SID Image — A .sid file is a SID Image. It is a raster or vector image format used for photos, web assets and design work.
Quick facts
What is .sid
A .sid file is a SID Image. It is a raster or vector image format used for photos, web assets and design work.
In the mime-db registry it maps to image/x-mrsid-image. When serving .sid over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to image/x-mrsid-image — and is delivered over HTTP via the Content-Type header.
How to open .sid files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: image/x-mrsid-image
Common software that reads/writes .sid:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .sid files
How to create .sid files
Frequently asked questions
Common options include Photoshop, GIMP, Paint. You can also open many of these files with built-in viewers or a browser.
Create a new file in any text editor or the app that owns the format and save it with the .sid extension.
image/x-mrsid-image is the media type identifier used for .sid files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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