1.2.6 Sign Language (Prerecorded)

1. What is the goal of this criterion?

Imagine watching an exciting explainer video – but the captions race past while the speaker talks enthusiastically about the topic. You understand the words, but the emphasis, the irony and the small pauses that bring it to life barely come across.

That’s the experience of many deaf people whose first language is a sign language. For them, captions are text in a second language – helpful, but not always the most direct route to the content.

So the goal of Success Criterion 1.2.6 is to add sign language interpretation to videos. That way, content isn’t just accessible – it’s delivered in a full language of its own.

2. What exactly does it require?

In concrete terms, this Level AAA criterion requires all audio content in prerecorded videos to be interpreted into sign language as well.

In practice, that means:

Complete interpretation of the audio: not only spoken words, but also relevant sounds, music and mood are conveyed in sign language.

Synchronisation: the interpretation runs alongside the video – with the slight delay that’s natural in interpreting, but without falling behind.

Visible integration: the interpreter appears either directly in the video (for example in a separate picture area) or as a separate, synchronised video that can be switched on.

Understandable quality: WCAG doesn’t prescribe how the interpretation is produced. What counts is that it’s complete and understandable for the audience – which in practice means qualified sign language interpreters.

As a Level AAA criterion, it’s usually not mandatory – but it stands for particularly inclusive media.

3. Why does it matter for accessibility?

Imagine knowing two languages – one is your mother tongue, the language you think and feel in. You learned the other one later; you understand it, but it always feels a little foreign. That’s how it is for many people whose first language is a sign language.

Sign language interpretation creates accessibility because it:

Conveys expression: through facial expression and body language, sign language carries emotion, irony and nuance that often get lost in captions.

Offers a natural pace: many sign language users take in content more easily in their first language than by reading fast captions.

Makes complex content clearer: technical terms, metaphors and abstract concepts can be explained deliberately in sign language.

Helps people with reading difficulties: not all deaf people read with the same confidence – sign language is often their most direct route to information.

Creates inclusive experiences: videos with sign language interpretation show that people’s preferred way of communicating is respected.

4. How to meet the criterion

The good news: technically, sign language interpretation is very doable today. The biggest challenge lies in planning and coordination. Here’s how to approach it:

Find qualified interpreters:

• Work with qualified sign language interpreters – not amateurs or learners.
• Choose the right sign language for your audience: American Sign Language (ASL), British Sign Language (BSL), German Sign Language (DGS) and so on – sign languages are not international.
• Book interpreters with experience in your field – technology, medicine and law each have their own vocabulary. Share scripts and terminology in advance.

Technical implementation:

• Picture-in-picture: the interpreter appears in a section of the video – usually bottom right or left.
• Separate video: offer a version with a large interpreter view that users can choose or switch on when they need it.
• Mobile display: make sure the interpreter stays large enough on small screens too.

Quality checklist:

• Visibility: the interpreter must be clearly visible – good lighting, a calm background with contrast, enough size, face and hands fully in frame.
• Signing space: allow enough room for arm and hand movements – roughly from the hips to above the head.
• Synchronisation: the interpretation must match what’s being said.

Workflow tip: the easiest approach is to plan interpretation during video production. Adding it later is possible, but more work. You still need captions under Captions (Prerecorded) – sign language complements them, it doesn’t replace them.

5. Why this criterion matters for businesses

Level AAA may sound optional – but sign language shows that what makes access possible for some people signals quality to everyone. Three arguments:

1. Speak to an audience directly

Deaf people whose first language is a sign language are rarely addressed directly by most offerings. A video with sign language interpretation says: “We see you and we respect your language.”

2. Sharpen your profile

Sign language interpretation is a visible sign of quality and inclusion. It shows a company is willing to go a step further than required.

3. Legal context

What the law usually requires is Level AA: the European Accessibility Act, in force for many consumer products and services since 28 June 2025 and implemented in Germany by the Barrierefreiheitsstärkungsgesetz (BFSG), relies on EN 301 549, which refers to WCAG 2.1 Level AA for web content. So 1.2.6 isn’t part of the mandatory scope. That said, Germany’s BITV 2.0 does require federal public bodies to provide explanations in German Sign Language on their websites – not the same as 1.2.6, but it shows how much weight sign language carries. (General information, not legal advice.)

6. The success criterion in the W3C’s words

Success Criterion 1.2.6 Sign Language (Prerecorded) (Level AAA)

Sign language interpretation is provided for all prerecorded audio content in synchronized media.

In short: all audio content in prerecorded videos is also interpreted into sign language.