Log File — Plain-text log of application or system events.
Quick facts
What is .log
A .log file is a Log File — Plain-text log of application or system events.
In the mime-db registry it maps to text/plain, and it is marked as compressible. When serving .log over HTTP, set the Content-Type header as shown in Developer info below.
Related entities: it maps to text/plain — and is delivered over HTTP via the Content-Type header.
How to open .log files
Developer info
When served over HTTP, responses should set the following header:
Content-Type: text/plain
Common software that reads/writes .log:
Relation chain
Related extensions
Related MIME types
Common uses
How to edit .log files
How to create .log files
Frequently asked questions
Common options include VS Code, tail. 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 .log extension.
text/plain is the media type identifier used for .log files during network transfer (for example in the HTTP Content-Type header).
Sources & standards
Updated 2026-08-18
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