ASL Overlay & Closed Captioning for Inclusive Video Content 

In today’s digital world, video has become one of the most effective ways to communicate. Whether you’re sharing employee training, educational content, marketing campaigns, safety information, or social media videos, accessibility should be part of your production process—not an afterthought. 

At Deaf Services Unlimited (DSU), we help organizations make their pre-recorded videos accessible through ASL overlay services and closed captioning. These post-production accessibility services ensure your content is easier to understand, more inclusive, and reaches a wider audience. 

If your organization creates videos, adding American Sign Language (ASL) interpretation and closed captions can make a meaningful difference for viewers of all abilities. 

What Are Post-Production Accessibility Services? 

Post-production accessibility refers to accessibility features that are added after a video has been recorded. Unlike live interpreting or CART captioning, these services are incorporated during the editing process so the final video is fully accessible before it is published. 

At DSU, our post-production services include: 

• ASL Interpreter Overlay  

• Closed Captioning  

• ASL Overlay and Closed Captioning Together  

Because every video is different, our post-production projects are quoted case-by-case based on factors such as video length, turnaround time, editing requirements, and formatting needs. 

Ready to make your videos accessible? Request a personalized quote through our Post-Production Request Form. 

What Is ASL Overlay? 

ASL overlay places a professionally recorded American Sign Language interpreter directly onto your video. The interpreter is positioned on-screen so Deaf viewers who use ASL can receive information in their preferred language while still viewing the original video content. 

Unlike simply adding captions, an ASL overlay provides information in a complete visual language with its own grammar and structure. 

This distinction is important because American Sign Language is not a signed version of English. Many Deaf individuals consider ASL their primary language, making interpreter overlay one of the most effective ways to provide meaningful access. 

Organizations commonly use ASL overlay services for: 

• Employee training videos  

• Educational materials  

• Marketing campaigns  

• Public announcements  

• Government communications  

• Healthcare education  

• Nonprofit outreach  

• Website videos  

• Social media content  

Adding an ASL interpreter directly into your video demonstrates a commitment to accessibility and inclusion while helping Deaf audiences engage with your content more naturally. 

What Is Closed Captioning? 

Closed captioning displays synchronized text that represents spoken dialogue and relevant audio information throughout a video. 

Unlike subtitles, which generally translate spoken dialogue into another language, closed captions are designed specifically for accessibility. They include spoken words as well as meaningful sounds, speaker identification, and other audio cues when appropriate. 

Closed captions allow viewers to: 

• Read spoken dialogue  

• Follow conversations in noisy environments  

• Watch videos without sound  

• Improve comprehension of technical or fast-paced information  

• Better retain important information  

Closed captioning benefits far more people than many organizations realize.

Why Use Both ASL Overlay and Closed Captioning? 

One of the biggest misconceptions about video accessibility is that organizations need to choose either ASL interpretation or captions. 

In reality, many videos benefit from having both. 

ASL overlay and closed captions serve different communication needs. 

For many Deaf individuals who primarily communicate through ASL, interpreter overlay provides information in their native language. Meanwhile, captions support viewers who are hard of hearing, late-deafened, or simply prefer reading along with spoken content. 

Using both accessibility features allows organizations to reach a broader audience while recognizing that communication preferences vary from person to person. 

Rather than treating accessibility as a one-size-fits-all solution, combining services creates a more inclusive viewing experience.

Accessibility Benefits More Than the Deaf Community 

Although ASL overlay and closed captioning are essential accessibility tools for Deaf and hard-of-hearing viewers, their benefits extend much further. 

Accessible videos can improve communication for many audiences, including:

Neurodivergent Individuals 

Many people with ADHD, autism, dyslexia, auditory processing differences, or other neurodivergent conditions find captions helpful for following conversations and retaining information. 

Reading along while listening can reduce cognitive load and improve focus during educational or informational videos. 

Hearing Viewers 

Even hearing individuals frequently use captions. 

People often watch videos: 

• In quiet offices  

• On public transportation  

• In waiting rooms  

• Late at night  

• While multitasking  

• In noisy environments  

Captions allow viewers to continue engaging with content even when audio isn’t practical. 

Research has also shown that captions can improve comprehension and information retention for many hearing viewers, especially when topics are technical or unfamiliar. According to a study done by San Francisco State University, captions increase comprehension up to a full letter grade and clarify messages by 25%. Read more on captioning studies and their influence on retention HERE.

English Language Learners 

Closed captions also support individuals learning English by reinforcing vocabulary, pronunciation, and sentence structure while they listen. 

Why Organizations Are Investing in Accessible Videos

Video accessibility is becoming an increasingly important part of organizational communication. 

Whether you’re serving customers, patients, students, employees, or community members, accessible videos demonstrate that everyone deserves equal access to information. 

Organizations are adding ASL overlays and captions to: 

• Employee onboarding videos  

• HR training  

• Safety training  

• Educational courses  

• Conference presentations  

• Product demonstrations  

• Public service announcements  

• Healthcare education  

• Marketing videos  

• Social media campaigns  

Building accessibility into your video library from the beginning helps ensure your content remains usable for a diverse audience long after it’s published. View examples of DSU’s Post-Production Products on our gallery HERE.

Why Choose DSU for Post-Production Accessibility? 

At Deaf Services Unlimited, accessibility isn’t simply an editing service—it’s our specialty. 

Our team understands the importance of creating videos that are both professional and accessible. We work with organizations across industries to integrate accessibility features seamlessly into existing video content. 

Our post-production services include: 

• Professional ASL interpreter overlay  

• Accurate closed captioning  

• Combined ASL overlay and captions  

• High-quality video editing  

• Customized project quotes  

• Flexible turnaround options  

Every project is unique, which is why we provide individualized quotes based on your video’s specific needs rather than a one-size-fits-all pricing model. 

Whether you’re updating a single training video or making an entire video library more accessible, our team can help identify the right solution for your audience. 

Make Your Videos More Accessible 

Accessible communication doesn’t stop when filming ends. 

Adding ASL overlay and closed captioning during post-production helps ensure your message reaches more people while supporting inclusive communication practices. 

By making your videos accessible, you’re creating content that is easier to understand, more engaging, and more welcoming for Deaf, hard-of-hearing, neurodivergent, and hearing audiences alike. 

If you have existing videos that could benefit from accessibility features, DSU is here to help. 

Because every project is different, post-production services are quoted on a case-by-case basis. Complete our Post-Production Request Form to receive a personalized quote and learn how ASL overlay and closed captioning can make your videos more accessible for every viewer.

Q&A 

1. What is an ASL overlay for videos? 
An ASL overlay adds a professionally recorded American Sign Language interpreter directly onto a pre-recorded video, making the content accessible for Deaf individuals who use ASL as their primary language. 

2. What is the difference between closed captions and subtitles? 
Closed captions are designed for accessibility and include spoken dialogue plus relevant sound information, while subtitles typically translate dialogue for viewers who can hear the audio but speak a different language. 

3. Can a video have both an ASL interpreter and closed captions? 
Yes. Many organizations choose to include both an ASL interpreter overlay and closed captions to accommodate different communication preferences and create a more inclusive viewing experience. 

4. Why should businesses add ASL overlay and closed captioning to videos? 
Adding ASL overlay and closed captioning helps organizations improve accessibility, reach Deaf and hard-of-hearing audiences, support neurodivergent viewers, enhance comprehension, and create more inclusive video content.