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How to Convert MP4 to FLV Format on Windows (10)?

Since lots of users need to convert MP4 videos to FLV file format for collection or uploading, this article will exploit a method for converting MP4 to FLV. Just jump to the preferred part to learn how to free convert MP4 to FLV format on Windows 10/8/7 with only a few clicks.

Table of Contents:

  • Method 1. Offline MP4 to FLV Converter
  • Step 1. Download free MP4 to FLV converter.
  • Step 2. Add MP4 file.
  • Step 3. Choose FLV as output format.
  • Step 4. Click "Run" to start converting.
  • Method 2. Convert MP4 to FLV Online
  • Step 1. Open the online MP4 to FLV converter in the browser.
  • Step 2. Import the MP4 file.
  • Step 3. Choose the parameters for your FLV file.
  • Step 4. Click "Convert to FLV" button to start.

Best Free MP4 to FLV Converter Download - Recommended

Free Video Converter is your best choice. This program is pretty handy and helps easily convert a large MP4 file into a much smaller FLV file for posting on your blog or onto an online video sharing site like YouTube and Facebook.

Why Convert MP4 to FLV?

FLV is more popular in video streaming and used by websites like YouTube and Hulu, while MP4 is more popular in portable devices. FLV is also much smaller than other video formats and the video quality is also terrific, so it is a format that’s really suitable for uploading to websites. So, MP4 to FLV conversion is essential, namely uploading videos from your device to streaming sites is much easier. In the following words, they will explain how to convert MP4 to FLV for faster uploading speed and excellent video quality. The two ways list various examples and you can choose the one you like most according to your needs.

Method 1. With Free MP4 to FLV Converter Software

Some of you may mightily display unwillingness to install software on PC because of the time-consuming installing process or any other. But, considering the safety issue of online tools, we list desktop video converter as the most ideal way.

There are many choices, and WinX Video Converter is an outstanding example that you can trust to convert MP4 to FLV stably, and vice versa convert MP4 to FLV in high quality. No annoying adware, virus and spyware, it enables smooth converting process much more pleasant. Below are the detailed steps you can follow up.

Convert with WinX Video Converter

Step 1. Import an MP4 video to WinX Video Converter.
Install and run WinX Video Converter on your PC. Then click "+ Video" button on the top menu bar to import the MP4 video. You can also load several MP4 videos to convert because WinX Video Converter supports batch video conversion.

Step 2. Choose "FLV Video" as the output.
When the "Output Profile" window popup, just choose FLV as the output video format. FLV video output can be found in the category "PC General Video". If you want to upload the MP4 video to YouTube or Facebook, you can simply specify a FLV video output from category "Web Video Profile". BTW, you can also choose the preferred video/audio codec, bit rate, frame rate, aspect ratio and video resolution.

Step 3. Select the destination folder to store the converted FLV video.
Simply click "Browse" button at the bottom to select the destination folder to save the FLV video converted from MP4 on your computer.

Step 4. Start converting MP4 to FLV.
The last thing is to click "RUN" button and WinX Video Converter will start the converting process on your Windows (10). If you want to convert 4K MP4 videos, you are suggested to turn on Hardware Acceleration mode to accelerate the speed.

Convert MP4 to FLV

Besides converting MP4 to general PC FLV (H.263 + libmp3lame), MP4 to YouTube FLV (H.264+MP3), MP4 to Facebook FLV (H.264+MP3) and other websites videos, you are also allowed to use this free video converter to convert between any formats, including MP4, HEVC, H.264, MKV, AVI, MTS, AVCHD, etc.

Optionally, you can trim the video clips. Drag the handle of the bar under the video preview window to trim the video clips to convert as you wish. Leave it default if you want to convert the entire MP4 video. This function is also available by setting the start time and end time in the output setting area.

Top 3 MP4 to FLV Converter Software

WinX Video Converter

Movavi Video Converter

Wondershare Uniconverter


H.263+libmp3lame, H.264+MP3




1280x720, 960x640, 640x480, 480x320, 320x240, 320x180, keep original

640x480, 384x288, 320x240, original size

240x160, 320x240, 480x320, 640x360, 640x480, 720x480, 720x576, 768x576, 750x1334, 800x480, 854x480, 960x540, etc.


Low to High

Low, Medium, Good, High, Best

Low to High

High speed conversion

Intel/nVIDIA/AMD hardware acceleration

Intel hardware acceleration


Method 2. Via Online MP4 to FLV Converter

You have great freedom to choose one as there is a list of free MP4 to FLV online converter on the Google search results. As the converting process from these converters are similar, here will only display one to teach you how to use these online MP4 to FLV video converters. After comparison as showed in below table, we select FreeConvert as the best because of its basic MP4 to FLV conversion function and bonus features. Surely, you can choose the one based on your needs.

Convert with FreeConvert

Step 1. Go to https://www.freeconvert.com/flv-converter. Make sure your network is always working.

Step 2. Import the MP4 file you want to convert.

Step 3. Click the Settings button to get Advanced Options.

Step 4. Click on "Convert to FLV" to start converting your MP4 file to FLV.

Step 5. Then, download the FLV video to your computer.

List of Online MP4 to FLV Video Converter










Aspect ratio

4:3, 14:9, 16:9, original

Stretch if needed, Keep aspect ratio, Do not upscale


1:1, 3:2, 16:9, 4:3, 2.20:1, 2.35:1, 1.85:1

Video codec

Original, x264, Sorenson

Sorenson, h.264, screen_video, screen_video_2

H.264 (AVC), Flash Screen Video, Flash Screen Video Version 2, FLV (Flash Video, Sorenson H.263)

Original, Sorenson, H.264, screen_video, screen_video_2

Audio codec

Original, aac, aac_he_1, aac_he_2, opus, vorbis

mp3, pcm_u8, pcm_s16_be, pcm_s16_le, adpcm, aac, asao, speex


AAC, AAc-HE version 1, AAC-HE version 2, MP3, ADPCM_SWF, Original





1 - 59.94

More Information About MP4 and FLV




MP4 is a container format commonly used to store video, audio, subtitles and still images. Like FLV, it also allows streaming over the Internet.

FLV is a container file format used to deliver digital video content (e.g., TV shows, movies, etc.) over the Internet using Adobe Flash Player version 6 and newer.

Developed by

International Organization for Standardization

Adobe Systems Incorporated

Video codec

HEVC/MPEG-H Part 2/H.265, MPEG-2 Part 2, MPEG-4 ASP, H.264/MPEG-4 AVC, H.263, VC-1, and others

Sorenson, VP6, Screen Video, H.264/MPEG-4 AVC

Audio codec

MPEG-2/4 (HE)-AAC, MPEG-1/2 Layers I, II, III (MP3), AC-3, Apple Lossless, ALS, SLS, and others

MP3, Nellymoser, ADPCM, LPCM, AAC, Speex








Nearly everywhere

Mainly in video streaming


author - Kistent Waung

Kistent Waung twitter icon

Graduated from Nanyang Technological University, Singapore, she employs herself in IT related content creation (since 2013) and happens to perfectly combine her major (computer & science) and her gusto (writing). She's seasoned at offering video audio conversion workarounds and always passionate about new trends, from hot HEVC, 4K to the new AV1 codec.

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