.KEY File Format (.key)

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🔀 Multi-Format Extension (.KEY)

Multiple Formats Use the .KEY Extension

The .key extension represents 2 distinct file formats depending on your application or industry. Select a format variant below to jump to its specification:

Format 1 Security and cryptography

Apple Keynote Presentation Document

ZumiFiles Engine: ZipArchive IWA slide preview extractor

View Security and cryptography Specs ↓
Format 2 Security and cryptography

SSL/TLS Private Cryptographic Key

ZumiFiles Engine: PEM / DER Certificate & Cryptographic Key inspector

View Security and cryptography Specs ↓

⚔️ Format Comparison (.KEY Variants)

Property Variant 1: Apple Keynote Presentation DocumentVariant 2: SSL/TLS Private Cryptographic Key
Category Security and cryptographySecurity and cryptography
File Header / Signature UTF-8 source text (import / const / type / interface)UTF-8 source text (import / const / type / interface)
ZumiFiles Engine ZipArchive IWA slide preview extractorPEM / DER Certificate & Cryptographic Key inspector
Browser Support ✓ PREVIEWABLE (High)✓ PREVIEWABLE (Native)
.KEY Container • Multi-Format Extension
PREVIEWABLE

KEY File (.key)

Open and inspect supported .KEY files privately inside your browser. Your files remain 100% local and are never uploaded to any server or cloud API.

Launch .KEY Viewer in ZumiFiles

📋 Detailed Format Specifications

2 Distinct Formats for .KEY
Format 1

Apple Keynote Presentation Document (.key)

Security and cryptography • ✓ PREVIEWABLE

ZumiFiles Engine: ZipArchive IWA slide preview extractor

What is an .KEY File (Apple Keynote Presentation Document)?

Apple Keynote files (.key) are presentation slide decks created by Apple Keynote containing slide layouts, vector shapes, animations, and media.

Associated Software & Origin

Created and edited in Apple Keynote on macOS and iOS, and iCloud Keynote.

Data Structure & Characteristics

Zip container holding Index.zip, IWA (Index WA) Snappy-compressed binary Protobuf stream records, and high-res slide previews.

What ZumiFiles Can Inspect

ZumiFiles extracts embedded slide preview renders and document metadata directly from Keynote archives.

⚡ ZumiFiles Engine Specs for Apple Keynote Presentation Document

✓
Technical Engine: ZipArchive IWA slide preview extractor
✓
Client-Side Security: 100% in-browser sandboxed decoding with zero network server uploads.
✓
Sidecar Metadata: Attach tags, 5-star ratings, custom color tints, and notes via portable .{filename}.json sidecars.
Format 2

SSL/TLS Private Cryptographic Key (.key)

Security and cryptography • ✓ PREVIEWABLE

ZumiFiles Engine: PEM / DER Certificate & Cryptographic Key inspector

What is an .KEY File (SSL/TLS Private Cryptographic Key)?

Cryptographic Private Key files (.key) store public-key cryptography private keys, SSL/TLS certificates, or software activation keys.

Associated Software & Origin

Generated by OpenSSL, SSH tools (ssh-keygen), GPG, and web server software (Nginx, Apache).

Data Structure & Characteristics

Formatted as Base64 PEM containers (`-----BEGIN PRIVATE KEY-----`) or binary DER structures containing RSA, ECC, or Ed25519 key parameters.

What ZumiFiles Can Inspect

ZumiFiles inspects certificate key types, key length (2048/4096-bit), cryptographic algorithms, and PEM block headers locally.

⚡ ZumiFiles Engine Specs for SSL/TLS Private Cryptographic Key

✓
Technical Engine: PEM / DER Certificate & Cryptographic Key inspector
✓
Client-Side Security: 100% in-browser sandboxed decoding with zero network server uploads.
✓
Sidecar Metadata: Attach tags, 5-star ratings, custom color tints, and notes via portable .{filename}.json sidecars.

Related File Formats & Viewers

Inspect other supported formats within the Multi-Format Extension suite:

.PNG

Portable Network Graphics

→
.JPG

JPEG Image

→
.PDF

Portable Document Format

→
.JSON

JSON Data File

→
.TXT

Plain Text Document

→
.CSV

Comma-Separated Values

→

Flexible Ways to View Files in ZumiFiles

ZumiFiles adapts to your exact workflow. Choose how you want to open and inspect your files:

1. Browse Local Directory

Mount entire project folders directly from your computer using the browser's File System Access API. Navigate nested subfolders with dual-pane split screens.

2. Instant Single-File Preview

Drag and drop or select a single file to inspect it instantly in a sandboxed viewport. Perfect for quick checks without mounting whole directories.

3. Load Remote File URL

Paste any public web URL to fetch and render remote documents, 3D models, code files, or spreadsheets directly inside your browser.

Launch .KEY Viewer in ZumiFiles

Explore all 1,750+ formats in the ZumiFiles File Format Matrix.