F4V to MKV converter
Convert F4V to MKV in seconds, free and unlimited. No upload, no sign-up, no watermark: your video never leaves your device.
Last updated
Quick answer: To convert F4V to MKV, add the F4V file to the iHateFiles F4V to MKV converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. F4V is a format most software has stopped opening. MKV is not.
Should you convert F4V to MKV?
A safe conversion: F4V and MKV are both lossless, so this is a change of container rather than a change to the picture.
Nothing is discarded
F4V and MKV are both lossless, so every pixel survives the move intact. Convert back and forth as often as you like; the image does not degrade.
F4V and MKV side by side
| F4V | MKV | |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | No | No |
| Animation | No | No |
| Written here | No | Yes |
What usually goes wrong
About the F4V. Renaming .f4v to .mp4 very often just works, because it already is one.
About the MKV. MKV and WEBM share a signature because WEBM is a restricted Matroska, so tools sometimes report one as the other. What matters is the codecs inside.
How to convert F4V to MKV
- Add your F4V file. It is read from your disk and stays there.
- Check the settings. The output format is already set to MKV.
- Press convert and the MKV file is saved back to your device.
Questions
How do I convert F4V to MKV?
Open this page, add your F4V file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this F4V to MKV converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to MKV lose quality?
MKV is a lossy format, so some detail is discarded. The quality control on this page decides how much. The default is set high enough that most people cannot see the difference.
Can I convert several F4V files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.