🎬 Video Converter

Rescue Legacy FLV Flash Video for Modern Devices and Platforms

FLV (Flash Video) was the standard web video format from 2005 to 2015 — YouTube, Vimeo, Dailymotion, and every major streaming platform delivered video in FLV during this era. Flash is dead, and FLV files from that period are now unplayable on modern devices without conversion. FLV-to-MP4 rescues your Flash-era video archive for upload to YouTube, playback on iPhone and Android, editing in modern video tools, and long-term storage.

⚡ Convert FLV to MP4 Now Browse All Tools

✓ Free forever ✓ No upload ✓ No signup ✓ FFmpeg-powered

🎬

Ready to rescue your Flash video archive?

FFmpeg.wasm runs in your browser · Video stays on your device · Instant download

Start Converting →

How to Convert FLV to MP4

Open the Converter

Click "Convert Now" — opens on the Video tab with FLV → MP4 pre-selected.

Upload Your FLV

Drag and drop your .flv file or click Browse. YouTube downloads, old tutorials, and corporate training videos all work.

Browser Converts

FFmpeg.wasm processes the video entirely in your browser — no server, no wait queue, no upload.

Download MP4

Your MP4 file downloads automatically, ready to play on any device or upload to YouTube.

Rescue Your Flash Video Archive: FLV to MP4 Conversion

The death of Adobe Flash on December 31, 2020 left behind an enormous archive of FLV video files — early YouTube downloads, archived streaming content, Flash-era tutorials and webinars, corporate training videos recorded before MP4 became standard. These files are functionally unplayable on any modern device: iPhones don't support FLV, Android's default player doesn't support it, modern Windows has no FLV codec installed, and macOS has never supported FLV natively. Converting FLV to MP4 rescues this content. MP4 with H.264 video is the universal standard accepted by every platform, device, and application. YouTube accepts MP4 for re-upload. iPhone and Android play MP4 natively. Final Cut Pro, Premiere, DaVinci Resolve, and iMovie all import MP4 without issues. The conversion is typically lossless for FLV files that already use H.264 video — the video stream is repackaged into an MP4 container without re-encoding, preserving full quality instantly.

When You Need FLV to MP4

📤 Re-upload archived FLV tutorial or training videos to YouTube as MP4 for modern hosting
📱 Play FLV files from old YouTube/Dailymotion downloads on iPhone or Android via MP4
✂️ Import FLV video archives into Final Cut Pro, DaVinci Resolve, or Premiere as MP4
🎓 Convert corporate FLV training videos from the Flash era to MP4 for LMS migration
💾 Archive FLV video collections in the future-proof, universally supported MP4 format

Features

⚡

FFmpeg.wasm

Industry-standard FFmpeg compiled to WebAssembly — runs entirely in your browser.

🔒

100% Private

Your video archive never leaves your device. No upload, no cloud processing.

🎯

Near-Lossless

H.264 FLV files are container-swapped to MP4 without re-encoding — no quality loss.

📦

Batch Convert

Select multiple FLV files at once — each produces a separate MP4 output.

🆓

Free

No account, no fee, no watermarks. Unlimited conversions.

📱

Works on Mobile

Convert on any device — no desktop app needed.

Frequently Asked Questions

For FLV files using H.264 video (the most common FLV codec for content from 2008 onward), the conversion is a container swap — the video stream is moved from the FLV container to MP4 without re-encoding, meaning no quality loss. FLV files with older Sorenson Spark or On2 VP6 video require re-encoding to H.264.

Flash Player was permanently discontinued in December 2020. All major browsers removed Flash support. FLV is Adobe Flash's native video container, and without Flash Player, there's no default way to play FLV on modern systems — though VLC can still open FLV files.

Select all your FLV files at once in this converter — each produces a separate MP4 output. They're processed sequentially in the browser.

Yes. FLV audio (MP3 or AAC) is preserved in the MP4 output. AAC audio in FLV is repackaged without re-encoding; MP3 audio may be transcoded to AAC for maximum MP4 compatibility.

FLV files from the YouTube era (2005–2012) were typically encoded at low resolutions (360p, 480p) with aggressive compression. Converting to MP4 doesn't improve the original quality — the resolution and bitrate of the source FLV is preserved. The MP4 is playable everywhere but remains the original quality.

Yes. The MP4 output imports into all major video editors: Final Cut Pro X, DaVinci Resolve, Adobe Premiere, iMovie, and Windows Movie Maker. FLV itself is not natively supported by most modern editors.

No. All conversion happens locally in your browser. Your video archive — which may contain proprietary content, personal recordings, or licensed media — never leaves your device.