Why Can't I Set a File Input's Value to a Local File Path?

Can't Set File Input Value to Client-Side Disk Path

When trying to set the value of a file input field in HTML, it's essential to understand the security restrictions that prevent assigning it to a client-side disk file system path.

Consider the following example:

<form name="foo" method="post" enctype="multipart/form-data">
    <input type="file" value="c:/passwords.txt">
</form>
<script>document.foo.submit();</script>

Security concerns arise if websites were given the ability to access sensitive files on a user's computer. This vulnerability would allow websites to obtain confidential information such as passwords, compromising user privacy.

Therefore, setting the file input value to a client-side disk file system path is not possible. However, setting it to a publicly accessible web resource, as demonstrated in another answer, is technically feasible. However, this approach still does not provide access to the client's local file system.

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