Limit file format when using <input type="file">?

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I'd like to restrict the type of file that can be chosen from the native OS file chooser when the user clicks the Browse button in the <input type="file"> element in HTML. I have a feeling it's impossible, but I'd like to know if there is a solution. I'd like to keep solely to HTML and JavaScript; no Flash please.


Strictly speaking, the answer is no. A developer cannot prevent a user from uploading files of any type or extension.But still, the accept attribute of <input type = "file"> can help to provide a filter in the file select dialog box of the OS. For example,

<!-- (IE 10+, Edge (EdgeHTML), Edge (Chromium), Chrome, Firefox 42+) -->
<input type="file" accept=".xls,.xlsx" />

Limit file format when using <input type=“file”>?, Developers will not be able to prevent the user from choosing files of any type or extension in the native OS file select dialog box. But the accept� For Internet email account. such as Outlook.com or Gmail, the combined file size limit is 20 megabytes (MB) and for Exchange accounts (business email), the default combined file size limit is 10 MB. Newer versions Outlook 2010, 2007 Save your file to a cloud service and share a link


There is the accept attribute for the input tag. However, it is not reliable in any way. Browsers most likely treat it as a "suggestion", meaning the user will, depending on the file manager as well, have a pre-selection that only displays the desired types. They can still choose "all files" and upload any file they want.

For example:

<form>
    <input type="file" name="pic" id="pic" accept="image/gif, image/jpeg" />
</form>

[Solved] How to restrict input type="file" selection of "all files (*.*)" in , Below code allowing xlsx with "All Files(*.*)". How to restrict in Chrome Browser? Hide Copy Code. <input #myInput id="files� If you are running a server, some of your applications may require higher limits for opened file descriptors. A good example for such are MySQL/MariaDB services or Apache web server. You can increase the limit of opened files in Linux by editing the kernel directive fs.file-max. For that purpose, you can use the sysctl utility.


You can use the change event to monitor what the user selects and notify them at that point that the file is not acceptable. It does not limit the actual list of files displayed, but it is the closest you can do client-side, besides the poorly supported accept attribute.

var file = document.getElementById('someId');

file.onchange = function(e) {
  var ext = this.value.match(/\.([^\.]+)$/)[1];
  switch (ext) {
    case 'jpg':
    case 'bmp':
    case 'png':
    case 'tif':
      alert('Allowed');
      break;
    default:
      alert('Not allowed');
      this.value = '';
  }
};
<input type="file" id="someId" />

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Yes, you are right. It's impossible with HTML. User will be able to pick whatever file he/she wants.

You could write a piece of JavaScript code to avoid submitting a file based on its extension. But keep in mind that this by no means will prevent a malicious user to submit any file he/she really wants to.

Something like:

function beforeSubmit()
{
    var fname = document.getElementById("ifile").value;
    // check if fname has the desired extension
    if (fname hasDesiredExtension) {
        return true;
    } else {
        return false;
    }
}

HTML code:

<form method="post" onsubmit="return beforeSubmit();">
    <input type="file" id="ifile" name="ifile"/>
</form>

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Technically you can specify the accept attribute (alternative in html5) on the input element, but it's not properly supported.

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