GifSlim

Processed on your device · no media uploads

GIF optimizer for a smaller attachment

The animation is ready, but the attachment is too big. GifSlim helps you optimize GIF files without sending them to a server. Start with the GIF compressor below, inspect the original and result sizes, and decide whether the change is worth keeping.

Drop one GIF here

One GIF · up to 20 MiB · processed locally

Starts at 64 colors. Fewer colors can change shading. If the file is not smaller, GifSlim tries fewer colors; if none help, it returns the original with a notice. The result is never larger.

Choose a GIF to see its starting size.

Animation preview

Start with a GIF or a video

GIF compressor: find the color setting that pays off

Compress GIF files locally with GifSlim. Adjust the color palette, inspect both animations and compare the actual file sizes before downloading.

Open tool

Convert to GIF with only the frames you need

Convert video to GIF on your device. Set the segment, frame rate and output size in GifSlim, then check the animation before saving your GIF.

Open tool

A quick size check

  1. 01

    Start with the file you have

    Choose an existing GIF in the panel below. If your source is a video, open the video converter instead and select only the moment you need.

  2. 02

    Make one adjustment

    For an existing GIF, start with the default 64 colors. For a video, begin with a short segment and a modest frame rate. Check the preview before adjusting the settings again.

  3. 03

    Check the actual difference

    Read both file sizes, watch the result, and download it if it fits your purpose. Keep your source so you can try another setting without building on previous quality loss.

Pick the constraint before changing the picture

A GIF for a small reply, a website walkthrough, and an email attachment each has a different job. First find out whether the destination is rejecting the file size, the pixel dimensions, or the format. Common upload limits vary between services, account types, and uses such as avatars or attachments. Check the receiving screen rather than assuming that a file accepted somewhere else will also work here.

Three things that make an animation heavy

Colors describe the shades available to each frame. Reducing them can help with a cartoon or a flat interface, while a photograph may show rough gradients. Dimensions determine how many pixels each frame needs. Frames determine how many pictures must be stored across the animation. Lowering all three at once may save bytes, but makes it hard to see which change damaged the result.

The compressor on this page changes the palette. It does not expose resizing or frame removal controls. If the source is a video, choose a smaller output and a shorter interval on the video converter before creating the GIF. Starting small usually gives you more room to keep useful color detail.

Use the size comparison as a decision

Compression is an experiment, not a fixed percentage discount. Texture, camera movement, and colors that change across the frame influence the outcome. The compressor reduces redundant frame data and uses a shared palette when suitable. If your chosen color count cannot save bytes, it automatically tests fewer colors. If those attempts do not help, it returns the original unchanged and shows a notice, so the result is never larger than the source GIF. Check the preview: fewer colors may still affect important details. GifSlim keeps the workflow focused on this decision: do the saved bytes justify what changed on screen?

Questions before you save

Which tool should I use for an existing animation?

Use the compressor when your file is already a GIF. The video converter is for a clip that still needs to become an animation. Both work locally; neither needs an account.

Will a smaller file still be readable in a chat?

Check the animation at the size people will see it. Facial expressions can survive fewer colors better than small text or a shaded chart. Prefer readability over a tiny saving in bytes.

Why is a GIF larger than the video it came from?

Video formats can describe changes between frames efficiently. A GIF uses indexed colors and can become bulky when it contains many detailed frames. A short duration matters as much as resolution.

Do I need to send my file anywhere?

No. Selection, processing, and previews happen on your device. The site still loads page and processing resources over the network, but it does not upload your media for conversion.