One idea, done well
A Short doesn’t try to cover the whole chapter. It picks the thread you most need and makes it stick.
PDF to video
Your notes, as a Short you’ll actually watch.
Cramby turns any PDF or lecture into a 60-second vertical video: a punchy voice-over, big captions that follow every word, and a background you can’t stop watching.
Drop a PDF to preview yours
Lecture slides, a reading, your notes. It stays on your device; nothing is uploaded.
From PDF to Short in about a minute
Drop in your material
A PDF, slides, a lecture recording or a YouTube link. Cramby turns it into a lesson first.
A script that hooks
One hook, three to five ideas, one line to remember, written only from your material.
Voiced and captioned
Pick a narrator and a background. Captions follow the voice word by word, with key terms highlighted.
Backgrounds drawn live. No borrowed footage.
Every loop is drawn in code, frame by frame, so every Short you save is yours to post. Nothing gets muted or taken down.
Marble ring
Bouncing marbles try to escape
Kinetic sand
Slice after satisfying slice
Prism tunnel
Hypnotic turning geometry
Peg board
Beads build a bell curve
Built to rewatch
Sixty seconds is short enough to replay on the bus, in the queue or right before the exam starts.
Made to share
Save it as a video and send it to your study group, or post it. Every frame is ours to give you.
A Short is the hook, not the whole lesson.
Watch the Short, then let Cramby check it stuck: a quick quiz on the same lesson, flashcards scheduled right before you’d forget, and a tutor that has read your notes.
Questions
- What’s the background footage?
- There isn’t any footage. Every background (marbles in a ring, kinetic sand, a prism tunnel, a peg board building a bell curve) is drawn live in code, so it’s yours to post anywhere and nothing gets taken down.
- Is the script accurate?
- It’s written only from your lesson, the same material your notes, quizzes and flashcards come from. You can read the full script next to the video, and make a new Short with a different focus any time.
- What format is the video?
- A 9:16 vertical video at 720×1280, saved as MP4 in Safari and Chrome (WebM in Firefox), ready for TikTok, Reels, Shorts or a group chat.
- Is it free?
- The preview on this page is free and runs on your device. Narrated Shorts are part of Cramby Scholar, alongside podcasts and smarter AI. Cramby Free still gives you notes, quizzes and flashcards.
Start cramming smarter tonight.
Your next lecture is the perfect first lesson.
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