Questions about GIF and WebP
What happens to my animation?
It is dropped — you get the first frame as a still picture. Converting an animation properly means re-encoding every frame with its timing intact, which this page does not do yet. For a static GIF, which is most of them, this is exactly what you want.
Why is a simple GIF so large?
Because it stores 256 colours in a palette and dithers everything else, then compresses with an algorithm designed when a hard drive held twenty megabytes. A photograph saved as GIF is both bigger and worse-looking than the same photograph as WebP.
What should I use for animation instead?
For short loops, an MP4 or WebM video file — usually a tenth of the size of the equivalent GIF and smoother. For interface animation, CSS. GIF is worth keeping only where something else demands it.
Are my images really not uploaded?
Correct. The conversion uses your browser's own image engine, so the file is read from your disk into the tab and never sent over the network. Open your browser's network panel and convert something — no request is made.
How does the target size work?
The converter encodes your image, checks the result against your target, and adjusts quality until it fits. If quality alone cannot get there, it reduces the dimensions in steps rather than destroying the picture. You always see what happened.
Is there a limit on how many files I can convert?
None from us — your computer does the work, not our server. The practical ceiling is around 40 megapixels per image, where browsers stop being reliable.