Convert MKV to FLV

MKV to FLV converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

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All file types supported

About formats

MKV

MKV (Matroska Video) is an open standard, royalty-free multimedia container that can hold an unlimited number of video, audio, subtitle and metadata tracks in a single file. Matroska is popular for high-definition content, anime, and movie archives because it preserves multiple language tracks and subtitle streams. MKV is supported by VLC, MPC-HC and most modern smart TVs.

Developer: Matroska Org
Initial release: 2002
Compression: Lossy or lossless
Color depth: up to 12-bit HDR
Transparency: No
Animation: Yes

Best for

Archiving HD movies with multiple tracks
Storing multiple subtitle languages
Anime and foreign film distribution
Preserving multiple audio streams
High-quality video libraries

Pros

+Open standard and royalty-free
+Holds unlimited video, audio, and subtitle tracks
+Supports lossless and lossy codecs
+Wide support in VLC and smart TVs

Cons

−Not universally supported on mobile devices
−Slightly larger overhead than streamlined containers
−Less ideal for web streaming than MP4

FLV

FLV (Flash Video) is a container format used to deliver video over the web using Adobe Flash Player. Although Flash has been discontinued, FLV files remain common in older video archives. FLV typically wraps Sorenson Spark or VP6 video and MP3 or AAC audio.

Developer: Adobe (Macromedia)
Initial release: 2002
Compression: Lossy
Color depth: 8-bit
Transparency: No
Animation: Yes

Best for

Recovering legacy Flash video archives
Migrating old web video content
Playing retro web animations
Archiving early-2000s online video
Converting old streaming clips

Pros

+Compact streaming for its era
+Wrapped common codecs like Sorenson Spark and VP6
+Widely used in historical web video
+Simple container structure

Cons

−Flash Player discontinued and unsupported
−Low maximum quality and 8-bit color
−No modern codec or HDR support
−Security risks in legacy Flash runtime

How to convert MKV to FLV

1
Select MKV files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.
2
Choose flv — or any other format you need as a result (more than 200 formats supported).
3
Let the file convert, then download your flv file right away.

MKV vs FLV

Property	MKV	FLV
Compression	Lossy or lossless	Lossy
Color depth	up to 12-bit HDR	8-bit
Multi-track	Yes	Yes
DRM support	No	No
Open format	Yes	No

When to use MKV vs FLV

MKV

Archiving HD movies with multiple tracks
Storing multiple subtitle languages
Anime and foreign film distribution
Preserving multiple audio streams
High-quality video libraries

FLV

Recovering legacy Flash video archives
Migrating old web video content
Playing retro web animations
Archiving early-2000s online video
Converting old streaming clips

Use cases for MKV → FLV

Archiving HD movies with multiple tracks
Storing multiple subtitle languages
Anime and foreign film distribution
Preserving multiple audio streams
High-quality video libraries
Recovering legacy Flash video archives
Migrating old web video content
Playing retro web animations
Archiving early-2000s online video
Converting old streaming clips

Frequently Asked Questions

Is converting MKV to FLV free?

Yes. This MKV → FLV converter runs entirely in your browser and is completely free — no account, no credits, no watermark.

Which devices and platforms can I use to convert MKV to FLV?

Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.

Are my MKV files uploaded to a server?

No. Files never leave your device. The entire MKV → FLV conversion runs locally in your browser, so your data stays private.

Can I convert multiple MKV files at once?

Yes — batch conversion is supported. Add as many MKV files as you like and convert them to FLV in one pass, then download the results together.

What is the maximum file size?

There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.

Will converting MKV to FLV reduce the quality?

Because both formats use lossy compression, the FLV output will not bring back any quality that has already been lost in your MKV file. Avoid repeated re-encoding to keep the best quality.

Does FLV support transparency?

No — FLV has no alpha channel. Transparent areas of your MKV file will be filled with a solid background colour in the converted file.

How will the file size change after converting MKV to FLV?

Both formats use comparable compression, so the FLV output will be similar in size to your MKV file — typically within 10–20% of each other.

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FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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