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Convert FLV to MP4

Extract audio, compress video, and change codecs natively without uploading. Convert FLV to MP4 instantly.

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How to convert FLV to MP4 for free

  1. 1
    Drop your FLV file
    Drag it onto the converter above, or click Browse Files to select it from your computer.
  2. 2
    Click Convert
    MP4 is auto-selected. Hit Convert - FFmpeg.wasm processes everything locally in your browser.
  3. 3
    Download your file
    Your converted MP4 file downloads instantly. Nothing was uploaded to a server.
Source Format

What is FLV?

Flash Video (.flv) - FLV was the standard for web video during the Flash era. Since Flash was discontinued in 2020, FLV files are rarely created but many archives still contain them.

Common use: Playing back archived Flash-era content

Output Format

What is MP4?

MPEG-4 Part 14 (.mp4) - MP4 is the most widely supported video format. It works on virtually every device, browser, and platform. It typically uses H.264 or H.265 codecs for compression.

Common use: Sharing videos online, social media, streaming, and general playback

Frequently Asked Questions

Is converting FLV to MP4 free?+
Yes! You can convert FLV to MP4 for free right in your browser using Filoshi's online converter. No signup or software download needed. For batch conversion of multiple files, the Filoshi desktop app is available for a one-time $14.90 payment.
Does converting FLV to MP4 lose quality?+
It depends on the formats involved. If both FLV and MP4 use lossless compression, no quality is lost. If the conversion involves a lossy format, some quality reduction may occur, but Filoshi uses optimized settings to keep quality loss minimal. The conversion runs entirely on your machine, so there are no server-side compression artifacts.
Can I convert FLV to MP4 without uploading my file?+
Absolutely. Filoshi processes everything locally on your computer. Your FLV files are never uploaded to any server. Even the free browser converter runs entirely in your browser using WebAssembly, with no server involved.
How long does it take to convert FLV to MP4?+
Most conversions complete in seconds. Larger files (like high-resolution video) may take a bit longer depending on your computer's hardware. Since Filoshi runs locally, there is no upload or download wait time, which is significantly faster than online converters.
Can I batch convert multiple FLV files to MP4?+
Yes, the Filoshi desktop app supports batch conversion. You can drop an entire folder of FLV files, select MP4 as the output format, and convert them all at once. Each file gets its own progress bar.

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Need batch FLV to MP4 conversion?
The web converter handles 1 file at a time. Filoshi desktop converts unlimited files, runs offline, and supports 3,000+ formats.
Get Filoshi Desktop - $14.90