Rollpie Retro is a free retro photo filter that runs in your browser with no install. Load an image by drag and drop or tap, and apply ten looks: VHS, Showa retro, 8mm film, Polaroid, disposable camera, old photo, CRT monitor, Game Boy, and security camera.
Once an image is loaded, choose a mode and fine-tune each parameter with the − / + steppers. Hold the compare button to check against the original, reset to return to the defaults, and save the finished image as a PNG.