How to increase the max upload file size in ASP.NET?

I have a form that excepts a file upload in ASP.NET. I need to increase the max upload size to above the 4 MB default.

I have found in certain places referencing the below code at msdn.

[ConfigurationPropertyAttribute("maxRequestLength", DefaultValue = )]

None of the references actually describe how to use it, and I have tried several things with no success. I only want to modify this attribute for certain pages that are asking for file upload.

Is this the correct route to take? And how do I use this?


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

This setting goes in your web.config file. It affects the entire application, though… I don’t think you can set it per page.

    <httpRuntime maxRequestLength="xxx" />

“xxx” is in KB. The default is 4096 (= 4 MB).

Method 2

For IIS 7+, as well as adding the httpRuntime maxRequestLength setting you also need to add:

        <requestLimits maxAllowedContentLength="52428800" /> <!--50MB-->

Or in IIS (7):

  • Select the website you want enable to accept large file uploads.
  • In the main window double click ‘Request filtering’
  • Select “Edit Feature Settings”
  • Modify the “Maximum allowed content length (bytes)”

Method 3

To increase uploading file’s size limit we have two ways

IIS6 or lower

By default, in ASP.Net the maximum size of a file to be uploaded to the server is
around 4MB. This value can be increased by modifying the
maxRequestLength attribute in web.config.

Remember : maxRequestLenght is in KB

Example: if you want to restrict uploads to 15MB, set maxRequestLength to “15360” (15 x 1024).

   <!-- maxRequestLength for, in KB --> 
   <httpRuntime maxRequestLength="15360" ></httpRuntime> 

IIS7 or higher

A slight different way used here to upload files.IIS7 has
introduced request filtering module.Which executed before
ASP.Net.Means the way pipeline works is that the IIS
value(maxAllowedContentLength) checked first then ASP.NET
value(maxRequestLength) is checked.The maxAllowedContentLength
attribute defaults to 28.61 MB.This value can be increased by
modifying both attribute in same web.config.

Remember : maxAllowedContentLength is in bytes

Example : if you want to restrict uploads to 15MB, set maxRequestLength to “15360” and maxAllowedContentLength to “15728640” (15 x 1024 x 1024).

   <!-- maxRequestLength for, in KB --> 
   <httpRuntime maxRequestLength="15360" ></httpRuntime> 

         <!-- maxAllowedContentLength, for IIS, in bytes --> 
         <requestLimits maxAllowedContentLength="15728640" ></requestLimits>

MSDN Reference link :

Method 4

I believe this line in the Web.config will set the max upload size:


        <httpRuntime maxRequestLength="600000"/>

Method 5

for a 2 GB max limit, on your application web.config:

  <compilation debug="true" targetFramework="4.5" />
  <httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647" />

      <requestLimits maxAllowedContentLength="2147483647" />

Method 6

If its windows 2003 / IIS 6.0 then check out AspMaxRequestEntityAllowed = “204800” in the file metabase.xml located in folder C:windowssystem32inetsrv

The default value of “204800” (~205Kb) is in my opinion too low for most users. Just change the value to what you think should be max.

If you cant save the file after editing it you have to either stop the ISS-server or enable the server to allow editing of the file:

How to increase the max upload file size in ASP.NET?

Edit: I did not read the question correct (how to set the maxrequest in webconfig). But this informatin may be of interrest for other people, many people who move their sites from win2000-server to win2003 and had a working upload-function and suddenly got the Request.BinaryRead Failed error will have use of it. So I leave the answer here.

Method 7

I’ve the same problem in a win 2008 IIS server, I’ve solved the problem adding this configuration in the web.config:

    <httpRuntime executionTimeout="3600" maxRequestLength="102400" 
     appRequestQueueLimit="100" requestValidationMode="2.0"

The requestLengthDiskThreshold by default is 80000 bytes so it’s too small for my application. requestLengthDiskThreshold is measured in bytes and maxRequestLength is expressed in Kbytes.

The problem is present if the application is using a System.Web.UI.HtmlControls.HtmlInputFile server component. Increasing the requestLengthDiskThreshold is necessary to solve it.

Method 8

Max file size can be restricted to a single MVC Controller or even to an Action.
web.config <location> tag can be used for this:

<location path="YourAreaName/YourControllerName>/YourActionName>">
    <!-- 15MB maxRequestLength for, in KB 15360 -->
    <httpRuntime maxRequestLength="15360" />
        <!-- 15MB maxAllowedContentLength, for IIS, in bytes 15728640 -->
        <requestLimits maxAllowedContentLength="15728640" />

Or you can add these entries in area’s own web.config.

Method 9

I know it is an old question.

So this is what you have to do:

In you web.config file, add this in <system.web>:

<!-- 3GB Files / in kilobyte (3072*1024) -->
<httpRuntime targetFramework="4.5" maxRequestLength="3145728"/>

and this under <system.webServer>:


      <!-- 3GB Files / in byte (3072*1024*1024) -->
      <requestLimits maxAllowedContentLength="3221225472" />


You see in the comment how this works. In one you need to have the sie in bytes and in the other one in kilobytes. Hope that helps.

Method 10

If you are using Framework 4.6

<httpRuntime targetFramework="4.6.1" requestValidationMode="2.0" maxRequestLength="10485760"  />

Method 11

You can write that block of code in your application web.config file.

<httpRuntime maxRequestLength="2048576000" />
<sessionState timeout="3600"  />

By writing that code you can upload a larger file than now

Method 12

If you use sharepoint you should configure max size with Administrative Tools too:

Method 13

I have a blog post on how to increase the file size for asp upload control.

From the post:

By default, the FileUpload control allows a maximum of 4MB file to be uploaded and the execution
timeout is 110 seconds. These properties can be changed from within the web.config file’s httpRuntime section. The maxRequestLength property determines the maximum file size that can be uploaded. The
executionTimeout property determines the maximum time for execution.

Method 14

If it works in your local machine and does not work after deployment in IIS (i used Windows Server 2008 R2) i have a solution.

Open IIS (inetmgr)
Go to your website
At right hand side go to Content (Request Filtering)
Go to Edit Feature Settings
Change maximum content size as (Bytes you required)
This will work.
You can also take help from following thread

Method 15

If you use ssl cert your ssl pipeline F5 settings configure.Important.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

0 0 votes
Article Rating
Notify of

Inline Feedbacks
View all comments
Would love your thoughts, please comment.x