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In this post, I will share how to only accept images or specific extensions using HTML. Using this method will help to add extra checking before uploading images to your server. We will use the accept="" attribute with the specified extensions that you want to allow to upload.
Here is an example of how to do it.
<input type="file" name="file" class="form-control" accept=".jpg,.jpeg,.bmp,.png,.gif">
As you can see I added .jpg, .jpeg, .bmp, .png, .gif as value with accept attribute. Now using this you only show images with have this extension on a dialog box.
I hope it helps. Cheers :)