Convert FLV to MOV Online
Convert Flash FLV videos to QuickTime MOV for the Apple ecosystem. Free, no server uploads.
.flv · up to 100 MB
What you can do
Rescue your Flash videos and bring them to Apple
Flash archive preservation
FLVs are unplayable on modern systems without Flash. MOV makes them permanently accessible.
100% private
Your FLV videos never leave your device. Re-encoding happens entirely in local WebAssembly.
Sorenson/VP6/H.264 → H.264
All three Flash codecs are transcoded to the universal H.264 standard compatible with the Apple ecosystem.
No Flash Player needed
Convert once and play on any modern Mac without reinstalling Adobe Flash or obsolete components.
How it works
Three steps, no hassle
Upload your FLV file
Drag or select the .flv — videos downloaded from YouTube before 2020, Flash Player clips, Sorenson Squeeze recordings, or VP6 files. No signup.
H.264 re-encoding in the browser
The Sorenson Spark, VP6, or H.264 video inside the FLV container is decoded and re-encoded to H.264 inside the QuickTime MOV container on your device via WebAssembly.
Download your MOV
A .mov file ready to import into Final Cut Pro, iMovie, or QuickTime Player without installing additional Flash components.
FAQ
Got questions?
Adobe Flash Player was officially discontinued on December 31, 2020. Chrome, Firefox, Safari, and Edge removed native Flash support that same month. FLV files are Flash's native video container and depend on the Flash Player engine to play. Without that engine, FLV files are opaque to modern browsers and operating systems. Converting to MOV or MP4 is the only way to preserve that content as playable on current systems.
An FLV file can contain three main video codecs depending on when it was created: Sorenson Spark (also called FLV1, an H.263 derivative used by Flash since version 6 in 2002), VP6 (developed by On2 Technologies and adopted by Adobe Flash in version 8 in 2005 for better quality), and H.264 (added in Flash Player 9 Update 3 in 2007, the same standard H.264 used by MP4 and MOV). Older FLVs contain Sorenson Spark or VP6; those created after 2007 typically contain H.264.
If the FLV contains H.264, the video can be remuxed without re-encoding (no additional quality loss). If it contains Sorenson Spark or VP6, re-encoding to H.264 is required, which involves an additional compression generation. Quality loss in that re-encoding is minimal if a similar or higher bitrate than the original is used. The result is always playable in the Apple ecosystem without depending on Flash.
No. Final Cut Pro and iMovie don't include native support for the FLV container or for the Sorenson Spark or VP6 codecs. Final Cut Pro's importable formats include ProRes, H.264/H.265 in MOV or MP4, AVCHD, and professional camera formats, but never FLV. Converting to MOV is the mandatory step to edit Flash videos in Apple applications.
Yes. FLVs can contain audio in MP3 or AAC format. During conversion, MP3 audio is transcoded to AAC (Advanced Audio Coding) for maximum compatibility with the Apple ecosystem, or kept in AAC if already in that format. The sync between video and audio is preserved in the resulting MOV file.
YouTube used FLV as its main video format from its founding in 2005 until approximately 2010, when the gradual migration to H.264 in MP4 began. Flash Player was the dominant browser plugin at the time (with market shares above 95%), making FLV the de facto format for web video. Videos downloaded from YouTube between 2005 and 2010 with tools like KeepVid or Zamzar are almost always in FLV.
Convert FLV to MOV: preserve Flash video in the Apple ecosystem
The FLV (Flash Video) format was created by Macromedia in 2002 as the native video container of Flash Player 6. When Adobe acquired Macromedia in 2005, it inherited FLV along with the entire Flash platform and turned it into the de facto standard for web video during the first decade of the 21st century. YouTube, Vimeo, Dailymotion, and virtually all video portals used FLV as their primary distribution format between 2005 and 2010. The reason was simple: Flash Player 6 and later versions were installed in over 95% of desktop browsers at that time, thanks to their mass distribution as a free plugin for Internet Explorer, Firefox, and Netscape. The FLV container supported three generations of video codecs: Sorenson Spark (H.263 derivative, Flash 6, 2002), VP6 from On2 Technologies (Flash 8, 2005), and finally standard H.264 (Flash Player 9 Update 3, 2007). With Adobe Flash Player's official end on December 31, 2020, and its removal from all modern browsers, FLV files became orphaned: they are unplayable on modern systems without specialized conversion tools.
MOV (QuickTime Movie) is Apple's native video container, developed in 1991 for QuickTime 1.0 on Mac System 7. It is the preferred format for Apple's video editing tools: Final Cut Pro, iMovie, Motion, and QuickTime Player itself. Converting FLV to MOV has two main applications. The first is archive preservation: millions of videos created between 2002 and 2015 exist only in FLV format — educational recordings, news clips, corporate videos, entertainment content, and independent productions that only circulated on Flash platforms. With Flash definitively dead, converting those FLVs to MOV is the only way to guarantee their long-term playability in the Apple ecosystem. The second application is content production: creators and editors who need to reuse clips from the Flash era in current Final Cut Pro or iMovie projects need to convert FLVs to a format those applications can natively import.
The technical process of converting FLV to MOV depends on the video codec contained in the FLV. If the FLV contains H.264 (most common in post-2007 files), the most efficient process is direct remuxing: the H.264 video stream is extracted from the FLV container and re-encapsulated in the MOV container without re-encoding, preserving the exact quality of the original without additional compression generations. If the FLV contains Sorenson Spark (modified H.263) or VP6 (the On2 Technologies codec adopted in Flash 8), full re-encoding is required: the video is decoded to YUV frames and re-encoded with the H.264 encoder (MPEG-4 AVC, ISO/IEC 14496-10). FLV audio, generally in MP3 or AAC, is transcoded to AAC for maximum compatibility with the Apple ecosystem. Convertir.ai performs this entire process in WebAssembly inside the browser, without transmitting video data to any external server — guaranteeing total privacy for personal or corporate files that may contain sensitive content.