How can I improve the quality of my design file?

If you want to improve the quality of a JPG/PNG format file, you have the following three options:

1. Try vectorizing the file. Once it's vectorized, you can save it again as a high-resolution raster file without losing any pixels.
2. Reduce the image size. This will increase the resolution, but a visually shrunk design may not be what you want.
3. Recreate the design at a higher resolution(150DPI or above is recommended).