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" />

<input type="file">, input elements with type="file" let the user choose one or more files to avoid using them when possible, since doing so will limit the ability of� 100 GB. The maximum size for files attached to list items is 250 MB. To learn more about restrictions and limits when using the new OneDrive sync app (OneDrive.exe), see Invalid file names and file types. Moving and copying across sites. Copying/Moving multiple files in a single operation has three requirements: No more than 100 GB total file size

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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Comments
  • Its easily possible with PHP, but I don't know if you can use that so I won't post the code.
  • I can, but I have a solution working with JavaScript - it removes the annoyance of uploading a file then getting the "Wrong file!" error.
  • Also see more recent question: stackoverflow.com/questions/181214/…
  • One thing to note is that while it is not great for validation, accept will limit the visible files to the accepted ones while the user is browsing them (at least in some browsers ...). So this is more a UI ergonomy feature than a validation one.
  • @Sandesire I don't think that you can restrict file sizes in HTML. It's possible using JavaScript, as you suggested.
  • From my personal experience this looks like a good answer, the mime type alone will not work on all browsers.
  • Incidentally accept still doesn't work in Edge: stackoverflow.com/questions/31875617/…. More details here: wpdev.uservoice.com/forums/257854-microsoft-edge-developer/…
  • I wish we had a choice to exclude files as well, for example exclude="exe". ¯_(ツ)_/¯
  • To clarify Edge behavior further (according to my tests), it will add different filters based on what you specify, but a) it's not bundled, so it will list each extension as a separate option and b) it will always add some in-build extensions such as .html, and c) as already stated, it will always pre-select (*). Which makes it a big mess and useless in most cases. I voted on the uservoice link, let's hope they listen sooner or later.
  • for additional information see stackoverflow.com/questions/181214/…
  • Although it is true that's it's impossible to prevent the user from selecting ANY type of file eventually, these days you can take advantage of the HTML5 File API and work with the selected file for upload, before it is actually uploaded to the server, including detecting its type, size and more. Give it a try. It's very easy to use, yet very powerful and useful.