Image Format Convert

How to use it

1. Select one or more images - the file picker accepts multi-select.
2. Pick the target format: PNG, JPEG or WebP.
3. For JPEG or WebP, set the quality slider; PNG ignores it because PNG is lossless.
4. Click Convert all - every converted file appears in the list with its new size.
5. Click Download next to each file to save it.

Common use cases

• Preparing web assets - turn screenshots into WebP so pages load faster.
• Unifying a mixed folder - bring PNG, HEIC exports and JPEG files into one format.
• Removing transparency - convert to JPEG when a platform rejects transparent PNGs.

Why it stays private

Each image is decoded onto a canvas and re-encoded inside your browser. Nothing is uploaded, so the batch you convert never leaves your device.

FAQ

Q: Why is my converted JPEG showing white where the image was transparent? A: JPEG has no transparency channel, so transparent areas are filled with white before encoding. Use PNG or WebP to keep transparency.

Q: Why did the PNG come out larger than the original JPEG? A: PNG stores pixels losslessly, so a photo re-encoded as PNG is usually larger than its lossy JPEG original. PNG suits graphics with flat colors; photos shrink as JPEG or WebP.

Q: Is there a limit on how many images I can convert at once? A: No fixed limit - conversion runs one file at a time in your browser, so very large batches depend on your device memory. For hundreds of photos, work in smaller groups.