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You should still validate on the server, but a client-side hint improves UX—users do not upload a file only to get an error.
Use the accept attribute with the MIME types you accept. image/* accepts all image types.
<input type="file" name="myImage" accept="image/*" />To allow only specific image types, list them:
<input type="file" name="myImage" accept="image/x-png,image/gif,image/jpeg" />You can check the browser support for this attribute here: https://caniuse.com/#feat=input-file-accept