Techniques are disclosed for facilitating browser-based screen sharing using scripting computer language codes that are directly executable by a web browser. An example method comprises loading a presentation webpage in a presenter's web browser. The presentation webpage includes scripting language codes that are configured to cause the presenter's web browser to capture a screen image without requiring the presenter's web browser to load an applet. The method further includes receiving data indicative of the captured screen image from the presenter device, wherein the data is generated by the scripting language codes, processing the received data to form a processed screen image that is in an image format natively displayable to a viewer's web browser, and transmitting a viewer webpage including the processed screen image to the viewer's web browser.