Aimersoft Video Converter Ultimate

Best Video Converter to Convert FLV Files to MP4

  • Quickly converts FLV to MP4 format without quality loss.
  • Supports batch FLV to MP4 conversion at up to 90X faster speed.
  • It supports 500+ formats like MP4, FLV, MOV, MKV, WMV, MPEG, etc.
  • Trim, merge, crop video, or enhance video by adding subtitle, effects, etc.
  • It can download online videos from YouTube, Vevo, Netflix and other 1000 sites.
  • Record screen, burn DVD, burn CD, convert images, etc.
Aimersoft Video Converter Ultimate

Ultimate Ways to Convert FLV to MP4 on Mac/PC/Online/Free

Jun 25,2019 • Filed to: Convert MP4 • Proven solutions

FLV is a flash video file that is majorly used for video playback on YouTube and other online video sharing sites. So if you have downloaded videos from one of these sites on your PC and want to play it on your phone or other players, converting it to a compatible format like MP4 is required. Using a desktop, online or other programs FLV to MP4 conversion can be done. Know more about these programs.

Part 1. Best Way to Convert FLV to MP4 at 90X Faster Speed

Aimersoft Video Converter Ultimate is a versatile video processing software that supports converting FLV to MP4 in a hassle-free way. With the lossless quality process, the program works at high speed (90X) and also supports batch processing to save time and efforts. Local, as well as videos from your camcorders and other devices, can be added to the program for the conversion process. The converted files can further be transferred to an array of devices for playback.

Aimersoft Video Converter Ultimate

Aimersoft Video Converter Ultimate

  • FLV to MP4 conversion supported without losing original file quality
  • FLV to MP4 and other conversions processed at 90X faster speed
  • Batch processing facilitated to convert multiple files at a time
  • An array of pre-set device-specific formats supported for conversion
  • Allows video download from more than 1000 sites including YouTube, Facebook, Vimeo, and others
  • Video transfer to iPhone, Android, and other devices supported
  • Additional features include video compression, video recording, DVD burning, video editing, and others
  • Windows and Mac supported

Guide to convert FLV to MP4 using Aimersoft Video Converter Ultimate

01 Add FLV videos to Aimersoft FLV to MP4 converter

Install and open Aimersoft Video Converter Ultimate on your PC. Add the FLV videos to be converted by clicking on the +Add Files button on the Convert tab. You can simply drag and drop the files as well. Batch processing can be done by adding multiple files.

add video

02 Choose MP4 as the target format

The list of formats supported by the program can be checked by opening the drop-down options at Convert all files to: tab. Choose MP4 from the Video list. Also, select the file resolution as desired.

choose mp4

03 Convert FLV to MP4

Clicking on the Convert All button will start the process of FLV file to MP4 conversion. The converted file on PC can be checked from the location at Output tab.

flv to mp4

Part 2. 2 Free FLV to MP4 Converters

A number of free programs to convert FLV to MP4 are available as well. Listed below are the top 2 free FLV to MP4 converters in the category.

1. FFmpeg

FFmpeg is a free and open-source FLV to MP4 converter that allows recording, converting and streaming a number of audio and video formats. This cross-platform tool comes packed with a number of libraries and programs that can handle video, audio, and other streams and multimedia files. FFmpeg is basically a command-line based tool that can be used for decent transcoding, editing, and other functions. So to convert FLV videos to MP4, the tool works as a decent choice. The command to convert FLV videos to MP4 using FFmpeg is:

ffmpeg -i filename.flv -sameq -ar 22050 filename.mp4

2. VLC Media Player

VLC is a popular media player that is free to use. This open-source player works on all platforms including Windows, Mac, Linux, and others and in addition to video playback, allows video conversion to widely used formats. With VLC FLV files can be converted to MP4 and other formats in a simple and quick manner.

Guide to convert FLV to MP4 free using VLC Media Player

Step 1: On your PC, launch the VLC player app. On the main interface, open Media > Convert/Save option.

Step 2: From the pop-up window, click on the +Add button on the File tab to import local FLV videos to be converted. Once the video is added, click on the Convert/Save button at the bottom.

Step 3: A new pop-up Convert window will open. Under the Settings section, enable the Convert option and then choose MP4 as the format from the Profile list.

Step 4: Next, choose the destination location and file name on PC to save the converted video. Click on the Start button to finally start processing and converting added files.

free vlc to mp4

Limitations of free converters:

  • The format support for the conversion is limited
  • Majority of the tools does not allow batch conversion
  • Limited or no options for file editing
  • The conversion speed is slow
  • The output quality is not guaranteed

Part 3. Tools to Convert FLV to MP4 Online

If you do not want to download and install any additional software on your PC for conversion task, online tools can be used. There are a number of FLV to MP4 online converters available that help you convert FLV files to MP4 directly from the browser window. Listed below are 3 tools to convert FLV to MP4 online.

1. Online UniConverter


Previously known as, this online conversion tool allows converting your FLV videos to MP4 in decent quality. A range of audio and video formats for conversion are supported by the program. At a time, two files can be added to the interface for the process. After the conversion, you can download the files to your PC or to your Dropbox account.


  • Support to an array of video and audio formats
  • Allows to save the converted file to Dropbox
  • A free tool with a simple interface


  • Only two files at a time can be added
  • Converted files need to be downloaded


2. ConvertFiles


Using ConvertFiles, local and online FLV videos can be added to the program for conversion to an array of formats. One file at a time can be added to the interface for the conversion process. With the simple interface, you just need to add the video and choose the target format. The process once complete, allows you to download the converted file to your PC. Option to get the converted file on mail is also there.


  • A free tool with a simple interface
  • Option to get the converted file on email
  • An online and local file can be added


  • Only one file at a time can be added
  • Slow file upload and conversion speed
  • Internet dependence


3. Zamzar


With Zamzar, FLV and other videos can be converted to MP4 and an array of other videos, audio, image, and preset formats. The user-friendly interface makes the program simple to use for all users. Files can be added through your PC or through a link in case of online video. The processed videos can be downloaded on PC or you can even get them on your email id if needed.


  • No need for software download or installation
  • Support range of video, audio, and pre-set formats for conversion


  • No support for video editing
  • The site comes with ads
  • No support for batch processing and additional features.


So for basic FLV to MP4 conversions, free and online tools can be used, but for high-quality processing with additional features, professional software like Aimersoft Video Converter Ultimate works best. You can free download it below.

Part 4. FLV vs MP4

What is FLV?

FLV is simply defined as the Flash video file format. It was created by Macromedia for the exclusive use of the Adobe Flash Player. These videos are commonly embedded in SWF files. Flash video is very popular over the internet. As a matter of fact, it is the format of choice by many video sharing sites such as YouTube, VEVO, Hulu, MetaCafe, and Yahoo! Video. It is also the video format adapted by the news agency for their news website.

What is MP4?

MP4 is the standard video format created by Moving Pictures Experts Group and is certified by ISO. It is the format widely used in streaming media, DVD's, videophones, and even broadcast television. MP4 is also the same as MPEG-4, which is the latest variation of this file format. MP4 is still being improved and tweaked up to this day.

FLV vs MP4

For the longest time, MP4 and FLV are battling it out head-to-head as far as video file format popularity over the internet is concerned. Online videos became the turf of the FLV before, since the Flash plug-in for browsers are highly available and easily downloadable. FLV makes it easier for web owners to display videos and their visitors to watch them. But now, the MP4 format is functioning almost in the same way. Modern browsers can now support the playback of MP4 videos in the same way they can work with FLV. As a result, many of today's HTML5-based web pages are opting for the more easily created MP4 video files for their websites.

Elliot Carter

staff Editor

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