How to turn lecture notes into a video

Lecture notes are a compressed record of something you heard once. Half-sentences, arrows, abbreviations that made sense at 10am on a Tuesday. Rereading them is one of the least effective ways to study, and most people know it, because the notes feel familiar long before the ideas are actually understood.

Turning them into a short video forces you, or a tool, to expand them back into a full explanation. Here's how to do it by hand, what that's good for, and how to get a video from a photo of your notes in a few minutes.

Why bother making a video from notes

Two different reasons, and they lead to different methods.

The first is learning. Explaining a topic out loud, as if to someone who missed the lecture, shows you exactly where your understanding has gaps. You hit a step you can't explain and realise you'd only memorised the words. That's the useful part, and it happens while writing the script, before any video exists.

The second is revision. A two-minute video of a topic is something you can rewatch on a bus, share with a study group, or watch the night before an exam when rereading ten pages is too much. Here the finished video is what matters, and it doesn't much matter who made it.

If you're after the first, do at least the script yourself. If you're after the second, generate it.

Option 1: Write a teach-back script and record it

This is the version that teaches you the most.

Pick one topic from the notes. One lecture usually holds several; a video per topic works better than one long video per lecture.
Without looking at the notes, write how you'd explain it to a friend who skipped class. Plain sentences, in order.
Now check against the notes and the textbook. Every place you got something wrong or left a gap is a thing to study. Fix the script.
Split it into scenes, one idea each, and sketch what goes with each: a diagram, a labelled drawing, an equation written line by line.
Record. The simplest setup is your phone pointed at a sheet of paper while you draw and talk. A tablet with a screen recorder works too, as does narrating over a few slides.

At about 150 spoken words per minute, a two-minute video is around 300 words of script. If your teach-back is much longer than that, it's probably two topics.

The good: this is active recall and self-explanation in one exercise, and the script is a better study sheet than the original notes. The bad: it's slow, and recording yourself is awkward for most people. Worth it for the topics you find hardest, not for every lecture.

Option 2: Clean up the notes and use a slideshow

If you want something watchable without drawing, type the notes into slides, one idea per slide, and record narration over them, or use a slide tool's built-in recording and export. This sits in the middle: less learning than the teach-back, and more effort than generating, but you control exactly what's on screen.

The usual trap is putting the notes on the slides word for word. A slide full of your shorthand is just your notes, only now they move. Cut each slide to a picture or a short phrase and let the narration carry the explanation.

Option 3: Generate the video from the notes

If what you need is the revision video, a generator can take the notes and produce a finished, narrated explanation. Your job becomes checking that it's right. That's still study time well spent: reviewing an explanation of your own lecture and catching what it got wrong is a decent test of what you know.

How Rekka does it

With Rekka you attach the notes in the chat at rekkaai.com/app and send them. They can be:

A phone photo of handwritten notes, or a few photos of several pages. Legible handwriting works; if a friend would struggle to read it, so will Rekka.
Photos of printed handouts or slides.
A typed file: Word, Pages, OpenDocument, RTF, plain text or PDF.

Rekka reads what's on the pages, including diagrams, tables and equations, and writes the script from them, so the video uses the same terms your lecturer did. It then draws the explanation scene by scene in a whiteboard, chalkboard or crayon style while an AI voice narrates.

With no message, the video covers everything you attached. You can steer it in the same message: "only the part about enzyme kinetics", "explain it like I'm seeing it for the first time", "go slower on the derivation", or a language for the narration.

Before you make a video, you can also ask questions about the notes in the chat. "What's the main idea on page 2?" or "what did I leave out?" Asking costs no credits, and it's a quick check that Rekka read your handwriting the way you wrote it.

The rest:

Up to 30 pages per message.
One credit makes one video of about 100 seconds. New accounts get one free credit. On the free plan, the video is one roughly 100-second chapter that summarises the notes; paid plans can make longer, multi-chapter videos, and you see the length and credit cost and confirm first.
The mp4 appears in the chat. Download it, or turn on a share link to send to your study group. Portrait works well if you'll watch on your phone.

There's more on the notes to video page.

Tips for better notes-to-video results

One topic per video. A video that tries to cover a whole lecture ends up skimming everything.
Photograph pages flat, in good light, one page per photo. Shadows and steep angles are the most common reason handwriting doesn't read cleanly.
Fill obvious gaps before sending. If your notes say "see slide 14" and slide 14 has the key diagram, attach slide 14 too.
Watch it once actively. Pause before each scene and say what you expect comes next. The places you can't predict are the places to review.

Of the three routes, the teach-back is the one that does the most for your understanding, and the generated video is the one you'll actually rewatch before the exam. A good setup uses both: write the explanation yourself for the topics that confuse you, and generate videos for the rest.