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V16 CMS: Tell the developer to set MaxRequestLength regardless of hosting platform #7309

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Aug 14, 2025
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V16 CMS: Tell the developer to set MaxRequestLength regardless of hosting platform #7309

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docs: adds a hint box and information to advise developers to set Max…
iOvergaard Aug 14, 2025
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docs: formatting
iOvergaard Aug 14, 2025
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4 changes: 4 additions & 0 deletions 16/umbraco-cms/reference/configuration/maximumuploadsizesettings.md
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Expand Up @@ -12,6 +12,10 @@ Learn how to change the upload size limit for your Umbraco site depending on you

By default, Umbraco does not restrict upload size. The limits are controlled by the hosting platform.

{% hint style="info" %}
It is advisable that you tell Umbraco what the maximum upload size is by setting the `Umbraco:CMS:Runtime:MaxRequestLength` in the `appsettings.json` file. The Backoffice will use this value to help guide the users.
{% endhint %}

## Using IIS

The default upload limit in IIS is 30000000 bytes (~28.6 MB). The maximum value allowed is 4 GB.
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2 changes: 1 addition & 1 deletion 16/umbraco-cms/reference/configuration/runtimesettings.md
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Expand Up @@ -24,7 +24,7 @@ An example of a configuration could look something like:
}
```

- `MaxRequestLength` is specified in kilobytes. Setting this limits the request size, including the size of uploaded files. This only has an effect when hosting with Kestrel. See the [Maximum Upload Size Settings
- `MaxRequestLength` is specified in kilobytes. Setting this limits the request size, including the size of uploaded files. This only has an effect on the server when hosting with Kestrel, but is also used by the Backoffice to advise users. See the [Maximum Upload Size Settings
](./maximumuploadsizesettings.md) article for more information.
- `Mode` can have three values: `BackofficeDevelopment` (default), `Development`, and `Production`. For more information, see the [Runtime modes](../../fundamentals/setup/server-setup/runtime-modes.md) article.
- `TemporaryFileLifeTime` is specified as a timespan. The default value is one day - `1.00:00:00`.