Change an image's format in one step, then compare the new file size with the original before you download it.
Runs in your browser — nothing is uploaded
Each format trades quality, transparency and size differently. PNG keeps every pixel and supports transparency, which suits logos and screenshots. JPEG stores photographs far smaller but has no transparency and loses detail at low quality. WebP usually beats both on the web, with smaller files and optional transparency.
The converter redraws the image on a canvas and encodes it again in your browser. When you choose JPEG, transparent areas become white, because JPEG cannot store transparency. The result shows the original and new sizes side by side, so you can judge whether the change is worth it.
Converting between lossy formats repeats compression. For the best result, start from the original file rather than from a copy that was already compressed.
Use PNG for logos, icons and screenshots that need sharp edges or transparency. Use JPEG for photographs when you need the widest compatibility. Use WebP when the destination accepts it, because it usually gives the smallest file at a similar visual quality.
Yes, JPEG is lossy. The quality slider controls how much detail is discarded. Values from 80 to 90 look close to the original for most photos, while lower values show blocking around edges. Converting a PNG to JPEG also removes transparency, so the background becomes white.
JPEG has no alpha channel, so transparent pixels must be filled with a solid colour. This converter fills them with white. If you need another background, place the image on that colour in an editor first, then export it as JPEG.
Chrome, Edge and Firefox export WebP from a canvas. Some older Safari versions cannot. In that case the converter tells you WebP is unavailable and asks you to choose PNG or JPEG, instead of quietly saving a PNG with a .webp name.
No. The image is redrawn and encoded again, so EXIF, GPS and other embedded metadata are removed. This is useful when you want to share a photo without location details. Colour profiles are also simplified to standard sRGB.
There is no fixed file size limit, but very large images use a lot of memory. Each side is limited to 8000 pixels and the total area to about 16 million pixels, which is the Safari canvas limit. If a conversion fails, resize the photo first and try again.