FLV Converter Free & Private
Legacy Flash video format. Convert Flash Video files entirely in your browser — no upload, no account.
About Flash Video
FLV (Flash Video) was the dominant web video format during the Flash era (2005–2015). It powered YouTube, Vimeo, and countless streaming sites before HTML5 video replaced Flash. While Flash Player is now end-of-life, FLV files are still encountered in older archives and some live-streaming workflows that use RTMP (which wraps FLV internally).
Technical details
| Container | Flash Video (.flv) |
| Video codecs | H.264, VP6, Sorenson Spark |
| Audio codecs | AAC, MP3, Speex, ADPCM |
| Max resolution | Limited by codec (typically 1080p) |
| Streaming | RTMP, progressive download |
| Metadata | Basic (duration, dimensions, framerate) |
Best for
Converting legacy Flash archives to modern formats
Advantages
- Small file sizes for web delivery
- Used internally by RTMP streaming
- Simple container structure
Limitations
- Flash Player is discontinued — no native browser support
- Limited codec support compared to MP4/MKV
- No subtitle track support
- Obsolete for new projects
Convert other formats to FLV
FLV compatibility
VLC, ffmpeg; no native browser or mobile support since Flash EOL
Why privacy matters for file conversion
Most online converters upload your files to remote servers where they may be scanned, stored, or shared. This tool is different — the conversion runs in your browser via WebAssembly or the WebCodecs API. Your files stay on your device. Always.
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Frequently asked questions
VLC media player can play FLV files on any platform. For a permanent solution, convert FLV to MP4 — this tool does it for free in your browser.
FLV itself is obsolete, but the RTMP streaming protocol (used by OBS, Twitch, and many CDNs) wraps video in FLV internally. For file storage, MP4 has completely replaced FLV.
Yes, completely free with no file limits. The conversion engine runs directly in your browser — we have zero server costs for processing, so we can offer it at no charge.
Your file never leaves your device. The conversion engine runs 100% in your browser using WebAssembly or the WebCodecs API. We have no access to your files — no uploads, no logs, no data collection whatsoever.
On desktop browsers (Chrome, Firefox, Edge) files up to 500 MB convert reliably. On Safari (macOS) the practical limit is around 200 MB. On iPhone and iPad, keep files under 50 MB — iOS enforces tight memory limits for browser-based processing.
On your first visit, the browser downloads the conversion engine (24–50 MB depending on which backend is used). This is cached locally, so subsequent conversions load much faster.
Chrome, Edge, and Brave use hardware-accelerated WebCodecs when the format is supported — this is 5–10× faster than software encoding. For unsupported formats the tool falls back to ffmpeg.wasm, where Firefox typically performs best.
Utterly is a privacy-first transcription app for Apple devices. It uses on-device AI to transcribe and translate audio — no cloud, no subscription required to start. This free converter is brought to you by the Utterly team.