How do I set the Content-Type for .gif in Nginx?

Make sure image/gif gif; is listed in the types block (usually in /etc/nginx/mime.types) and reload Nginx.

Should I gzip .gif files?

No — the format is already compressed, so HTTP compression gives no benefit.

.gif MIME Type — image/gif

image/gif

MIME type for .gif

Images

What is the MIME type of .gif files?

The MIME type (media type) for GIF image files with the .gif extension is image/gif. Supports animation with up to 256 colors. For animations, MP4 or animated WebP are usually 5–10× smaller.

Content-Type header

Content-Type: image/gif

Server configuration

Server	Configuration
Nginx (`mime.types` or `types {}`)	`image/gif gif;`
Apache (`.htaccess`)	`AddType image/gif .gif`
IIS (`web.config`)	`<mimeMap fileExtension=".gif" mimeType="image/gif" />`
Node.js / Express	`res.type('gif')` or `res.setHeader('Content-Type', 'image/gif')`
Amazon S3	Set `Content-Type: image/gif` on the object (metadata), or pass `--content-type image/gif` to `aws s3 cp`

Should .gif files be compressed?

No. GIF image files are already compressed internally, so gzip or Brotli would waste CPU and barely reduce — sometimes even increase — the size. Leave image/gif out of your compression configuration.

Why the MIME type matters

Browsers decide what to do with a response — render, run, play or download — from the Content-Type header, not the file extension. With X-Content-Type-Options: nosniff, a wrong type causes stylesheets and scripts to be blocked outright. For uploads, never trust the type sent by the client; check the file’s content (its magic bytes) on the server.

.gif MIME Type: image/gif