How to Turn Lecture Slides into a Study Video
Lecture slides are the skeleton of a lecture with the explanation taken out, which is why they are so hard to study from. Here is how to get the text out of any deck, put the missing explanation back from your notes or the lecture transcript, and turn it into a narrated, drawn study video.
By openCanviz • September 25, 2026
7 min read
To turn lecture slides into a study video, copy the text out of the deck (outline view in PowerPoint, a plain-text download in Google Slides, or select-all in a PDF), then add back the explanation the slides leave out, from your own notes or the lecture recording's transcript. Paste the result into a document-first tool like openCanviz, set a length, and it drafts one short chapter per idea with narration and a drawing that builds as each point is made. The step that decides whether the video is any good is the second one. Slides on their own are headlines, and a video made from headlines is a video of someone reading bullet points aloud.
Why slides are so hard to study from
A lecturer's slides are written to be talked over. The bullet says "Keynesian multiplier: 1/(1-MPC)" and the lecturer spends four minutes explaining why a spending increase ripples outward, with an example about a new factory. The four minutes were the lecture. The bullet is a reminder for the person giving it.
So when you open the deck three weeks later, you are looking at the prompts for an explanation you no longer remember. That is also why a video made straight from the slides disappoints: it faithfully narrates the prompts.
The fix is to rebuild the explanation before you make anything. You have more material for this than you think.
Where the missing explanation lives
The lecture recording's transcript. Most lecture capture systems (Panopto, Echo360, Zoom, Teams, and YouTube for public lectures) generate a transcript automatically. It is messy and full of "um, so, right", but it contains the actual explanation, in the order it was given. This is the single best source, and most students never open it.
Your own notes. Even sparse notes usually hold the example the lecturer used, which is often the thing the exam asks you to apply.
The speaker notes. Some lecturers write full sentences under each slide. If the deck has them, they come out with the slide text.
The reading for that week. Use it to fill one specific gap, not as a second source for everything.
Getting the text out
| Deck format | How to get the text |
| PowerPoint (.pptx) | View, then Outline View, then select all and copy. Speaker notes come from File, Export, or Notes Page view. |
| Google Slides | File, then Download, then Plain text (.txt). Speaker notes need copying slide by slide. |
| Keynote | File, then Export To, then PDF with presenter notes, then copy from the PDF. |
| PDF handout | Select all and copy. Expect broken line endings; they do not matter. |
| Photos of slides | Most phones can copy text straight out of a photo. Check numbers and symbols by eye afterwards. |
Do not spend time tidying the formatting. Line breaks, stray page numbers and bullet characters make no difference to the draft. Equations are the one exception: write them out in plain words or simple notation, because a formula that came out of a PDF as a jumble of symbols will be narrated as a jumble of symbols.
How long it will run
Narration runs at about 150 words a minute. A typical lecture deck has 25 to 40 slides and, once the explanation is put back, somewhere between 900 and 1,500 words worth keeping.
| Source | Words after rebuilding | Runtime | Chapters |
| One lecture, slides only | 300 to 500 | 2 to 3 min | 5 to 8 |
| One lecture, slides plus transcript extracts | 900 to 1,500 | 6 to 10 min | 12 to 20 |
| A week's two lectures | 1,800 to 2,500 | 12 to 17 min | 25 to 35 |
The first row is the trap. A two-minute video from a fifty-minute lecture is not a summary, it is a list of topic names. If your draft comes out that short, the explanation is missing and the video will not teach you anything.
Make it
- 1
Export the slide text
Use the table above. Keep the slide titles; they become your first draft of chapter names.
- 2
Pull the transcript for the hard slides only
Do not paste the whole transcript. Find the three or four slides you did not understand, and paste the stretch of transcript where the lecturer explained each one directly under it.
- 3
Add your example list
Every worked example from the lecture goes under the slide it belongs to. Examples are what make a drawn scene concrete rather than a floating label.
- 4
Delete the admin slides
Title slide, learning outcomes, reading list, the slide that says Questions? Cut them all.
- 5
Paste it in and set the length
Set the target minutes from the table and let it draft. Whiteboard style works well for lecture material because the drawing builds in step with the narration, the way the lecturer would have used a board.
- 6
Check every number, formula and definition
You will memorise whatever the video says. Compare each definition and formula against the original slide, and correct anything that drifted.
Slides the drawing will struggle with
Some slides do not turn into good drawn scenes, and it saves time to know which before you edit.
Dense data tables. A drawn scene can show the shape of a result (this went up, that stayed flat) but not a twelve-row table. Pick the one comparison that matters and state it.
Screenshots of software. A drawing of a user interface is worse than the screenshot. Describe what the software does instead.
Long derivations. Keep the starting point, the key step and the result, and narrate why the key step works. The algebra in between belongs on paper, where you can check it.
Is this allowed?
Using your lecturer's slides to make a study video for yourself is ordinary studying, no different from rewriting their notes by hand. Publishing it is different. The slides are usually the lecturer's or the university's copyright, so keep the video private, or share it only with your study group, unless you have asked.
What it costs
New accounts start with one hundred credits, which is roughly ten minutes of finished video, so a first lecture usually costs nothing. Free videos carry a watermark, which does not matter for something you are studying from. If you want a clean copy to share with your study group, a one-off payment unlocks that single project permanently.
Common questions
Can I just upload the .pptx file? Not directly. You paste the text, which is why the export table above exists. It takes a minute, and it is the moment you get to delete the admin slides.
Should I make one video per lecture or per topic? Per topic, if the course spreads a topic over several lectures. A video that follows one idea from start to finish is easier to revise from than one that stops wherever the lecture happened to end.
What if the lecture was not recorded? Then your notes and the week's reading carry the explanation. For each slide you do not understand, write two or three sentences of your own explaining it before you paste. If you cannot, that is the slide to take to office hours.
How does this differ from turning my own notes into a video? Your notes already contain your understanding, just compressed. Slides contain someone else's prompts. That is why slides need the rebuilding step and notes mostly need cutting. For notes, see how to turn class notes into a revision video.
Start with the lecture you understood least
Take the deck from the week that lost you, pull the transcript for the slides where it happened, and paste them in together. Ten minutes of drawn explanation of the part you missed beats a tidy video of the parts you already follow. It is free to start.
Turn any concept into an animated explainer
Type an outline, get a narrated, animated whiteboard video in minutes. No design skills, no timeline scrubbing. Free to start.
Keep reading
A research paper answers five questions, and a good summary answers the same five in about four minutes. Here is how to pull those answers out of any paper, turn them into a narrated drawn video for a seminar, journal club or your own reading, redraw the one figure that matters, and keep every number exact.
Most science concepts are one of four shapes: a process, a cycle, a comparison, or a change of scale. Here is how to write a short script around the right shape, turn it into a narrated drawn video, and check the one thing generated science drawings most often get wrong: the labels.
A textbook chapter is ten thousand words written to be read once, slowly. Here is how to turn an assigned chapter into a short narrated video that gives you its structure before you read it, what to keep from the chapter, how long the video should be, and why you still have to read the thing.
Rereading feels like learning and mostly is not. Video fixes some of that and makes one part worse. Here is what the evidence actually supports, where an explainer video genuinely beats a page of notes, and a study protocol that uses video for what it is good at without pretending watching is the same as knowing.