Step 1: Supply your FLV files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted WebM files.
FLV to WebM Conversion FAQ
What does the FLV to WEBM converter do?
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FLV is a legacy container, often poorly supported on modern devices. Converting to WEBM rewraps the video with a current codec (H.264 / H.265 / VP9) for broad browser, phone, and TV compatibility.
Will resolution and frame rate be preserved in the WEBM?
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Yes. FLV → WEBM keeps resolution, frame rate, and aspect ratio unchanged by default. To change them, use the Resize or Speed tool on the result.
Will the FLV play smoothly on modern devices after converting to WEBM?
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Yes. Legacy FLV files often fail to play in modern browsers and on iOS / Android. WEBM uses widely supported codecs that play natively on phones, tablets, smart TVs, and every modern browser.
Will the converted WEBM be a different size than the FLV?
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Modern codecs compress better, so WEBM from a legacy FLV is typically 30-60% smaller at equivalent quality. Conversions in the opposite direction can grow the file.
Can I add selectable subtitles once the file is WEBM?
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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. WEBM 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. WebM is deliberately narrow: VP8 or VP9 video (AV1 more recently) with Vorbis or Opus audio, and nothing else.
Is WEBM worth targeting for a video on a web page?
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For a page you control, yes. WEBM was built for exactly that job — it plays inline in every current browser with no plugin, no licence fee and no patent exposure, which is why it became the default for embedded and background video. Away from the browser it is the weaker choice: editing software, phone galleries and televisions largely ignore it, so it is a delivery format rather than a storage one. Keep the master in something else and publish this. WebM plays natively in every modern browser with no plugin, no licence fee and no patent exposure, which makes it the default for web-embedded video.
Will the WEBM 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. WEBM plays inline through the native HTML5 video element with no plugin and no external application.
Is it worth converting old FLV recordings to WEBM 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 WEBM 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 there a file-size limit when converting FLV to WEBM?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several FLV files to WEBM at once?
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Yes. Drop or pick multiple FLV files in one upload — the converter processes them in parallel and returns a ZIP of the WEBM results. There is no need to repeat the upload step per file.
What happens to my FLV files after the conversion?
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Uploaded files and WEBM outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
Will my WEBM play on phones, tablets, and TVs?
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Yes — WEBM uses modern codecs that play natively on iOS, Android, Smart TVs, game consoles, and every modern browser.
