Vectr is completely free and browser-based, offering a quick and easy way to get started with vector editing through an intuitive interface. Since it's browser based, each image has a custom URL that you can share with others to be reviewed and collaborate in real time with multiple people. You can export your finished work as an SVG, PNG, or JPEG file. Its features are much more simple than those offered by Illustrator, so it's really not recommended for very complex projects. However, it is an excellent choice if you are a beginner with vector editing software.
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Vectr has a great user interface and has lots of tools to fine tune designs. They have plenty of numerical value boxes to get better results with what you want and have an easy to learn interface. I have used it for quite a few projects. Great to make new icons with too! Love it!