.otf MIME Type — font/otf

Q: How do I set the Content-Type for .otf in Nginx?

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

font/otf

MIME type for .otf

Fonts

What is the MIME type of .otf files?

The MIME type (media type) for OpenType font files with the .otf extension is font/otf. Desktop font format; convert to WOFF2 for the web.

Content-Type header

Content-Type: font/otf

Server configuration

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

Should .otf files be compressed?

Yes. OpenType font is uncompressed data, so enabling gzip or Brotli for font/otf typically saves 50–80 % of the transfer size. Make sure your server’s compression list includes this type — check with the website compression test.

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.

Frequently asked questions

What is the MIME type for .otf?

font/otf.

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

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

Should I gzip .otf files?

Yes — the format compresses well, so add the type to your gzip/Brotli configuration.

.otf MIME Type: font/otf