Are text-heavy slides really “more complete”?

When recording lecture videos, many instructors share the same concern:

• “If I put too little text, students might not understand.”
• “If I add more text, the slide will feel more complete, right?”

It sounds reasonable — but in reality, the opposite is often true.

👉 The more text on a slide, the harder the video is to learn from.

In this article, you’ll understand:

• Why text-heavy slides don’t work well in video lectures
• The difference between presentation slides and video slides
• How many words per slide is “just right”

1. Why does the amount of text on a slide matter in videos?

Slides in video lectures don’t function the same way as in live presentations.

When learning through video:

• Learners can’t ask questions immediately
• They don’t see the full classroom context
• They often watch on smaller screens
• Their attention span is shorter
• They may be multitasking

📌 In video lectures, slides are not meant to contain all the content — they support the spoken explanation.

2. Slides for video ≠ slides for documents

This is one of the most common mistakes.

• Document slides → meant for reading, storing, and referencing
• Video slides → meant to support speech and guide learning flow

When you try to “fit everything” into slides:

• Slides become text-heavy
• The video turns into… someone reading a document aloud

👉 This removes the biggest advantage of video: your voice, delivery, and guidance.

3. So, how many words per slide is appropriate?

There’s no universal number, but there is a safe range.

General principle

If learners can glance quickly and understand the main idea, the slide is at a good level.

Practical guidelines

• Each slide should focus on one main idea
• The text should only:
  • Trigger memory
  • Highlight key points
  • Guide your explanation

📌 The fewer words on the slide, the more room you have to teach with your voice.

4. Signs your slides have too much text

Ask yourself:

• Do you have to read almost everything on the slide?
• Did you shrink the font to fit more content?
• Does one slide contain multiple main ideas?
• Is the text hard to read on smaller screens?

If you answer “yes” to 2 or more, your slide is likely overloaded.

5. Why less text matters even more in video

There are 3 key reasons:

1. The brain struggles with two streams of text

Viewers are:

• Listening to your voice
• Reading the slide

If there’s too much text → the brain drops one.

And usually… it drops the speaker.

2. Too much text reduces the feeling of being “taught”

Effective learning videos create the feeling:

“Someone is explaining this to me.”

Too much text makes the video feel like:

• A document
• An ebook being read aloud

3. Less text = easier editing and reuse

Clean slides are:

• Easier to turn into short clips
• Easier to reuse for social content
• Easier to update without redoing the entire video

6. How to reduce text without losing content

1️⃣ Split content into multiple slides

Instead of:

• 1 slide → 1 long paragraph

Use:

• 2–3 slides
• Each slide → 1 idea

📌 Videos are not limited by slide count like live presentations.

2️⃣ Move explanations into your voice

Slides should contain:

• Keywords
• Short phrases
• Bullet points

The following should be spoken:

• Explanations
• Examples
• Analysis

3️⃣ Separate “teaching slides” and “reference materials”

In a course, you can:

• Use minimal slides for video teaching
• Provide additional materials:
  • PDFs
  • Downloadable documents
  • Notes below the video

This approach is commonly used in long-term courses to:

• Keep videos easy to watch
• Still provide complete learning materials

Conclusion

There’s no single “perfect number” for every slide.

But for video lectures, remember:

• Slides are not a script
• Slides are not full documents
• Slides are tools to help learners listen better

When you reduce text on slides:

• Videos become easier to follow
• Learners stay more focused
• Content is better understood

And most importantly:

👉 Your knowledge is delivered effectively — not buried under text.