Convert input[type=file] to Base64 before submitting to HomeController

Question

How can I convert 5 separate inputs shown below:

<form action="uploadImages" method="post" id="frm">
     <input name="Img1" type="file" accept="image/*;capture=camera">
     <input name="Img2" type="file" accept="image/*;capture=camera">
     <input name="Img3" type="file" accept="image/*;capture=camera">
     <input name="Img4" type="file" accept="image/*;capture=camera">
     <input name="Img5" type="file" accept="image/*;capture=camera">
      <input type="submit" value="Submit Form" class="UserSubmit" />
</form>

To Base64 string before it gets sent to the HomeController.

the file types will only be images. (png/jpg).