Convert FLV to MP4
Fast, free, and secure FLV to MP4 conversion. No registration required.
Fast, free, and secure FLV to MP4 conversion. No registration required.
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High Quality
Maintain maximum quality during conversion
Fast Processing
Convert files in seconds with our optimized engine
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Files automatically deleted after conversion
How to Convert FLV to MP4
Upload FLV File
Click the "Select File" button to upload your flv file from your device.
Start Conversion
Click the "Convert" button to instantly start converting to MP4.
Download MP4
Download your converted mp4 file immediately after processing.
Why Convert FLV to MP4?
Converting from FLV Video (Flash Video) to MP4 Video is useful when you need universal compatibility (plays everywhere). FLV Video (Flash Video) has limitations: flash player discontinued in 2020. MP4 Video addresses this by offering universal compatibility (plays everywhere) and excellent quality-to-size ratio. MP4 (MPEG-4 Part 14) is the most widely used video container format, supported by virtually every device, browser, and platform.
Xonvert uses professional-grade conversion tools to ensure the highest possible quality when converting FLV Video (Flash Video) to MP4 Video. The output is optimized for the target format's strengths.
FLV vs MP4 — Technical Comparison
| Feature | FLV | MP4 |
|---|---|---|
| Container | Flash Video | MPEG-4 Part 14 |
| Video Codecs | Sorenson Spark, VP6, H.264 | H.264, H.265, AV1 |
| Audio Codecs | MP3, AAC, Speex | AAC, MP3, AC3 |
| Status | Deprecated (Flash EOL 2020) | — |
| Successor | MP4 with H.264 | — |
| Subtitles | — | SRT, SSA, VobSub |
| Streaming | — | HTTP Live Streaming (HLS), DASH |
About FLV Video (Flash Video)
FLV (Flash Video) was once the dominant video format for web streaming, used by YouTube, Hulu, and most video websites in the Flash Player era. While Flash has been discontinued, many legacy video files remain in FLV format and need conversion to modern formats like MP4.
Strengths
- ✓ Compact file sizes
- ✓ Quick to decode
- ✓ Still common in legacy content
- ✓ Wide conversion tool support
Limitations
- • Flash Player discontinued in 2020
- • No modern browser support
- • Limited audio/video codec options
- • No future development or updates
Developed by Macromedia/Adobe (2002)
About MP4 Video
MP4 (MPEG-4 Part 14) is the most widely used video container format, supported by virtually every device, browser, and platform. MP4 typically uses H.264 or H.265 video encoding with AAC audio, delivering an excellent balance of quality and file size for streaming, downloads, and playback.
Strengths
- ✓ Universal compatibility (plays everywhere)
- ✓ Excellent quality-to-size ratio
- ✓ Supports streaming and progressive download
- ✓ Stores subtitles, chapters, and metadata
Limitations
- • Patent-encumbered codecs (H.264/H.265)
- • Not ideal for lossless archival
- • Re-encoding reduces quality
- • Container format (quality depends on codec)
Developed by ISO/IEC (2001)
FLV to MP4 — Frequently Asked Questions
What is the difference between FLV and MP4?
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FLV Video (Flash Video) flv (flash video) was once the dominant video format for web streaming, used by youtube, hulu, and most video websites in the flash player era. MP4 Video mp4 (mpeg-4 part 14) is the most widely used video container format, supported by virtually every device, browser, and platform. The key differences are: FLV Video (Flash Video) offers compact file sizes, while MP4 Video provides universal compatibility (plays everywhere).
Will I lose quality converting FLV to MP4?
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Xonvert uses professional-grade conversion tools to ensure the highest possible quality when converting FLV Video (Flash Video) to MP4 Video. The output is optimized for the target format's strengths.
When should I use MP4 instead of FLV?
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Use MP4 Video when you need web video streaming or social media uploads. Universal compatibility (plays everywhere). Use FLV Video (Flash Video) when converting legacy flash video content.
Can I convert FLV to MP4 for free?
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Yes. Xonvert lets you convert FLV to MP4 completely free with no registration. Free users get a daily conversion limit. Upgrade to Pro ($4.99/mo) for higher limits, larger file sizes, and priority processing.
What are the best use cases for MP4?
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MP4 Video is best for: Web video streaming; Social media uploads; Video downloads and storage; Mobile video playback. Universal compatibility (plays everywhere). Excellent quality-to-size ratio.