FLV – Flash Video
FLV is the video format used by Adobe Flash. Flash is discontinued, so FLV files are mostly old downloads that need converting to play on current devices.
More FLV conversionsDrop your FLV files here
or click to choose FLV files · up to 95MB each
How to convert FLV to MP4
- Choose your files. Click Select File or drag your FLV files into the upload box. You can add many at once.
- Pick the settings. MP4 is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
Why convert FLV to MP4?
FLV is the old Flash video format. Flash is gone, and most players and phones no longer open FLV. Converting FLV to MP4 rescues old downloads and recordings so they play anywhere.
When to keep the FLV
There is no reason to keep the FLV once you have the MP4: nothing plays FLV that cannot also play the MP4.
Tips for the best result
- The video becomes H.264 and the sound AAC, which every device plays.
- The MP4 is ready for uploading to YouTube, Facebook or your website.
- Old FLV videos are often small; the MP4 keeps the original resolution.
Common problems and fixes
- The file will not convert.
- The download may be incomplete or damaged. Try to get the file again.
- The sound is out of sync.
- Some FLV recordings have timing errors. The converter keeps the timing in the file, so the source needs fixing.
MP4 – MPEG-4 Part 14
MP4 is the most widely supported video container. It usually holds H.264 or H.265 video with AAC audio and plays on nearly every phone, computer, TV and browser.
More MP4 conversionsConverting FLV to MP4
- Re-encoded with widely compatible codecs (H.264/AAC for MP4, MOV, MKV; VP9/Opus for WebM).
Frequently asked questions
Can I still play FLV files?
Players such as VLC can, but phones, TVs and browsers generally cannot.
Is FLV to MP4 free?
Yes, free and without sign-up.
How do I convert FLV to MP4?
Click Select File or drop your FLV file onto the upload box. The converted MP4 appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.