GIF is a bad video codec
A GIF animation is a stack of paletted frames. There is no modern motion compensation. That is why a grainy 800-pixel loop can be 15 MB. Compressing GIF can help: fewer colors, more aggressive palette, maybe fewer distinct frames depending on the encoder. It will not turn a cinematic clip into 200 KB without looking like 1998. If you control the page, the real fix is MP4 or WebM (or animated WebP) with a still poster. Use Compress GIF when the destination literally requires GIF: many email systems, some forums, sticker fields, and “no video” CMS modules.
Stills: a single-frame GIF of a photo is also a bad idea. Compressing it may help a little; converting to JPEG or PNG helps more. This tool is most justified on actual loops.
What you can safely throw away
Color: 256 is the ceiling; many GIFs look fine at 64 or 128 colors, especially cartoons and UI. Photos in GIF already look poor; fewer colors make them posterized. Dither hides banding and adds noise that can grow the file—there is a tension. Resolution: a 1080p GIF is almost always wrong; 480-pixel-wide loops are the cultural default for a reason. Resize first if you can, then compress.
Transparency: 1-bit. Compression should not invent soft alpha. Watch for a new matte color around edges.
If the compressor flattens animation to a still, stop and keep the original—you needed a tool that rewrites the frame list. ToolPin aims to optimize GIFs, but extremely large or oddly constructed files (huge canvas, disposal tricks) can be too much for a browser.
Privacy, limits, and honesty
GIFs from group chats can be sensitive or just embarrassing. Processing is local; they are not uploaded to toolpin.online. 250 MB limit. A 200 MB GIF will likely freeze a phone tab—that file should have been a video anyway. No signup, no watermark.
Metadata on GIF is uncommon. Still, re-encode typically produces a clean file without comment blocks.
When to quit GIF
If the compressed GIF is still several megabytes, convert the motion to video and keep a tiny GIF only if you must. If the GIF is a still screenshot, use PNG. If it is a still photo, use JPEG. If it is a logo, use PNG or SVG. Compress GIF is for the leftover cases where the loop must remain a GIF. That is a smaller set than the internet’s GIF habit suggests.