How to Open a .key File (Keynote) on Windows
A .key file is a Keynote presentation. PowerPoint cannot open it, and converting costs you exactly the thing Keynote is usually chosen for: the transitions.
.key
Why it will not open
- PowerPoint has no importer. Keynote's format is Apple's own and closed, so there is no local conversion path.
- A .key can be very large. Keynote embeds fonts and full-resolution media, so decks routinely reach hundreds of megabytes — awkward for any converter that expects an upload.
- The extension collides. Several licensing systems also use .key for key files, so a small .key that is plain text is probably not a presentation at all.
How to open it
Convert through iCloud
- 1 Sign in at iCloud.com with a free Apple ID and open Keynote.
- 2 Drag the .key into the list, open it, then choose Download a Copy > PowerPoint or PDF.
- 3 For a deck you only need to read, PDF is the better choice — it preserves the layout exactly and produces a far smaller file.
Ask the sender
- 1 In Keynote: File > Export To > PowerPoint, or PDF.
- 2 Worth mentioning to them that Magic Move and most Keynote-specific builds do not survive the export, so they may prefer to send a PDF or a recorded video instead.
A small .key is probably not Keynote
Keynote presentations are megabytes at minimum. A .key of a few kilobytes containing readable text is almost certainly a software licence file. The identifier on this site will tell you which you have.
What the conversion loses
Magic Move transitions, Keynote-only build effects, and some font substitutions. Static content and basic transitions come across. If the animation carried meaning, ask for a video export instead.