The short answer
- A KEY file is an Apple iWork presentation document that stores Keynote slides and media, with some playback and conversion results depending on external media, passwords and package handling.
- On a Mac, open the KEY file in the latest Keynote. If Keynote does not let you select the presentation, the current version cannot open it. Password-protected files require their password, which Apple cannot recover if forgotten. Keynote saves a presentation as a single file by default, but it can instead be saved as a package; some websites and email services cannot upload or attach such a package.
- Treat an unfamiliar KEY file as interactive content rather than a purely static document. It may contain links to websites, email addresses or phone numbers whose displayed text differs from the destination, plus online video that contacts YouTube or Vimeo. Inspect link targets before activating them. A recognizable iWork container establishes neither that the document is specifically Keynote nor that its content is trustworthy.
Apple Keynote Presentation (KEY) File
Apple Keynote Presentation is the presentation format used by Keynote in Apple’s iWork suite. PRONOM classifies Keynote ’09 as a presentation format and identifies it through a container signature rather than a confirmed fixed byte header. Newer Keynote, Pages and Numbers documents share an underlying iWork structure, so a generic iWork container alone does not prove that a file is a Keynote presentation.
Keynote for Mac can export a KEY presentation to PPTX, PDF, movie, animated GIF, images, HTML or Keynote ’09; a Keynote ’09 export can only be opened by Keynote 5.0 through 5.3. PDF makes each slide a separate page; image export turns selected slides into images; HTML creates an index.html that retains animations and builds. Static PDF or image copies therefore do not preserve every native presentation behavior. Check whether an exported copy retains, changes or removes the original password.
How to open it
On a Mac, open the KEY file in the latest Keynote. If Keynote does not let you select the presentation, the current version cannot open it. Password-protected files require their password, which Apple cannot recover if forgotten. Keynote saves a presentation as a single file by default, but it can instead be saved as a package; some websites and email services cannot upload or attach such a package.
On a Mac, open the KEY file in the latest Keynote. If Keynote does not let you select the presentation, the current version cannot open it. Password-protected files require their password, which Apple cannot recover if forgotten. Keynote saves a presentation as a single file by default, but it can instead be saved as a package; some websites and email services cannot upload or attach such a package.
Keynote for Mac can export a KEY presentation to PPTX, PDF, movie, animated GIF, images, HTML or Keynote ’09; a Keynote ’09 export can only be opened by Keynote 5.0 through 5.3. PDF makes each slide a separate page; image export turns selected slides into images; HTML creates an index.html that retains animations and builds. Static PDF or image copies therefore do not preserve every native presentation behavior. Check whether an exported copy retains, changes or removes the original password.
File safety
Treat an unfamiliar KEY file as interactive content rather than a purely static document. It may contain links to websites, email addresses or phone numbers whose displayed text differs from the destination, plus online video that contacts YouTube or Vimeo. Inspect link targets before activating them. A recognizable iWork container establishes neither that the document is specifically Keynote nor that its content is trustworthy.
An unknown sender, a name ending in two extensions, or contents that do not match the extension — check before you open it.
Converting it
Keynote for Mac can export a KEY presentation to PPTX, PDF, movie, animated GIF, images, HTML or Keynote ’09; a Keynote ’09 export can only be opened by Keynote 5.0 through 5.3. PDF makes each slide a separate page; image export turns selected slides into images; HTML creates an index.html that retains animations and builds. Static PDF or image copies therefore do not preserve every native presentation behavior. Check whether an exported copy retains, changes or removes the original password.
Convert a copy, never the original, then compare quality, metadata, and layout against what you started with.
Common questions
What is an Apple Keynote KEY file used for?
It is a presentation document used by Keynote in Apple’s iWork suite. It can contain slides, audio, video, autoplay media, online video and active links.
How do I open a KEY file in Apple Keynote?
Open it with the latest Keynote on Mac. If the presentation cannot be selected, Apple says the current Keynote cannot open it; a protected file also requires its password.
How do I open a KEY file on a Mac?
Use the latest Keynote for Mac and select the presentation. Keynote normally saves a presentation as one file; if it was saved as a package, some websites and email services may be unable to upload or attach it, so obtain the original through a service that supports packages. Password-protected presentations require the correct password.
Why is my KEY file not opening in Keynote?
The installed Keynote may not support it, or the presentation may require a password. A presentation saved as a package may also have been sent through a website or email service that cannot upload or attach packages. Update Keynote, confirm the password and obtain the original through a service that supports packages.
What is the difference between a KEY file and a PowerPoint PPTX file?
KEY is Keynote’s presentation format in an iWork container; PRONOM cannot currently distinguish newer Keynote containers from Pages and Numbers by their shared structure alone. PPTX is the PowerPoint format produced by Keynote’s PowerPoint export. Keynote for Mac can open and edit PPTX and PPT files and save them as Keynote or PowerPoint.
How do I convert a KEY presentation to PowerPoint PPTX?
Open it in Keynote for Mac and choose the PowerPoint export format; the resulting file uses .pptx. Review media, interactive behavior and password protection in the exported copy.
Does exporting a Keynote KEY file to PDF preserve its animations?
No, not all of them. Keynote exports each slide as a separate PDF page, so the PDF does not retain all animation or interactive behavior of the native presentation.
Is an emailed KEY file safe to open?
Do not assume so. A KEY presentation can contain active links with destinations different from their visible text and online media that requires network access. Inspect links before activating them.
When should a Keynote presentation be saved as a package, and what limitations follow?
Apple recommends considering package format for presentations over 500 MB or containing large video or image files. Some websites and email services cannot upload or attach such packages.
Does identifying an iWork container prove that a KEY file is valid and trustworthy?
No. PRONOM says newer Keynote, Pages and Numbers documents share an underlying structure that its registry cannot currently distinguish. Container recognition also says nothing about whether the content or links are trustworthy.
Related formats
Sources
PRONOM: Apple iWork Keynote 09 (fmt/646) · 英国国家档案馆 PRONOM 格式登记库
PRONOM: Apple iWork Document 14 (fmt/1441) · 英国国家档案馆 PRONOM 格式登记库
Open or close a Keynote presentation on Mac · Apple 官方 Keynote 用户指南
Save a large Keynote presentation as a package file on Mac · Apple 官方 Keynote 用户指南
Export to PowerPoint or another file format in Keynote on Mac · Apple 官方 Keynote 用户指南
Add video and audio in Keynote on Mac · Apple 官方 Keynote 用户指南
Link to a webpage, email, phone number, or slide in Keynote on Mac · Apple 官方 Keynote 用户指南
Password-protect a Keynote presentation on Mac · Apple 官方 Keynote 用户指南