# Convert FLV to MKV

> Convert FLV to MKV online for free. Runs entirely in your browser, so your files never leave your device. Fast batch conversion, no sign-up, no watermarks.

URL: https://www.converterrr.com/flv-to-mkv

- Runs in the browser with FFmpeg (WASM): files are not uploaded, and no credits are used.
- Engines: FFmpeg (WASM) (browser), FFmpeg (cloud).
- API: available. `POST /api/v1/jobs` with `"output_format": "mkv"` (paid plans).
- More: [Video converter](https://www.converterrr.com/video-converter), [FLV converter](https://www.converterrr.com/flv-converter).

## How to convert FLV to MKV

1. **Add your FLV files.** Drag and drop FLV files onto the converter, paste them, or click to browse. You can add several at once.
2. **Choose MKV.** MKV is already selected. Open Options if you want to change quality, size or metadata.
3. **Convert.** Click Convert. Your files are converted right in your browser in seconds.
4. **Download your MKV.** Download each MKV file, or everything at once as a ZIP.

## Good to know

- FLV files are typically used for archived web video from the Flash era, while MKV is best for movies and series with multiple audio and subtitle tracks.
- This conversion runs on FFmpeg (WASM), running locally in your browser — nothing is uploaded and it works even on slow connections.

## FLV vs MKV

|  | FLV | MKV |
| --- | --- | --- |
| Full name | Flash Video | Matroska Video |
| Type | Video | Video |
| Extensions | .flv | .mkv |
| MIME type | video/x-flv | video/x-matroska |
| Best for | archived web video from the Flash era | movies and series with multiple audio and subtitle tracks |
| Properties | legacy format | open standard |

**FLV:** FLV is the Flash Video container that powered early web video. Flash is long gone, so these files usually need converting.

**MKV:** MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks in nearly any codec.

The other way around: [convert MKV to FLV](https://www.converterrr.com/mkv-to-flv).

## Related conversions

- [MKV to FLV](https://www.converterrr.com/mkv-to-flv) (in the browser)
- [FLV to MP4](https://www.converterrr.com/flv-to-mp4) (in the browser)
- [MP4 to MKV](https://www.converterrr.com/mp4-to-mkv) (in the browser)
- [FLV to MP3](https://www.converterrr.com/flv-to-mp3) (in the browser)
- [MOV to MKV](https://www.converterrr.com/mov-to-mkv) (in the browser)
- [FLV to WebP](https://www.converterrr.com/flv-to-webp) (in the browser)
- [GIF to MKV](https://www.converterrr.com/gif-to-mkv) (in the browser)
- [FLV to MOV](https://www.converterrr.com/flv-to-mov) (in the browser)
- [WebM to MKV](https://www.converterrr.com/webm-to-mkv) (in the browser)
- [FLV to GIF](https://www.converterrr.com/flv-to-gif) (in the browser)
- [AVI to MKV](https://www.converterrr.com/avi-to-mkv) (in the browser)
- [FLV to WAV](https://www.converterrr.com/flv-to-wav) (in the browser)

## Convert FLV to other formats

[FLV to MP4](https://www.converterrr.com/flv-to-mp4), [FLV to MP3](https://www.converterrr.com/flv-to-mp3), [FLV to WebP](https://www.converterrr.com/flv-to-webp), [FLV to MOV](https://www.converterrr.com/flv-to-mov), [FLV to GIF](https://www.converterrr.com/flv-to-gif), [FLV to WAV](https://www.converterrr.com/flv-to-wav), [FLV to WebM](https://www.converterrr.com/flv-to-webm), [FLV to M4A](https://www.converterrr.com/flv-to-m4a), [FLV to AVI](https://www.converterrr.com/flv-to-avi), [FLV to FLAC](https://www.converterrr.com/flv-to-flac), [FLV to AAC](https://www.converterrr.com/flv-to-aac), [FLV to OGG](https://www.converterrr.com/flv-to-ogg), [FLV to WMV](https://www.converterrr.com/flv-to-wmv), [FLV to Opus](https://www.converterrr.com/flv-to-opus), [FLV to M4V](https://www.converterrr.com/flv-to-m4v), [FLV to MPEG](https://www.converterrr.com/flv-to-mpeg), [FLV to 3GP](https://www.converterrr.com/flv-to-3gp), [FLV to WMA](https://www.converterrr.com/flv-to-wma), [FLV to MPG](https://www.converterrr.com/flv-to-mpg), [FLV to TS](https://www.converterrr.com/flv-to-ts), [FLV to AIFF](https://www.converterrr.com/flv-to-aiff), [FLV to AMR](https://www.converterrr.com/flv-to-amr), [FLV to VOB](https://www.converterrr.com/flv-to-vob), [FLV to M4B](https://www.converterrr.com/flv-to-m4b)

## Convert other formats to MKV

[MP4 to MKV](https://www.converterrr.com/mp4-to-mkv), [MOV to MKV](https://www.converterrr.com/mov-to-mkv), [GIF to MKV](https://www.converterrr.com/gif-to-mkv), [WebM to MKV](https://www.converterrr.com/webm-to-mkv), [AVI to MKV](https://www.converterrr.com/avi-to-mkv), [WMV to MKV](https://www.converterrr.com/wmv-to-mkv), [M4V to MKV](https://www.converterrr.com/m4v-to-mkv), [3GP to MKV](https://www.converterrr.com/3gp-to-mkv), [MPEG to MKV](https://www.converterrr.com/mpeg-to-mkv), [TS to MKV](https://www.converterrr.com/ts-to-mkv), [MPG to MKV](https://www.converterrr.com/mpg-to-mkv), [MTS to MKV](https://www.converterrr.com/mts-to-mkv), [VOB to MKV](https://www.converterrr.com/vob-to-mkv), [M2TS to MKV](https://www.converterrr.com/m2ts-to-mkv), [APNG to MKV](https://www.converterrr.com/apng-to-mkv), [OGV to MKV](https://www.converterrr.com/ogv-to-mkv), [MXF to MKV](https://www.converterrr.com/mxf-to-mkv), [DivX to MKV](https://www.converterrr.com/divx-to-mkv), [3G2 to MKV](https://www.converterrr.com/3g2-to-mkv), [RM to MKV](https://www.converterrr.com/rm-to-mkv), [RMVB to MKV](https://www.converterrr.com/rmvb-to-mkv), [F4V to MKV](https://www.converterrr.com/f4v-to-mkv), [ASF to MKV](https://www.converterrr.com/asf-to-mkv)

## FLV to MKV: frequently asked questions

### How do I convert FLV to MKV?

Drop your FLV file onto the converter above, make sure MKV is selected, and click Convert. When it's done, download the MKV file — it usually takes a few seconds.

### Is it safe to convert FLV to MKV here?

Yes. FLV to MKV conversion happens entirely inside your browser using WebAssembly, so your file is never uploaded to any server.

### Is the FLV to MKV converter free?

Yes — free with no watermark. Signed-out visitors can convert 25 files a day, and a free account raises that to 250.

### Will converting FLV to MKV reduce quality?

No — MKV preserves the content of your FLV file as faithfully as the format allows.

### Can I convert multiple FLV files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

### Can I convert MKV back to FLV?

Yes — use our MKV to FLV converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.