Convert MP4 to FLV
Free online MP4 to FLV converter — no signup, no watermark
Convert MP4 (MPEG-4 Part 14) files to FLV (Flash Video) format online for free. Our MP4 to FLV converter runs entirely in your browser — just drag in your file, click convert, and download the result. No software to install, no account required, and your files stay private.
How to convert MP4 to FLV in 4 steps
- 1
Upload your MP4 file
Drag and drop your MP4 file into the converter, or click to browse from your device. We support files up to 2GB.
- 2
Choose FLV as the output format
FLV is pre-selected. Optionally adjust quality, resolution or bitrate if your file needs custom settings.
- 3
Convert MP4 to FLV
Click the convert button. Our converter processes your MP4 file and produces a high-quality FLV output, usually in under a minute.
- 4
Download your FLV file
Once conversion is complete, download your FLV file. Your original MP4 stays untouched and we delete uploaded files within an hour.
Why convert MP4 to FLV?
MP4 is the most widely supported video container format, offering excellent compression with H.264 or H.265 codecs while preserving quality. It works on virtually every device, browser, and platform. FLV was the dominant format for web video during the Adobe Flash era. While Flash is deprecated, FLV files still exist in many legacy systems and require conversion to modern formats for playback. Converting from MP4 to FLV is useful when you need converting legacy flash content or want to take advantage of small file sizes.
Top reasons to switch to FLV
- Converting legacy Flash content
- Recovering old web archives
- Maintaining older streaming systems
MP4 vs FLV: side-by-side
MP4
Pros
- + Universal device and browser support
- + Excellent compression-to-quality ratio
- + Small file sizes
- + Supports subtitles and metadata
Cons
- − Lossy compression by default
- − Can require licensing for some codecs
FLV
Pros
- + Small file sizes
- + Once-universal web compatibility
Cons
- − Adobe Flash is deprecated
- − No modern browser support
- − Should be converted to MP4 or WebM
MP4 to FLV — Frequently Asked Questions
Is converting MP4 to FLV free?
Is converting MP4 to FLV free?
Yes, our MP4 to FLV converter is 100% free. There are no hidden fees, no signups required, and no watermarks added to your converted FLV files.
Will I lose quality converting MP4 to FLV?
Will I lose quality converting MP4 to FLV?
Our converter uses high-quality encoding settings to preserve as much of the original MP4 quality as possible in the FLV output. For lossless results, choose the "high quality" preset.
How long does MP4 to FLV conversion take?
How long does MP4 to FLV conversion take?
Most MP4 files convert to FLV in 30 seconds to a few minutes, depending on the file size, duration, and your internet connection. Larger files take longer.
Is it safe to upload my MP4 file?
Is it safe to upload my MP4 file?
Yes. All uploads use encrypted HTTPS connections, files are processed on isolated servers, and converted FLV files are automatically deleted within one hour of conversion.
Can I convert MP4 to FLV on mobile?
Can I convert MP4 to FLV on mobile?
Absolutely. Our MP4 to FLV converter works in any modern browser on iPhone, Android, iPad, Windows, macOS and Linux — no app install required.
What's the maximum file size for MP4 to FLV?
What's the maximum file size for MP4 to FLV?
You can convert MP4 files up to 2GB to FLV for free. For larger files, contact us about our batch and premium options.
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