Convert QT to MP4 — Free Online Converter
Convert QuickTime (.qt) to MPEG-4 Part 14 (.mp4) online for free. Fast, secure video conversion with no watermarks or registration....
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Upload your .mov file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .mp4 file when it's ready.
About MOV to MP4 Conversion
The MP4 format (MPEG-4 Part 14, ISO 14496-14) was directly derived from Apple's QuickTime container specification — making this conversion a homecoming of sorts. While QT and MP4 share the atom/box architecture, MP4 standardized specific codecs (H.264, H.265, AAC) and metadata structures for universal compatibility. Converting QT to MP4 transforms Apple's proprietary container into the world's most widely supported video format, playable on virtually every device, browser, and platform.
Why Convert MOV to MP4?
QT files are limited to Apple software, and QuickTime for Windows was deprecated in 2016 with known security vulnerabilities. MP4 is universally supported — every web browser, smartphone, smart TV, streaming platform, and social media site accepts MP4. This single conversion eliminates all compatibility barriers while preserving quality.
Common Use Cases
- Publishing QT video content on YouTube, Instagram, TikTok, and other social platforms
- Sharing QT project outputs with clients who use Windows or Android
- Preparing QT files for HTML5 video embedding on websites
- Uploading QT content to cloud storage services for universal access
- Converting QT archives for long-term preservation in a standardized format
- Enabling QT video playback in web browsers without plugins
How It Works
FFmpeg re-encodes video to H.264 High Profile (or copies the stream if already H.264-compatible) and audio to AAC-LC. The MP4 container is written with 'ftyp isom' branding for maximum compatibility, moov atom placed at the file start (faststart), and proper sync sample table for accurate seeking. Typical output uses CRF 22 with the 'slow' preset for optimal quality-to-size ratio.
Quality & Performance
When the QT source contains H.264 video and AAC audio, stream copying produces identical quality instantly. When re-encoding from ProRes or other high-quality QT codecs, CRF 22 produces visually transparent results — even professional colorists struggle to distinguish the output from the source in blind tests.
Device Compatibility
| Device | MOV | MP4 |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No | Native |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use CRF 18-22 for high-quality output (smaller number = higher quality, larger file). CRF 22 is the sweet spot for most content.
- 2Enable the 'slow' encoding preset for the best compression efficiency — it produces 10-15% smaller files than 'medium' at the same quality.
- 3Always enable faststart (moov atom relocation) for web and streaming use — without it, the entire file must download before playback begins.
- 4For 4K QT files, use H.265 instead of H.264 to get reasonable file sizes — 4K H.264 files can be enormous.
- 5Check if your QT file uses H.264 before converting — if it does, remuxing is instant and lossless, no need for re-encoding.
Related Conversions
QT to MP4 is the single most impactful conversion for QuickTime content owners. It transforms Apple-only files into universally playable content with minimal to zero quality loss. For any QT file destined for sharing, streaming, or web use, MP4 is the definitive target format.