In short: WeChat's sticker gallery wants a 240×240 canvas and a clean alpha channel around the character, not a white or checkerboard box. Most exports from drawing apps or screen recordings still carry that box. RemoveGifBG's WeChat preset (240×240) and a real alpha channel handle both automatically.
You've drawn or animated a character for a WeChat sticker set — maybe from a fan art GIF, a short clip, or original artwork — and the source file has a plain white or solid-color backdrop. WeChat's sticker gallery expects the character to float on nothing: no white square, no drop-shadow box, no leftover canvas color peeking through at the edges. Upload it as-is and it reads as a flat image tile, not a sticker.
RemoveGifBG has a WeChat Sticker preset (240×240) built into the output-dimensions dropdown, so the crop and canvas are already correct on export — no separate resize step. The removal pass writes a real per-pixel alpha channel rather than swapping the background for a preview color, and for animated stickers a temporal-consistency pass smooths frame-to-frame edge jitter so the outline doesn't shimmer at small size.
Drop in your GIF or video, pick the WeChat preset, and download a transparent PNG (for a static sticker) or GIF (for an animated one) sized to drop straight into WeChat's sticker submission form.
What WeChat's sticker gallery expects
See also: LINE sticker guide · Telegram sticker guide