Why removing a watermark from a GIF is harder than from a photo
A photo is one image; a GIF is a timeline. A free GIF watermark remover has to answer three questions a still-image tool never faces: how to decode the frames, how to keep the repair consistent across them, and how to re-encode the result without wrecking the colours.
Decoding: frames are not independent images
Many animated GIFs store only the pixels that changed since the previous frame, plus a disposal instruction saying what to do with that region afterwards. To repair frame 12 correctly you have to reconstruct what frame 12 actually looks like, which means replaying the disposal chain from frame 0. This tool does that with a streaming compositor holding at most four canvases at once, so a 60-frame GIF doesn't balloon into 60 full-size bitmaps.
Repairing: one mask, many frames
Painting a separate selection on every frame would be tedious, so you mark the area once on the first frame and that mask is reused. This is why the tool works best on overlays that stay in one place — a corner logo, a date stamp, a caption bar. An overlay that slides across the frame is outside what a single mask can describe.
Running the model on all frames would also be wasteful. Before repairing a frame, the marked region is compared against the same region in the previous frame. If they are effectively identical, the earlier result is reused and the model is skipped. On a screen recording with a static watermark, a large share of frames never touch the model at all.
Re-encoding: why one palette matters
GIF can only hold 256 colours. Quantize each frame independently and the same colour lands on a different palette index from frame to frame, which reads as colour flicker during playback. Instead, up to eight frames are sampled across the animation, one palette is built from that montage, and every frame is mapped against it. Transparency gets a reserved slot in that palette rather than stealing a slot from a real colour.
That pipeline is what separates an online GIF watermark remover from a photo editor that happens to import GIF files: the animation is treated as a sequence of dependent frames, not as one image to be cleaned and flattened on export.
