Open Source Photo PNG Ratio 
BrightCarbon
JANUARY 7, 2019
Changing slide size: Google Slides defaults to the standard widescreen 16:9 aspect ratio. The standard 16:9 aspect ratio is widely used because it fits perfectly on most widescreen screens and projectors. If you want to resize your object without it being warped or stretched, check the Lock aspect ratios box.
BrightCarbon
APRIL 20, 2020
per month): Access to photo and element library, fonts, and priority support. With Canva you get access to a huge amount of assets: 2 million photos, 500,000 illustrations and icons, 20,000+ templates, 500+ fonts and so on. You can record narration, change the screen ratio, add videos, images, and audio. Free (free!).
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