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When uploading a file via the Visualforce apex:inputFile standard component, if the file size exceeds the 3Mb limit I would like to display a message to the user that the file is greater than 3Mb and cannot be uploaded into the system.
Please advise how this can be achieved on VisualForce level?

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Just bind fileSize to an attribute:

public Integer fileSize { get; set; }
// ...
if(fileSize > 3000000) {
  // Show error
  return;
}

<apex:inputFile filesize="{!fileSize}" ... />
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  • Shouldn't it be 3 * 1024 * 1024? so if(fileSize > 3145728)
    – caleb.breckon
    Mar 13, 2018 at 17:06
  • @caleb.breckon I personally prefer the classic definition of kilo/mega/giga (base-2 notation), but Salesforce tends to use the IEC standard definitions (notice we have a 6000000 byte heap limit, not 6291456 bytes). It's really a matter of who's asking.
    – sfdcfox
    Mar 13, 2018 at 18:18
  • @sfdcfox do we have any limitation for this. I have exactly used this but I am gettng filesize null in submit function called through action function on apex side. The function has return type of pageReference. I am really stuck there !
    – Pankaj Andhale
    Aug 25, 2020 at 14:11
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    @PankajAndhale It depends on the situation. apex:inputFile does not support rerendering, so you need to be aware of the limitations. You may want to ask a specific question with your code so we can take a look.
    – sfdcfox
    Aug 25, 2020 at 14:35
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    @PankajAndhale Maybe a bug? I know there is a maximum payload size, it may be that Visualforce is not even attempting the file since it exceeds some limit.
    – sfdcfox
    Aug 25, 2020 at 16:13

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