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About HDMI Forum, Inc.

The HDMI Forum, Inc. is comprised of the world’s leading manufacturers of consumer electronics, personal computers, mobile devices, cables and components. An open trade association, The HDMI Forum’s mission is to foster broader industry participation in the development of future versions of the HDMI specification and to further expand the ecosystem of interoperable, HDMI-enabled products. The HDMI Forum currently has a membership of over 80 companies.
HDMI 2.1 Specification was developed by the HDMI Forum’s Technical Working Group.
For more information, please visit

HDMI Specification 2.1 is the most recent update of the HDMI specification featuring advanced features for the HDMI eco-system. It supports a range of Higher Video Resolutions and refresh rates including 8K60 and 4K120, Dynamic HDR, and increased bandwidth with a new 48G cable. Version 2.1 of the HDMI Specification is backward compatible with earlier versions of the Specification.
HDMI Specification 2.1 Feature Highlights Include:

The new specification will be available to all HDMI 2.0 Adopters and they will be notified when it is released early in Q2 2017.


Q: What is the testing policy for HDMI 2.1 products?
A: An Adopter’s first product in a designated product category that implements any function of the HDMI 2.1 Specification needs to be submitted to an ATC for testing and pass all applicable and available HDMI compliance tests before shipment. An Adopter’s subsequent product in a designated product category that implements any additional function of the HDMI 2.1 Specification should be submitted to an ATC for testing and pass all applicable and available HDMI compliance tests before shipment.
Q: What are the testing requirements for HDMI 2.1 Specification?
A: Compliance testing will continue to be an essential aspect to the success of the HDMI Specifications. When the HDMI 2.1 Specification is released, it will be accompanied by a new Compliance Testing Specification (CTS 2.1). All 1.4b products will continue to be tested to CTS 1.4b. Refer to the website for testing requirements.
Q: When will the HDMI 2.1 Compliance Test Specification be available?
A: The HDMI 2.1 Compliance Test Specification (CTS) will be published in Q2-Q3 2017.
Q: When will ATCs start to provide 2.1 testing services?
A: Each individual ATC will decide on when to offer HDMI 2.1 testing services. Please contact your local ATC for more information.
Q: What is the relationship of HDMI Specification 2.1 to HDMI 2.0b and 1.4b Specifications?
A: HDMI 2.1 Specification supersedes 2.0b and 2.1 continues to make reference to, and rely upon, HDMI 1.4b Specification.
Q: Is HDMI 2.1 Specification backwards compatible with previous versions of the specification?
A: Yes.
Q: How do you license HDMI 2.1 Specification?
A: In order to license the HDMI 2.1 Specification, you must first become an HDMI Adopter and then sign an addendum to the HDMI Adopter Agreement which provides a license to the HDMI 2.0 Specification.
Q: Can non-HDMI Adopters license only the HDMI 2.1 Specification?
A: Companies wishing to use the HDMI 2.1 specification must become an HDMI Adopter and also sign the HDMI 2 Adopter Addendum. They will have access to HDMI 1.4b and HDMI 2.1 Specifications.
Q: If I am a current HDMI 1.4b Adopter, do I have to license HDMI 2.1 Specification?
A: No, Adopters have the option to only license 1.x.
Q: Do HDMI 2.0 Adopters automatically get access to HDMI 2.1 Specification?

A: Yes it is licensed under the Version 2 addendum.
Q: Will current Adopters be required to pay an additional Annual Fee if they choose to adopt the HDMI 2.1 Specification?
A: No.
Q: Will there be any new royalty and/or increase in current royalties for products that implement HDMI 2.1 Specification features?
A: No there is no additional royalty for implementing the HDMI 2.1 Specification.
Q: Where can I download the HDMI 2.1 Specification?
A: HDMI 2.1 Specification can be downloaded from the Adopter Extranet.

Feature FAQS

High Video Resolutions
Q: Will 8K@60 or 4K@120 require a new cable or cable connector?
A: Yes a new cable is required
Q: What are the support resolutions and frame rates?

Q: What colorimetry is supported?
A: HDMI 2.1 Specification supports the latest color spaces including BT.2020 with 10, 12, and 16 bits per color component.
48G Cable
Q: Is this cable required for delivering HDMI 2.1 Specification features?
A: The cable is the best way to ensure the high-bandwidth dependent features are delivered including the enhanced video and audio performance, and accounting for the new EMI characteristics
Q: Will existing HDMI High Speed cables deliver the HDMI 2.1 features also?
A: While existing HDMI High Speed Cables with Ethernet can deliver some of the new features, the new cable is the best way to connect HDMI 2.1 enabled devices to ensure delivery of all the features.
Q: What connectors does this cable use?
A: It is compatible with HDMI connectors Types A, C and D.
Q: Does the cable have an Ethernet channel?
A: Yes it supports the HDMI Ethernet Channel.
Q: Can this new cable work with existing HDMI devices?
A: The cable is backwards compatible and can be used with existing HDMI devices for the delivery of legacy HDMI features.
Dynamic HDR
Q: Does this Dynamic HDR require the new 48G Cable?
A: No, but it will be necessary to enable 8K video with HDR
Q: Does the specification support the various HDR solutions?
A: Yes it supports various static and dynamic HDR solutions in the market
Q: Is this accessible via a firmware upgrade?
A: Manufacturers will be implementing this in various ways

Q: Will this work with any HDMI cable?
A: This works with HDMI High Speed Cables with Ethernet and the new 48G cable
Q: Is this available through a firmware upgrade?
A: Depends on manufacturer implementation

Game Mode VRR
Q: Does this require the new HDMI cable?
A: No
Q: Will this work with 8K@60 or 4K@120Hz?

A: Yes if those features are implemented along with Higher Video Resolution. That will require the new 48G cable
Q: Is this primarily for consoles or will PCs utilize this also?
A: It can be used for both.
Q: Will this result in more gaming PCs connecting to HDMI displays, either monitors or TVs?
A: The intent of the feature is to enable HDMI technology to be used in these applications. Given that HDMI connectivity already has a strong presence in this area, we expect that use of HDMI technology in gaming will continue to grow.

Want to contribute? JOIN THE HDMI FORUM

This is your chance to contribute to the world’s de facto connectivity standard for uncompressed HD and UHD video, multi-channel surround audio, and advanced control data. The HDMI Forum is looking for those companies who want to contribute to the next version of the HDMI specification.
Membership information can be found on the HDMI Forum website,

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