This document specifies which browsers are supported by the various features of the Instart service. All features listed are available as part of our core service except where indicated.

FeatureBrowser SupportAdditional notes
JPG Image TranscodingAllDisabled for iOS 5 devices due to an iOS bug with rendering large progressive JPGs.
PNG Image TranscodingAll
JPG Image Transcoding with SmartVisionAll
JPG to WebP Image Transcoding with SmartVisionChrome 23+
JPG Image Quality ClampingAllThis is our previous-generation technology before SmartVision.
JPG to WebP Image TranscodingChrome 23+
PNG to WebP Image TranscodingChrome 23+
JPG to JPEG XR Image TranscodingIE 10+
PNG to JPEG XR Image TranscodingIE 10+
HTML StreamingChrome 43+
FireFox 38+
IE 11+
Safari 8 - 9.1
iOS 8 - 9.4
Chrome on Mobile 35+
Disabled for Windows XP. Disabled for Chrome on iOS.
JavaScript StreamingChrome 43-45
FireFox 38-40
IE 11
Safari 8+
iOS 8+
Disabled for Windows XP. Disabled for Chrome on iOS.
Dynamic CachingAllNormal browser user agents; bot/crawler user agents not currently supported.
Real User Monitoring (RUM)Chrome 43-45
FireFox 38-40
IE 11+
Safari does not support browser timing APIs. Disabled for Chrome on iOS.
JPEG/PNG/GIF Image Adaptation APIAllThis is an extra cost item, please contact us if you wish to turn it on.
Web Application Firewall (WAF)AllThis is an extra cost item, please contact us if you wish to turn it on.