Go into your settings on your phone and increase the display to the lightest setting.

Find a white background on safari or google.

Place the negative on the white background on the phone.

Take a picture of the negative using another phone or digital camera.

Send the picture to your computer via email or other methods.

Upload the image to any image editing software. Fotor is free. I use Lightroom and Picmonkey is another good option.

Look for a tool called Tone Curves or Curves.

If you have the option called Invert just choose that and your negative will turn positive. If not, then drag the lower-left point of the line all the way to the top, followed by dragging the upper right point, dragged to the bottom right. 

Play around with the other tools such as color adjustments to warm up the color and get the best possible image.

Save your creation, print it, or share with others,