, this tool converts the same image into all three at once and shows you the result side by side — the smallest is marked so you can decide with real numbers instead of a rule of thumb. Everything runs locally in your browser; nothing you upload is sent anywhere.

• •Trust the actual numbers here over a general rule — which format comes out smallest depends on the specific image (a screenshot with flat colors can compress better as PNG than as JPEG, even though photos usually go the other way).
• •If the image needs transparency, only PNG and WebP are real options — JPEG will fill transparent areas with white, which shows up as a visible background if the image is later placed on anything but a white background.
• •WebP support is now near-universal in browsers, but check compatibility if the image needs to work in older software, some email clients, or design tools outside the browser.
• •The quality slider only affects JPEG and WebP — PNG output is always the same lossless re-encode regardless of the slider, since PNG doesn't have a quality concept.