FLV to MKV Converter
Convert your FLV video into high-quality MKV format with 100% Secure processing. No files are uploaded to our servers.
or drag and drop your FLV files here
Popular FLV Conversions
Direct 1-Click Fast PresetsHow to Convert FLV to MKV?
Convert your video files in seconds with zero software installation and 100% Secure local processing.
Select FLV Video
Click the "Choose FLV Files" button or drag and drop your FLV video file into the drop zone.
Configure Target & Settings
Verify that MKV is selected. Adjust optional parameters (such as frame rate), then click "Convert to MKV".
Instant Secure Download
Once the 100% Secure conversion finishes locally in memory, click "Download MKV" to save your file immediately.
FLV (Flash Video)
Source FormatWhat is a FLV file?
FLV is a container file format used to deliver digital video content over the Internet using Adobe Flash Player. Converting FLV to modern MP4 or WebM ensures playback across all contemporary devices.
How to open a FLV file?
Plays in VLC or convert to universal MP4 here.
MKV (Matroska Multimedia Container)
Target OutputWhat is a MKV file?
MKV is an open-standard, flexible video container that can hold an unlimited number of video, audio, picture, or subtitle tracks inside one file. It is widely used for high-definition video distribution.
How to open a MKV file?
Can be played using VLC Media Player, KMPlayer, PotPlayer, or easily converted to universal MP4 format right here.
Your Videos Never Touch Our Servers
Video files often contain personal moments, family memories, or confidential business recordings. SM Convert processes every video locally using your computer's secure memory and WebAssembly engine. No uploads, zero cloud servers, complete privacy.
100% Client-Side
Executed locally in RAM
Instant Audio Extraction
Extract MP3/WAV in seconds
Unlimited & Free
No subscription fees or quotas
Other FLV Video Converters
Convert Other Video Formats to MKV
Frequently Asked Questions (FAQs)
How can I convert videos to MP4 or WebM online?
Simply drag and drop your video file (MOV, MKV, AVI, etc.) into the converter above, choose MP4 or WebM as your output format, and click "Convert Video". The conversion processes locally on your computer with zero server uploads.
How can I extract audio (MP3/WAV) from my video?
Select your video (MP4, MOV, WebM, etc.), choose MP3 or WAV in the format dropdown, and click convert. The audio track is separated and saved locally in seconds.
What is the maximum video file size I can convert?
Because processing runs locally with 100% Secure execution without server uploads, files under 200 MB to 500 MB convert with optimal speed and performance depending on your device's available RAM.
Are my video files stored on any cloud server?
Never. Your video files are processed strictly inside your device's secure memory using WebAssembly and Web Audio APIs. They are never transmitted over the internet or saved to any external hard drives.