WEBMANIFEST Data & Text — A .webmanifest file is a WEBMANIFEST Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.
Quick facts
What is .webmanifest
A .webmanifest file is a WEBMANIFEST Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.
In the mime-db registry it maps to application/manifest+json with UTF-8 encoding, and it is marked as compressible. When serving .webmanifest over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to application/manifest+json and is used by JSON among others — and is delivered over HTTP via the Content-Type header.
How to open .webmanifest files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: application/manifest+json; charset=utf-8
Common software that reads/writes .webmanifest:
Relation chain
Related extensions
Related MIME types
Related programming languages
Common uses
How to edit .webmanifest files
How to create .webmanifest files
Frequently asked questions
Common options include VS Code, Notepad++, Sublime Text. 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 .webmanifest extension.
application/manifest+json is the media type identifier used for .webmanifest files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-09-13
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