QT Converter — Convert QuickTime Videos to MP4 Online Free

Convert QuickTime QT and MOV video files to universally compatible MP4 format in your browser. Fast re-mux or full re-encode — powered by FFmpeg WebAssembly, 100% private.

Drag & drop or click to upload

Supports .qt, .mov

Best for: H.264 QT files from iPhones, screen recorders, and Final Cut Pro.

Result

Upload a QT file and hit convert to generate your MP4.

QT → MP4 in Your Browser

QuickTime files work great on Apple devices but often fail to play on Windows, Android, and most online platforms. Convert your QT videos to universally compatible MP4 format instantly — no software to install, no file upload, and complete privacy.

QuickTime → Universal

Key Features

Apple Format Support

Handles both .qt and .mov QuickTime containers, including files from older and newer Apple devices.

Fast Re-mux Option

Re-mux H.264 QT files to MP4 in seconds with zero re-encoding, preserving the original video quality perfectly.

Quality Control

Choose between fast re-mux for zero quality loss or full re-encode for maximum device compatibility.

100% Private

Conversion runs entirely via FFmpeg WebAssembly in your browser. Your video files never touch any server.

Common Use Cases

Screen Recordings

Convert QuickTime screen recordings to MP4 for sharing on Slack, Google Drive, or YouTube

iPhone Videos

Convert older iPhone videos in QT format to MP4 for cross-platform editing and sharing

Video Editing

Prepare QT footage for video editors and platforms that require standard MP4 H.264 input

How this QT Converter works

QuickTime (.qt and .mov) files share the same container structure — an ISOBMFF-derived format Apple developed for its media framework. The converter handles them identically, offering two processing paths based on your needs.

In Fast Re-mux mode, the tool loads FFmpeg WebAssembly, reads the QT container, and copies both the video and audio streams directly into an MP4 container without re-encoding. The -c copy flag instructs FFmpeg to transfer raw packet data unchanged. The -movflags +faststart argument moves the moov atom to the start of the output file, enabling progressive web playback. This path completes in seconds and produces zero quality loss since no codec processing occurs.

In Full Re-encode mode, the video stream is re-encoded using libx264 at CRF 23 and the audio stream is re-encoded to AAC at 192 kbps. This path resolves codec compatibility issues when the QT source contains Apple ProRes, Animation codec, or other formats not widely supported outside the Apple ecosystem. All processing runs locally in your browser via FFmpeg WebAssembly with no server upload required.

How to use this QT Converter

1

Upload QT File

Drag and drop or click to select a QuickTime (.qt or .mov) video file from your device.

2

Choose output format

Select MP4 as the output format and pick between fast re-mux or full re-encode.

3

Convert & download

Click Convert — watch the progress bar and download your MP4 video when complete.

Example Usage

A QuickTime screen recording converted to MP4 using fast re-mux — no quality loss, ready for upload to Google Drive or YouTube.

Input
presentation-recording.qt (148 MB, 00:12:30)
Output
presentation-recording.mp4 (141 MB, H.264/AAC)

Frequently Asked Questions

What is a QT file?
A QT file is a QuickTime video container developed by Apple. It uses the .qt or .mov file extension and can store video, audio, and other media tracks. It is the native format for Apple's QuickTime Player.
Why convert QT to MP4?
MP4 is the most widely supported video format across all devices and platforms. Converting QT to MP4 ensures compatibility with Android devices, Windows PCs, streaming services, and social media platforms that may not support QuickTime natively.
Is there a difference between QT and MOV files?
QT and MOV files are essentially the same format — both use the QuickTime container structure. The .qt extension is less commonly used today; most Apple video files now use the .mov extension. This tool handles both.
Will converting QT to MP4 reduce video quality?
If you choose the "fast" re-mux option and the source video uses H.264 codec, the video stream is not re-encoded, so there is zero quality loss. The "compatible" option re-encodes to ensure playback on all devices, with minimal quality reduction.
Is my video file uploaded to a server?
No. This tool runs entirely in your browser using FFmpeg WebAssembly. Your video file never leaves your device. No accounts, no uploads, and no privacy risks.
What output formats does this tool support?
This tool converts QT files to MP4 (H.264/AAC), which is the most universally compatible output format for video sharing, editing, and playback across all major platforms.
How large a QT file can this tool handle?
The tool processes files entirely in browser memory, so the practical limit depends on the available RAM in your device. Most consumer computers can handle QT files up to 500 MB to 1 GB without issues.
Does this tool work on iPhone and iPad?
Yes. The browser-based tool works on Safari on iPhone and iPad, though conversion speed may be slower on mobile devices compared to desktop computers due to hardware differences.
Can I use this tool to convert other Apple video formats?
This tool is optimized for QT and MOV files. For other Apple formats like M4V, you can check our MOV to MP4 converter, which follows the same process and handles all QuickTime-compatible containers.
Why does the conversion take time to start?
The tool first downloads the FFmpeg WebAssembly engine (about 30 MB) from a CDN. This only happens on first use. Subsequent conversions within the same session will start immediately without re-downloading.

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The QT Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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