How do I play an FLV file?

VLC, MPV and PotPlayer play nearly every FLV file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 tag, but niche FLV variants may fail. If a device refuses your FLV, convert to MP4 with our FLV to MP4 converter for universal playback.

How do I reproduzir an FLV file?

VLC, MPV e PotPlayer reproduzir nearly every FLV arquivo on desktop. Browser support varies: moderno Chromium, Firefox e Safari reproduzir common containers via the HTML5 tag, mas niche FLV variants may fail. If a device refuses your FLV, converter to MP4 com our FLV to MP4 converter para universal playback.

FLV vs MOV — Differences, File Size & When to Use Each

FLV vs MOV

A detailed comparison of Flash Video and QuickTime Movie — file size, quality, compatibility, and which format to choose for your workflow.

Convert FLV → MOV Convert MOV → FLV

FLV

Flash Video

Video Files

FLV was the dominant web video format during the Flash era. While Flash is now deprecated, many legacy video files still exist in FLV format and need conversion to modern formats.

About FLV files

MOV

QuickTime Movie

Video Files

MOV is Apple's QuickTime container format, widely used in video production on macOS and iOS. It supports high-quality codecs like ProRes and is the default recording format for iPhones and professional cameras.

About MOV files

Strengths Comparison

FLV Strengths

Low overhead — the container is extremely compact.
Designed for streaming — progressive download and seeking work well.
Decoded natively by Flash Player on every OS for 20 years.

MOV Strengths

Professional-grade container — supports ProRes, DNxHD, and every pro codec.
Multi-track friendly — video, audio, subtitles, chapters, markers all coexist.
Native in every major NLE (Final Cut, Premiere, Resolve, Avid).
Low overhead — the ISOBMFF structure is efficient.
Timecode, alpha channels, and HDR metadata are first-class citizens.

Limitations

FLV Limitations

Flash Player is dead — no modern browser can play FLV without conversion.
Legacy codecs (Sorenson, VP6) are poorly supported in modern tooling.
Hardware video decoders never added FLV support.
Metadata format is primitive compared to MP4 or MKV.
Actively harmful to use today — every major security agency has warned against Flash since 2015.

MOV Limitations

Windows and Linux need QuickTime or FFmpeg-based players to read all features.
ProRes-encoded MOVs are gigantic — 4K clips run 400-900 MB/minute.
Metadata format diverges slightly from MP4, which causes interop bugs.
Older QuickTime codecs (like Animation or DV) are considered legacy.

Technical Specifications

Specification	FLV	MOV
MIME type	video/x-flv	video/quicktime
Extensions	.flv, .f4v	.mov, .qt
Video codecs	Sorenson Spark, VP6, H.264 (F4V)	—
Audio codecs	MP3, Nellymoser, AAC	—
Status	Deprecated since December 31, 2020	—
Container	—	QuickTime File Format (ISO Base Media File Format)
Common codecs	—	ProRes, H.264, HEVC, DNxHD, Animation
Max file size	—	2^64 bytes

Typical File Sizes

FLV

10-min YouTube 2008-era video 40-80 MB
45-min TV show (FLV H.264) 200-500 MB

MOV

iPhone 4K clip (HEVC, 1 min) 170-300 MB
4K ProRes 422 (1 min) 400-600 MB
1080p ProRes 4444 (1 min) 800 MB - 1.5 GB

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Convert between FLV and MOV online, free, and without installing anything. Encrypted upload, automatic deletion after 60 minutes.

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Frequently Asked Questions

FLV (Flash Video) is a video container format that bundles one or more video streams, audio tracks, and optional subtitles into a single file. The container format determines how metadata is organised and which codecs can live inside; the visual quality itself depends on the codec (H.264, H.265, VP9, AV1) rather than the FLV wrapper. It is part of the video files family.

FLV (Flash Video) is a video container formato that bundles one ou more video streams, audio tracks, e optional subtitles em a single file. The container formato determines how metadata is organised e which codecs can live inside; the visual quality itself depende de the codec (H.264, H.265, VP9, AV1) em vez de the FLV wrapper. It is part of the video arquivos family.

VLC, MPV and PotPlayer play nearly every FLV file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 <video> tag, but niche FLV variants may fail. If a device refuses your FLV, convert to MP4 with our FLV to MP4 converter for universal playback.

VLC, MPV e PotPlayer reproduzir nearly every FLV arquivo on desktop. Browser support varies: moderno Chromium, Firefox e Safari reproduzir common containers via the HTML5 <video> tag, mas niche FLV variants may fail. If a device refuses your FLV, converter to MP4 com our FLV to MP4 converter para universal playback.

Upload your FLV to KaijuConverter and pick MP4, MOV, MKV, WebM, or any other target. Our pipeline uses FFmpeg under the hood and stream-copies when codecs are compatible (no quality loss) or transcodes at high-quality defaults otherwise. Conversion runs server-side; both files delete within two hours.

Only when the target requires re-encoding. If the codecs inside FLV match what the target container supports, FFmpeg stream-copies the streams and the output is bit-identical to the source. Transcoding uses transparent quality defaults (CRF 20–23 H.264) and produces output indistinguishable from the original at normal viewing distance.