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Convert QuickTime MOV files to FLV for Flash-based video platforms and legacy streaming systems. ChangeThisFile uses FFmpeg on secure servers to deliver fast, high-quality conversion with no software required.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts QuickTime to FLV using FFmpeg, a professional-grade multimedia framework, to transcode QuickTime files to FLV format with optimized codec settings and quality preservation. Free with no signup required. Files are encrypted during transfer and automatically deleted from our servers after conversion.
QuickTime vs FLV: Format Comparison
Key differences between the two formats
| Feature | MOV (QuickTime) | FLV |
|---|---|---|
| Full Name | QuickTime Movie | Flash Video |
| Developer | Apple | Adobe Systems |
| Container | QuickTime Container | Flash Video Container |
| Video Codec | H.264, H.265, ProRes | H.263, VP6, H.264 |
| Audio Codec | AAC, PCM, MP3 | MP3, AAC, Nellymoser |
| Platform | Apple ecosystem (Mac, iOS) | Flash Player / legacy web |
| Editing | Native in iMovie, Final Cut | Limited modern support |
| File Size | Larger (high quality) | Compact for streaming |
When to Convert
Common scenarios where this conversion is useful
Feeding a system that still requires FLV
If an older CMS, LMS, or RTMP server only accepts FLV uploads, convert your QuickTime file to satisfy that requirement. For anything modern, MP4 is the better target.
Matching an existing Flash-era archive
When a video library is already stored as FLV from the Flash era, convert new QuickTime files to FLV so the collection stays in one format. New archives should use MP4.
Older offline or embedded players
Some legacy desktop, kiosk, or embedded players were built around FLV and cannot read modern formats. Convert QuickTime to FLV only when you cannot update the player itself.
Who Uses This Conversion
Tailored guidance for different workflows
Content Creators
- Convert QuickTime footage to FLV for playback in software and devices that expect the FLV format
- Transform QuickTime recordings to FLV to match the format an existing workflow or player requires
Video Editors
- Convert QuickTime footage to FLV for importing into editing software like Premiere or DaVinci Resolve
- Transform QuickTime project exports to FLV for client delivery or final distribution
Social Media Managers
- Convert QuickTime videos to FLV for compatibility with legacy players or archival systems that use FLV
- Transform QuickTime source files to FLV when a specific tool only accepts FLV input
How to Convert QuickTime to FLV
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1
Upload Your MOV File
Click to select or drag and drop your QuickTime MOV video. The file is transmitted to our servers using encrypted HTTPS for privacy and security.
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2
FFmpeg Converts MOV to FLV
Our server-side FFmpeg process encodes the MOV video to an FLV container with H.264 video and AAC audio for maximum compatibility with Flash-based players.
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3
Download Your FLV
Download the converted FLV as soon as processing is done. Your original MOV file is permanently deleted from our servers right after.
Developers: convert via API →
Frequently Asked Questions
FLV (Flash Video) is needed for legacy Flash-based platforms, older video players, and RTMP streaming workflows. While Flash is deprecated, many archival and enterprise systems still use FLV.
FLV with H.264 encoding delivers good quality, though MOV files (especially ProRes) are often higher quality. Expect some quality reduction due to the compression change.
MOV and MP4 share similar codec support but use different container structures. MOV is Apple's proprietary container and is optimized for the Apple ecosystem.
VLC Media Player, Windows Media Player with codecs, and many other modern players support FLV playback without requiring Adobe Flash Player.
Yes. FFmpeg transcodes both the video and audio streams. The audio is re-encoded as AAC in the FLV container.
Files up to 25MB (free tier; 100MB with eligible paid browser access) are supported. For larger MOV files, compress or trim the video first before uploading to ChangeThisFile.
Yes, your uploaded MOV and the resulting FLV are both automatically removed from our servers after you download the converted file.
Yes. MOV files from Final Cut Pro, iMovie, or any QuickTime-compatible export are supported. Make sure the file is within the 50MB size limit.
Yes, FFmpeg preserves the source frame rate during conversion unless the source rate exceeds FLV container limits.
Yes. ChangeThisFile is completely free, with no accounts, subscriptions, or hidden fees.
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Need to convert programmatically?
Use the ChangeThisFile API to convert QuickTime to FLV in your app or script. Free tier included.
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