Video to FLV Converter - Flash Video Format

Convert videos to FLV format for legacy Flash players and streaming servers. Browser-based conversion, no uploads, completely private.

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MP4, WebM, AVI, MKV, MOV, and more

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All processing happens in your browser using FFmpeg WebAssembly. Your videos never leave your device—completely private and secure.

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Frequently Asked Questions

FLV (Flash Video) was the dominant web video format in the 2000s-2010s, used by YouTube, Vimeo, and most video sites before HTML5. Flash Player is discontinued (Dec 2020), but FLV is still used in legacy streaming servers like Wowza, Adobe Media Server, and RTMP infrastructure.

FLV is only needed for: legacy streaming infrastructure that can't be upgraded, RTMP servers requiring FLV input, archival purposes to match existing video libraries, and maintaining compatibility with proprietary media servers. For all new projects, use MP4 instead.

No. Modern browsers cannot play FLV since Flash Player was discontinued. To watch FLV files, you need desktop players like VLC or MPV, or you must convert FLV to MP4/WebM for web playback. Chrome, Firefox, Safari, and Edge all removed Flash support.

RTMP (Real-Time Messaging Protocol) uses FLV as its container format. Many streaming servers still accept RTMP input because upgrading infrastructure is expensive. However, output is usually transcoded to HLS or DASH for delivery to viewers, since browsers don't support FLV.

For streaming use, 'Smaller File' (lower bitrate) works well because FLV's use case is bandwidth-constrained. Choose 'High Quality' only when preserving detail matters. 'Smallest File' is ideal for archiving or when file size is critical.

Always use MP4 for new projects. MP4 has universal browser support, better compression, hardware acceleration on all devices, and works everywhere (phones, TVs, browsers). Only use FLV when you absolutely must maintain compatibility with legacy streaming infrastructure.

This tool uses FLV1 (Sorenson Spark) video codec with MP3 audio, which provides maximum compatibility with legacy FLV players and streaming servers. Modern FLV can contain H.264, but FLV1 ensures broader device support.

Browser-based conversion is slower than native software—expect 5-10x the video's duration. A 1-minute video might take 5-10 minutes. Speed depends on your device (faster on desktop, slower on phones). For batch conversions or large files, use desktop tools like FFmpeg or HandBrake.

No. All processing happens in your browser using FFmpeg WebAssembly. Your video files never leave your device, making this completely private. You can use this tool offline after the page loads.

Keep 'Original' if your source resolution is already low. For web streaming, 480p is typical for FLV. Choose 360p for very low-bandwidth scenarios. FLV was designed for the era of dial-up and early broadband, so high resolutions aren't common.

Video to FLV Converter - Flash Video Format

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