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ChangeMyFile

Free FLV to MKV Converter Online

Fast, Free, Secure & Simple

Looking to convert FLV to MKV online for free without downloading software? Change My File is your one-stop solution. Our free FLV to MKV converter lets you upload and convert FLV files to high-quality MKV format in just a few clicks. No hidden fees, no limits, and no sign-up required!

Why Use Our Free FLV to MKV Converter?

Converting your FLV files to MKV format has never been easier. Whether you're a content creator, a video editor, or just need compatibility with your media player, our tool is designed to deliver fast, lossless conversions.

100% Free & Secure

Enjoy free FLV to MKV conversion with no watermarks or ads. Your files are encrypted and automatically deleted after processing.

High-Quality MKV Output

Our advanced conversion engine ensures your videos are converted with top-quality resolution and audio fidelity.

Works on Any Device

Use our FLV to MKV converter online from your Windows PC, Mac, iPhone, or Android—right from your browser.

How to Convert FLV to MKV Online?

Follow these simple steps to convert FLV files to MKV using our easy-to-use platform:

  1. Click the Upload FLV File button.
  2. Select the FLV video you want to convert.
  3. Wait for the file to upload.
  4. Hit Convert to MKV.
  5. Download your converted MKV video instantly.
It’s that simple—no technical skills required!

What is the Difference Between FLV and MKV Formats?

  1. FLV (Flash Video) is an older format mainly used for streaming video over the internet. However, it’s no longer widely supported.
  2. MKV (Matroska Video) is a modern, flexible format that supports subtitles, multiple audio tracks, and HD video playback.

That’s why many users choose to convert FLV to MKV—to enjoy smoother playback and better compatibility with today’s devices and media players.

Best Online Video Converter for FLV to MKV

If you're searching for the best online FLV to MKV converter, you're in the right place. We designed Change My File with speed, simplicity, and security in mind.

Popular Use Cases:

  1. Convert old downloaded FLV clips into MKV for your smart TV
  2. Reformat YouTube FLV exports for editing
  3. Turn Flash videos into MKV for offline viewing

Frequently Asked Questions

Can I convert large FLV files to MKV?

Yes, our tool supports large video files up to 2GB.

Is this FLV to MKV converter really free?

Absolutely. We never charge for basic conversions.

Will I lose quality when converting FLV to MKV?

No, we use high-quality encoding to preserve video and audio during the conversion process.

Convert FLV to MKV Instantly – No Signup Required

Don’t waste time downloading complicated software. Convert your FLV to MKV online now for free with Change My File. We guarantee high-quality results, a smooth user experience, and complete privacy protection.

MKV Technical Specifications

File extension.mkv
File categoryVideo
Stands forMatroska Multimedia Container
DeveloperSteve Lhomme
OverviewAn unlimited amount of data such as an infinite number of audios, videos, pictures, arbitrary files like XML and subtitle tracks can be stored in MKV files. Although, it has a similar concept that of AVI, MP4; etc., yet, there is one difference. It is an open-source software or has open specifications, whereas, others are different. Furthermore, it allows online streaming and fast seeking which are alluring features. It can be used with ease as it is highly adaptive and can accept any audio and video.
Technical descriptionFiles in MKV format store each track in varied dataline. Files in this format use distinctive extensions for storing the data. The extension .MKV is used only for video files(may have subtitles and audio),.MK3D for stereoscopic video, .MKA and .MKS for audio and subtitles respectively. The codecs that are linked to this format are .SRT, Vobsub, .USF(Universal Subtitle Format) and .SSA; etc. It should be noted that not all the media players support this file format but only selective ones like VLC. Besides this, ‘Matroska' is derived from a Russian word that is ‘Matryoshka’ and it refers to a hollow Russian doll which opens to uncover another doll, this doll then again opens to reveal next doll and the process goes on. Other meanings for this word in Russia are a sailor suit and a female sailor. Technical details in depth are available only for private and commercial use.
Links

FLV Technical Specifications

File extension.flv
File categoryVideo
Stands forFlash Video
DeveloperAdobe Systems (initially developed by Macromedia)
OverviewIt is a multimedia container file format which is used over the internet to provide digital video content to the users. Digital video content includes TV shows or series, movies; etc. Adobe Flash Player 6 and new versions provide support to it. To play flash video from Personal Computer and online websites we need an FLV player. Although, Apple iOS does not support Flash, yet, with the help of additional software, one can play flash videos. Also, it is a common platform for various websites that allows video streaming such as YouTube, Yahoo! Video, Metacafe, Hulu; etc . With the help of screen capturing and other recording programs, screen recording is possible for flash videos. Furthermore, it also supports a screen share or screen cast.
Technical descriptionFLV files mostly have video bitstreams which are one of the variants of H.263 Standard and it is named as Sorenson park(FourCC FLV1). The SWF files and this extension uses the identical way to encode data. There are two variants available for screen casting. First one is lossy as it reduces colour depth or bit depth (number of bits used to indicate the colour of one pixel) and compresses the data. The second type is only compatible with Flash Player 8 and the newer versions. Both these aforesaid kinds are based on bitmap tile. Uncompressed Audio or ADPCM format audio is also supported by it. This format has header and packets in its video structure. A standard header includes signature, version, flags and header size.
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FLV To Other Extensions