COLPKG Viewer — open .colpkg files online, no Anki needed

What is a .colpkg file?

A .colpkg file is the collection-backup format created by Anki Desktop (File → Export → Collection). It packages your entire collection — every deck, note, card and media file — into a single file, also a zip archive with a SQLite database inside.

Why open .colpkg in your browser?

• No Anki software to install
• Works on any device with a modern browser
• No account, no registration
• Files are parsed locally — never uploaded
• Progress saved locally (IndexedDB)

What can the COLPKG viewer do?

• Browse and review every deck inside the collection
• Render images, audio and cloze deletions
• Review with a full SM-2 spaced-repetition scheduler
• Track progress locally, per deck

Is .colpkg the same as .apkg?

No. An .apkg is a single shared deck; a .colpkg is a backup of an entire collection. Both open in Anki Browser — see the APKG viewer.

FAQ

Is my .colpkg file uploaded to a server?

No. The file is opened and parsed entirely on your device using WebAssembly. Nothing is ever sent over the network.

Do I need to install Anki to use this viewer?

No. Everything runs in your web browser — no installation required.

Does it work on my phone or tablet?

Yes — any modern browser on Windows, macOS, Linux, iOS or Android.

Can I actually study the deck, not just view it?

Yes. Anki Browser includes the classic SM-2 scheduler with Again / Hard / Good / Easy buttons, exactly like Anki.

Does it support images, audio and cloze deletions?

Yes. Media files stored in the deck render inline, and cloze notes are supported.