GIF only supports one fully transparent color per frame, with nothing in between, so any anti-aliased edge around a transparent shape was already baked into the file as solid, opaque pixels. WebP's alpha channel can hold smooth partial transparency, but converting a GIF frame won't add that smoothness retroactively, since the source pixels never had it to begin with.
A jagged edge or color fringe isn't something conversion can fix
If a converted logo or icon shows a hard, slightly jagged edge or a thin colored halo around the transparent boundary, that came from the original GIF, not from the WebP conversion. Fixing it means going back to a source file with real anti-aliased transparency, usually a PNG or a vector original, rather than adjusting anything in this tool.
Lossy or lossless, and when each one matters
Unlike GIF, WebP supports both lossy and lossless compression in the same format. Icons, screenshots and flat graphics do best with lossless settings, matching PNG's exact fidelity while trimming the file size. Photographic frames benefit more from lossy compression closer to how JPEG works, just smaller for the same visual quality. This tool tunes its settings to the kind of frame it's converting, so there's nothing to configure manually.
WebP has been safe to rely on for a while now
Older guides sometimes warn about WebP support gaps in older Safari versions, but that's no longer a real concern in 2026. Every major browser renders WebP natively, which makes it a reasonable default for a converted GIF still without needing to keep a JPEG or PNG fallback around for most everyday projects.