What is a video sales letter?
A video sales letter (VSL) is a short video that does the job of a sales page: it names the buyer's problem, explains why it keeps happening, presents your offer, proves it and asks for one action. The script is the spoken copy, written line by line with timings. In B2B it is usually one person talking to camera, sometimes over slides or a screen recording, and it sits where a buyer decides whether to book a call.
It is easy to confuse with three other videos. Pick the one that matches the job:
| Video | Job | Who watches | Ends with |
|---|---|---|---|
| Video sales letter | Persuade someone who doesn't know you yet that a call is worth it | Landing page visitors, cold prospects | One action: book a call, reply, start |
| Product demo | Show how the product solves a problem already discussed | Buyers mid-deal | A decision or a trial |
| Explainer | Teach what the product does | Anyone on the site | Usually no hard ask |
| Personal outbound video | Speak to one named prospect about their situation | One person | A reply |
The table is our own split. If a buyer has already told you their problem, you probably want a demo instead; our guide to running a demo that isn't a feature tour covers that.
How long should a B2B video sales letter be?
Aim for two to four minutes for a cold audience and keep it under six. That is our recommendation, based on two sets of watch-time data that point the same way:
| Study | Sample and date | What it found |
|---|---|---|
| Philip J. Guo (MIT CSAIL and University of Rochester), Juho Kim (MIT CSAIL) and Rob Rubin (edX), ACM Learning at Scale conference (academic) | 6.9 million video-watching sessions in four edX courses from autumn 2012, published March 2014 | Median engagement time was at most 6 minutes, however long the video. Viewers often got less than halfway through videos over 9 minutes. For videos of 0 to 3 minutes, 75% of sessions lasted over three quarters of the video |
| Wistia (video hosting vendor), blog post of 1 July 2025 | Over 13 million videos uploaded to Wistia, from its 2026 State of Video report | Videos under a minute averaged a 52% engagement rate, which Wistia says means viewers typically watch half the video's length. Engagement declines after five minutes, with an 11% drop past 30 minutes |
Neither is a study of sales videos. Guo's study measured students in maths and science courses, who the authors note may be more self-motivated than typical viewers, and engagement time can't tell whether someone was paying attention. Wistia's data is the company's own, and the post doesn't give its method in detail. Buyers watching a sales video owe you nothing, which suggests erring short.
To turn length into words, use speaking rate. Speaking rates in Guo's videos ranged from 48 to 254 words per minute, with a mean of 156. At a comfortable 150 words per minute, a 3-minute VSL is 3 x 150 = 450 words, and a 2-minute one is 300. Write to the word count, then read it aloud with a timer.
What is the structure of a video sales letter script?
Eight parts, in this order. Timings are for a 3-minute (180-second) script; word counts assume 150 words per minute, so each second is 2.5 words. The structure and timings are our template for B2B services, not a tested formula.
| Part | Time | Seconds | Words (seconds x 2.5) | What it does |
|---|---|---|---|---|
| 1. Hook | 0:00 to 0:10 | 10 | 25 | Names who it's for and the problem, in their words |
| 2. Problem | 0:10 to 0:35 | 25 | about 63 | Describes what the problem looks like day to day |
| 3. Cost | 0:35 to 0:55 | 20 | 50 | What it costs them in hours, money or missed work |
| 4. Why it keeps happening | 0:55 to 1:20 | 25 | about 63 | The cause they haven't named yet |
| 5. The offer | 1:20 to 2:00 | 40 | 100 | What you do, step by step, and what they get |
| 6. Proof | 2:00 to 2:30 | 30 | 75 | One specific result, with its context |
| 7. Fit | 2:30 to 2:45 | 15 | about 38 | Who it is not for, and what it costs to start |
| 8. Call to action | 2:45 to 3:00 | 15 | about 38 | One action, said twice, shown on screen |
The rows add up to 180 seconds and about 450 words. If you cut to two minutes, shorten the problem, cost and offer sections, and keep the hook and the call to action at full length.
Video sales letter script example for a small B2B service
Here is the template filled in for a made-up company, Northwind Ltd, a bookkeeping service for marketing agencies with 5 to 30 staff. Every name, number and result in it is invented for the example. Its spoken lines run to about 315 words, a little over two minutes at 150 words a minute (315 / 150 = 2.1), so it is a trimmed version; the time stamps show where each part starts at that pace. Add detail to the offer and proof if you want the full three minutes.
Notice what the proof section does: it names the client's relationship to the seller and says what most clients get. The next section explains why.
Can you use testimonials and results in a VSL?
Yes, but in the US the Federal Trade Commission's Endorsement Guides, its interpretation of how the FTC Act applies to endorsements and testimonials, cover what is said and shown on screen as well as text. Part 255 doesn't single out business-to-business ads (checked 5 Nov 2026). This is a summary, not legal advice; check with a lawyer if your VSL makes results or income claims. From 16 CFR Part 255 (revised July 2023):
- Typical results. A testimonial about a key result will likely be read as what buyers will generally get. If you can't back that up, you should clearly disclose the generally expected result (section 255.2(b)). The Guides' own example says lines like "Results not typical" are insufficient on their own.
- Connections. If the person in the testimonial got a discount, free work, payment or has a family or business tie to you, and viewers wouldn't expect it, disclose it clearly (section 255.5).
- Exact words. Quotation marks, on screen or implied, mean the endorser's exact words. Otherwise don't reword their view in a way that distorts it (section 255.1(b)).
- Where the disclosure goes. If a claim is made in both sound and picture, the Guides say the disclosure should be made in both, and that one shown and said at the same time is more likely to be clear and conspicuous (section 255.0(f)). For a VSL, say it and put it on screen.
Be careful with income claims if you sell anything that promises buyers more revenue or profit. On 26 October 2021 the FTC sent a notice to more than 1,100 businesses, including business coaching providers, warning that false, misleading or deceptive claims about profits or earnings, including that profits are typical, could bring civil penalties of up to $43,792 per violation at that time. A B2B service is not automatically a money-making opportunity, but the principle is the same: claim what most clients get, and keep the evidence.
Talking head, slides or screen recording?
Use a talking head for most of it, and cut to slides or a screen recording only when you need to show something. The best evidence again comes from Guo's edX study, so read it as a guide to attention, not to sales:
| Choice | What Guo's study found | For a B2B VSL (our view) |
|---|---|---|
| Talking head with slides vs slides alone | Students usually engaged more with videos that alternated between the instructor's face and slides | Open and close on your face; cut to a slide for numbers |
| Informal desk vs studio | An instructor filmed close up at a desk got more engagement than one at a podium in a TV studio; the authors warn it is one pair of courses | A good webcam, quiet room and eye contact beat a hired studio |
| Speaking pace | Within a length range, engagement usually rose with speaking rate; the authors link it to enthusiasm, not speed itself | Don't slow down on purpose; edit out ums and long pauses |
| Planning | Lectures planned for video got more engagement than old lectures chopped up afterwards | Write the script first; don't cut a webinar into a VSL |
Do you need captions on a video sales letter?
Yes. Many viewers will see it with the sound off: LinkedIn says its video ads autoplay in the feed with the sound muted by default, and strongly recommends captions for that reason. If you post the video natively, our guide to posting a video on LinkedIn covers the upload steps.
Captions also help people who watch with sound. A 2015 review by Morton Ann Gernsbacher of the University of Wisconsin-Madison, in Policy Insights from the Behavioral and Brain Sciences, says more than 100 empirical studies show captioning a video improves comprehension of, attention to and memory for it. Most of those studies were in education, not marketing. On your own site, the W3C's accessibility standard WCAG 2.2 makes captions for prerecorded video a Level A success criterion.
Three practical rules: upload a caption file or check auto-captions line by line, because product and client names are where they go wrong; put your call to action on screen as text, not only in speech; and make the first frame readable without sound, since that is what a muted viewer judges.
Where do VSLs fit in B2B sales?
In three places, each with a different length and ask:
- Landing page. Put the VSL above the fold with the booking button directly under it, and repeat the key claims in text for people who won't press play. Two to four minutes.
- Outbound follow-up. When a prospect replies "send me more info", a two-minute version can answer it, followed by one question. Our guide to what to send after "send me more info" has the full reply.
- Before a booked call. Send a short version with the confirmation so the buyer arrives knowing the basics, and the call can start with their situation instead of your introduction. Ninety seconds is enough.
This week: write the hook and call to action for your offer, fill the six middle parts to about 450 words, record it once on a webcam, and watch it back with the sound off. If the captions and on-screen text don't carry the message alone, fix those before you film again.
Frequently asked questions
How long should a video sales letter be?
For a B2B audience that doesn't know you yet, two to four minutes is a sensible target, and under six is a good ceiling. Watch-time research on online video, including a study of 6.9 million sessions on edX, found engagement falls off for longer videos. Warm audiences who asked for details will sit through longer, more detailed videos.
How many words is a three-minute video script?
At a comfortable speaking pace of about 150 words per minute, a three-minute script is around 450 words. A two-minute script is about 300 words and a five-minute one about 750. Read the draft aloud with a timer before recording, since people speak at very different speeds.
What is the difference between a VSL and a demo video?
A VSL persuades someone who doesn't know you that a conversation or purchase is worth it, so it spends most of its time on the problem and the proof. A demo shows how the product solves a problem the buyer has already described, so it spends most of its time inside the product.
Do video sales letters work for B2B?
They can, when the offer is simple enough to explain in a few minutes and the video sends viewers to one clear next step, usually booking a call. They work less well for complex products with many buyers involved, where a live discovery call and a tailored demo do more of the work.
Should a VSL autoplay on a landing page?
If it autoplays, many viewers will see it muted, as LinkedIn says happens with its feed video ads, so make sure the first frame and captions make sense without sound. Many B2B pages use a clear thumbnail with a play button instead, so the visitor chooses to watch. Test both on your own page and compare bookings, not views.
Sources
- Guo, Kim and Rubin, How Video Production Affects Student Engagement: An Empirical Study of MOOC Videos, L@S 2014 (March 2014; checked 5 Nov 2026)
- Wistia, What's the optimal video length? (1 Jul 2025; checked 5 Nov 2026)
- Gernsbacher, Video Captions Benefit Everyone, Policy Insights from the Behavioral and Brain Sciences (PMC) (1 Oct 2015; checked 5 Nov 2026)
- W3C, Understanding Success Criterion 1.2.2: Captions (Prerecorded), WCAG 2.2 (checked 5 Nov 2026)
- LinkedIn Marketing Solutions, Video Ads (checked 5 Nov 2026)
- eCFR, 16 CFR Part 255, Guides Concerning the Use of Endorsements and Testimonials in Advertising (88 FR 48102, 26 Jul 2023; checked 5 Nov 2026)
- FTC press release, FTC Puts Businesses on Notice that False Money-Making Claims Could Lead to Big Penalties (26 Oct 2021; checked 5 Nov 2026)