WebM to FLV converter
A free WebM to FLV converter for WebM files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your WebM files here
or browse your device · paste with Ctrl+V
Accepts .webm files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your WebM files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
FLV is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your FLV
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
WebM
WebMGoogle's royalty-free container built for HTML5 video, pairing VP8 or VP9 with Vorbis or Opus. Smaller than H.264 MP4 at matching quality, and supported by every current browser.
- Developed by
- Released
- 2010
- Extension
- .webm
- MIME type
- video/webm
- Compression
- Lossy
- Specification
- Open
FLV
Flash VideoThe container that carried web video through the YouTube-and-Flash years. Flash was retired at the end of 2020, so any FLV you still have needs converting to MP4 to stay playable.
- Developed by
- Adobe / Macromedia
- Released
- 2002
- Extension
- .flv, .f4v
- MIME type
- video/x-flv
- Compression
- Lossy
- Both WebM and FLV are lossy formats, so repeated conversions can accumulate rounding artifacts. Keep this to only what you need and avoid repeated round-trips.
Questions about converting WebM to FLV
Is this WebM to FLV converter free?
Yes. Converting WebM to FLV here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my WebM file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for WebM to FLV?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Does converting WebM to FLV lose quality?
FLV is a lossy format, so some detail is discarded when it is encoded. At the default quality setting the change is often not visually obvious; keep your original WebM file if you might need it again.
Can I convert several WebM files to FLV at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does WebM to FLV work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to FLV
21 formats can become FLV here.
Convert WebM to other formats
A WebM file can become any of these.
FLV to WebM
The reverse conversion
WebM to MP4
WebM to MP3
WebM to WAV
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