Step 1: Drop your FLV files using the button above or by deposit and leave.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Receive your converted MP4 files.
FLV to MP4 Conversion FAQ
How do I convert an FLV file to MP4?
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Upload your FLV file using the picker above and the converter detects the source type and runs the FLV → MP4 pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions.
Can I add selectable subtitles once the file is MP4?
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Yes. FLV has no usable soft-subtitle track, so subtitles for FLV content had to be burned into the picture or shipped as a separate sidecar file. MP4 carries subtitles as their own selectable stream, so after conversion you can attach an SRT track the viewer can switch on, switch off or restyle. Almost every MP4 in the wild is H.264 video with AAC audio; the container also legally holds HEVC, AV1 and VP9.
Will the MP4 play in a browser when the FLV would not?
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Yes, and that is usually the whole reason for the conversion. An FLV embedded in a web page either shows a broken player or forces a download, because browsers ship no decoder for it. MP4 plays inline through the native HTML5 video element with no plugin and no external application. MP4 is the safest possible delivery target — every phone, browser, console, editor and Smart TV built in the last decade plays it without extra software.
Is it worth converting old FLV recordings to MP4 at all?
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For anything you intend to keep, yes. FLV belongs to an earlier generation of video tooling and the software that reads it is steadily disappearing from phones, browsers and operating systems. Moving the footage to MP4 now, while a clean decoder still exists, is the difference between an archive you can open in ten years and one you cannot. No current browser, phone or TV can play FLV — anything still in this container has to be moved out of it to remain watchable.
Is the FLV to MP4 converter free?
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Yes — basic FLV → MP4 conversion is free with no registration. Premium adds higher per-file size limits, more parallel batch workers, and removes ads.
How big an FLV file can I convert to MP4?
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Free accounts: up to 100 MB per FLV file. Premium: typically 1 GB per file, depending on the FLV source type. Very large files are split into chunks server-side when the MP4 format allows.
Will conversion change the content of my FLV?
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Conversion preserves all information that both FLV and MP4 can represent. Format-specific features that the MP4 format doesn't support (e.g. vector data in raster output, formulas in plain-text output) are rasterized or stripped — see the format-specific notes on the result page.
Can I convert many FLV files to MP4 at once?
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Yes — drop multiple FLV files into the upload zone and they are queued in parallel. Premium has more parallel workers; on a 50-file batch this is the difference between minutes and seconds.
Does the FLV to MP4 converter work on phones and tablets?
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Yes — the UI is responsive and the conversion pipeline runs server-side, so mobile devices upload-then-download just like desktops. iOS and Android browser file pickers (camera roll, Files app) work end-to-end.
Which browsers does the FLV to MP4 converter support?
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Chrome, Firefox, Safari (15+), Edge, and Opera. The converter uses standard `<input type="file">` upload — no WebAssembly or PWA dependencies — so even older browsers work.
Are my FLV files kept private?
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Yes — uploaded FLV files are processed in isolated workers and deleted within minutes. We never view, retain, or share content. See /privacy/ for the data-retention window.
What if the MP4 download doesn't start automatically?
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Disable any pop-up blocker, then click the download button manually. The result link stays active for 24 hours, so if your network fails mid-download, you can re-trigger from the result page without re-uploading the FLV.
