Aimersoft Video Converter Ultimate

Best Video Converter to Convert MP4 to FLV

  • Easily convert MP4 to FLV for uploading to YouTube, facebook, and more other platforms.
  • Convert more than 500 formats, including MP4, MOV, FLV, MKV, AVI, VOB, etc.
  • Download or record online video from YouTube and other 1000 sites.
  • A built-in video editor allows you to cut, rotate, merge video, add effects and more.
  • Transfer video from computer to iPhone, iPad, iPod or Android phone easily.
  • Burn DVD/CD, compress video, extract audio from video, etc.
Aimersoft Video Converter Ultimate

How to Converter MP4 to FLV (Flash) for Uploading Online

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

Facebook, Hulu, YouTube, and all other popular social networking platform and other sites use FLV (Flash) format to embed videos. So if you have videos in MP4 format that you want to upload in your site or post on your social media platform, to convert MP4 to FLV format is a good way to avoid incompatibility issues. Using a good MP4 to FLV converter, the task can be done in a quick manner with high-quality files.

Part 1. How to Convert MP4 to FLV (Flash) Easily on Mac/Windows PC

Aimersoft Video Converter Ultimate is a Windows and Mac-based desktop software that works as an excellent video-toolbox. It supports more than 500 formats for conversion in high quality including MP4 to FLV conversion. The customization of the files is made possible using the built-in editor of the program. Batch processing allows adding multiple files from your computer as well as directly from devices for the conversion task. Transfer of files to iPhone, Android, flash drive and other devices are also supported.

Aimersoft Video Converter Ultimate

Aimersoft Video Converter Ultimate

  • Allows converting MP4 to FLV and other 500 formats in lossless quality, including MP4, FLV, MOV, MKV, WMV, AVI, etc.
  • MP4 to FLV batch conversion supported for processing multiple files at a time.
  • Facilitates video editing using the built-in editor offering features like crop-trim, rotate, effect, and others.
  • Video download from more than 1000 sites supported.
  • Recording on computer activities and online videos supported.
  • Additional features include video transfer, DVD/CD burning, convert images, and others.
  • Compatible with Windows and Mac system.

Guide to Convert MP4 to FLV using Aimersoft Video Converter Ultimate

01 Add MP4 files to Aimersoft MP4 to FLV converter

Run Aimersoft Video Converter Ultimate on your PC and load the MP4 videos to be converted. You can add the files by clicking on the +Add Files button or alternatively by dragging and dropping it to the interface. Multiple files and files from devices can also be added.

add mp4

Tips: Editing options are available under the added video thumbnails.

02 Choose FLV as the target format

There are a number of video formats and pre-set devices supported by the software as output files. The list of these formats can be checked by clicking on drop-down options at Convert all files to: option at the top-right corner. From the Video tab, select FLV as the format. Also, choose the file resolution.

add mp4

03 Convert MP4 to FLV with 1 click

Hit on the Convert All button to convert added MP4 videos to FLV format. The files on your computer save on the location selected at the Output tab. The Converted tab on the interface includes the processed files that can be transferred and managed.

Convert MP4 to FLV

Free download Aimersoft Video Converte Ultimate below to convert MP4 to FLV or any other formats. You will find more than video conversion in it!

Part 2. MP4 to FLV Converter Online Tool

Using online programs eliminates the hassle of software installation and registration as these programs works from your browser window. For basic conversion needs, online tools are good options. Know about the top 3 MP4 to FLV converter online tools below.

1. Online Convert


Using this online conversion tool your MP4 files can be decently converted to FLV and other popular formats. The files can be added through the computer, Google Drive, and Dropbox. Online videos through the link can also be added. For customization, the files can be cropped flipped, and rotated. Video editing through the change in parameters is also supported by the tool. There is also an option to save the settings for future conversion. Converted files need to be downloaded from the interface.


  • Allows editing and change in file parameters
  • Videos can be cropped, flipped, and rotated if required


  • The interface comes with ads
  • No batch processing
  • Internet dependence

online convert

2. Online UniConverter


Earlier known as, this online conversion tool supports a range of video and audio files for conversion including MP4 to FLV. The program needs no installation and can be worked from your Windows or Mac browser. Two files at a time can be converted using the tool and once processed you can download the video to your PC or to a Dropbox account.


  • Free to use software with a simple interface
  • Supports popular video and audio formats


  • Only two files at a time can be processed
  • No option for file customization or video editing
  • The converted file needs to be downloaded


3. Zamzar


Using Zamzar your local as well as online MP4 videos can be converted to FLV format in decent quality. The files can also be dragged and dropped to the interface. Files up to 50MB can be added to the interface for the conversion process. An array of video, audio, image, and presets are supported as output files. The converted files are available on the program for download and if needed they can also be received on your mail id.


  • Supports a wide range of video, audio, image, and preset formats
  • Free software with an easy interface


  • One file at a time can be added
  • 50MB is the maximum file size limit
  • File parameters cannot be changed if needed


For simple conversions with basic features online programs work well but for your professional conversion needs where you need high-quality files with added features like customization, editing, batch processing, transfer and other, a versatile tool like Aimersoft Video Converter Ultimate is definitely the best choice.

Elliot Carter

staff Editor

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