Anki Image Occlusion Generator for Images and PDFs
Create Anki image-occlusion cards from an image or PDF. Auto-detect labels, review or draw masks, preview every card, and export a real .apkg free.
Open the full Image Occlusion editor
Multiple PDF pages, full mask editing with undo, card preview, and a real .apkg download. The demo below is a one-page taste of the same engine.
Cover the labels. Then test yourself.
The masks below are real controls. Reveal the answer, remove a bad mask, or draw a missing one before you confirm.
HiddenHiddenHiddenHiddenHiddenHiddenImage occlusion is one of the fastest ways to learn anatomy, histology, pathways, maps, and any labeled diagram: cover one label, recall it, then reveal the answer. The slow part is making the cards. GuruOwl’s free online editor accepts a PNG, JPEG, WebP, or PDF, proposes masks for printed labels, and still lets you draw, move, resize, rename, or delete every box before export.
No account is required. Add an image or choose PDF pages, review and confirm the masks, preview the exact cards, then download a standard .apkg for Anki Desktop, AnkiMobile, AnkiDroid, or AnkiWeb. For a full textbook or lecture pack, the signed-in Expert workflow can also find likely diagram pages across the PDF and generate them in a larger deck.
Start with an image or PDF
Use a PNG, JPEG, WebP, or pick pages from a PDF. The standalone editor is free, needs no account, and does not store the source file.
Auto-detect, then edit every mask
Let the model propose boxes for printed labels, or draw them yourself. Move, resize, rename, delete, undo, and redo until the card tests exactly what you intend.
Preview and export a real .apkg
Confirm each page, preview one card per mask, then download a standard Anki package that opens in Anki Desktop, AnkiMobile, AnkiDroid, or AnkiWeb.
Scale up to a full PDF when needed
The signed-in Expert workflow can scan a chapter or textbook for likely diagram pages, generate occlusion cards, and include them in a larger editable deck.
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Turn your PDF into a deck you’ll actually review
50 free credits on signup — about one full PDF, no card required.