How to use an FLV-to-MP4 converter?

April 20, 2020
14 min

Just follow these simple steps:

  1. DownloadDownload and launch Movavi Video Converter
  2. Import your files into the program
  3. Define the output format
  4. Start the conversion

By clicking the button, you’re downloading the free version of Movavi Video Converter.

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How to Change FLV to MP4

Even though HTML5 is gradually replacing FLV (Flash Video) as the standard for streaming media over the Internet, FLV is still used by over one billion people worldwide for embedded video and on social networks such as Facebook or YouTube. However, to be played on a PC or Mac, FLV requires that you install additional codecs, and many mobile devices don't support this format at all. So if you want to watch a video you've downloaded from the Web on your computer or mobile device, make sure to convert the video to a more universal format such as MP4 or MPEG-4. Movavi Video Converter will help you get this done in no time.

How to Convert FLV to MP4 with the Movavi Converter

With Movavi Video Converter, you can change the format of your video, audio, or image files in one click! No need for any special knowledge of media formats – just run the software, open a movie or video clip, select a ready-made preset, and start the conversion. Follow the simple steps below to learn how to convert FLV to MP4. With Movavi Video Converter, you can change the format of your video, audio, or image files in one click! No need for any special knowledge of media formats – just run the software, open a movie or video clip, select a ready-made preset, and start the conversion.

Follow the simple steps below to convert FLV to MP4.

    1. Install the FLV-to-MP4 Converter on Your Computer

    Download and run the installation file for Movavi Video Converter. Follow the instructions on the screen to install the program.

    2. Add the Video Files You Want to Convert

    To add video files for conversion, click the Add Media button in the upper left corner of the interface, then choose Add Video, and select the files you want to convert.

    3. Edit the Uploaded Files (Optional)

    Before conversion, you can make changes in the files you’ve added via the built-in editing tool. To access it, click the Edit button in the file description.

    Among the tabs in the new window, choose Stabilization to reduce shakiness in your videos. Choose Audio to reduce background noise or otherwise alter the sound volume in the files. Open the tab Adjustments to change the parameters of brightness, saturation, contrast, and others. Choose from a library of creative filters in the Effects tab and apply them to your clips. In the tabs Subtitles and Watermark, you can insert upload subtitles or add a watermark, respectively. Choose either Trim, Crop, or Rotate to get rid of unwanted details, cut away the edges of your videos, or rotate the footage.

    4. Compress the FLV Files (Optional)

    You can reduce the size of particular large files by using the converter. Click the file size value in the description section. In the box that opens, select the desired quality, bitrate, and size values. Click the Convert sample button to convert a small fragment of your file and check out the quality.

    5. Set MP4 as the Output Format

    Click the Video tab. Choose the MP4 preset group, then the appropriate preset. If you want to transform FLV into MP4 for compatibility with your mobile device, click the Devices tab and then locate your device model.

    6. Start Converting FLV Files to MP4

    Converted files are saved to the Movavi Library folder by default. To change the output folder, click Save to. After you have specified all the required settings, click Convert and wait for the conversion to be completed.

    7. Upload Video to Your Mobile Device

    The folder with converted files will automatically open as soon as conversion is finished. Now you can transfer the converted files to your mobile device. Turn on the device and attach it to your computer. Launch the uploading software on your device and follow the instructions or, depending on the device, transfer files to the target folder.


    • Easy to use, even for beginners
    • Converts between 180+ formats
    • Includes editing and compression tools
    • Can merge files


    • Some functions are limited in the trial version

Movavi Video Converter

  • Convert video, audio, DVDs, and image files
  • Enjoy lightning-fast conversion without quality loss
  • Improve quality, adjust sound, trim and join files before converting
  • Save video and audio clips for easy mobile access

How to Convert FLV to MP4 Online

If you don’t want to install any software, online conversion tools can be a useful alternative. Below, you’ll find a list of websites that can help you to convert FLV to MP4 online. Use the links below to get to the websites.

Online Video Converter

This converter supports all popular video and audio formats, including FLV. You don’t need to be a master of conversion – everything can be transformed in just a few clicks. This online app is also a safe one: it deletes your file from the app’s server as soon as you download the converted version.

How to Convert a Video with Online Video Converter

  1. Go to the website via the link below:

    Go to the Online Video Converter website

  2. Hit the Add Your Media button to upload your video. MP4 is the default output format in this tool, so you don’t need to change anything to do an MP4 conversion.

  3. Click Convert. The transformed file will be downloaded automatically. If the download doesn’t start, hit the Download button. And you’re done!


  • Interface is easy-to-use even for beginners
  • Can compress videos
  • Converts full or partial videos


  • File size is limited
  • No support for batch file conversion


This service acts as a multifunctional converter: you can change the format of your videos, audio files, documents, and much more. It also offers a wide range of customization tools.

How to Convert a Video with CloudConvert

  1. Go to the website using the link below:

    Go to the CloudConvert website

  2. Add your file using the Select File button. You can upload several videos at once.

  3. In the drop-down menu to the right of each file name, choose the desired output format.

  4. Click Convert. After the process is complete, hit Download.


  • A very customizable tool: you can choose the video or audio codec or trim the file
  • Can extract the soundtrack from your video or make a GIF from your footage
  • Supports multiple simultaneous file conversion


  • Conversion speeds are low if you don’t have a subscription
  • Supports only the most popular formats


Zamzar is great when you need to convert several small files. This app lets you transform a batch of videos of up to 150 MB each very easily. But if you want to change the format of a movie, you’ll need to buy a subscription plan.

How to Convert a Video with Zamzar

  1. Go to the website. Here’s the link:

    Go to the Zamzar website

  2. To upload your videos, click Add Files and find them on your computer. If you want to convert a video from the web, hit select link to activate the link field and copy-paste the link there.

  3. In the Convert To menu, find the MP4 preset and click it.

  4. Hit the Convert Now button and wait; the conversion may take a while. Click Download on the new page that appears when the conversion is complete.


  • Has many built-in conversion presets, including Apple TV and mobile devices
  • Can convert files in batches
  • Stores your files for 24 hours, so you can download them later


  • The free version runs pretty slowly
  • Can only convert the whole file, not part of it

This tool can be used to not only convert FLV to MP4 online but also edit your video: basic editing tools are included. Also, you can customize the MP4 preset if you want: for instance, switch off the audio track or change the video codec. However, the free version can only process files that are relatively small: 100 MB in total for all videos being converted.

How to Convert a Video with

  1. Follow the link below to get to the website

    Go to the website

  2. Open the Video Converter menu on the left and click Convert To MP4.

  3. Use the Choose Files button to upload your FLV videos.

  4. Click Start Conversion to launch the process.

  5. If the automatic download doesn’t start, hit the Download button.


  • Basic editing tools included
  • Many options for customizing your video: resize, set the output file size, and more
  • Can save your conversion settings if you log in


  • Ads may be annoying
  • Supported file size is limited

How to Convert FLV to MP4 for Free

If you don’t convert files often and so are not sure that shareware will pay off, consider using a free FLV-to-MP4 converter. These kinds of apps may have fewer functions, but that may be enough for one-off conversions. The following links can help you to navigate through the apps that can convert FLV to MP4 for free.


This app is basically a player, but it also has some additional options that include video conversion and capture. So, it can convert FLV files to MP4.

How to Convert a Video with VLC

  1. Download the program via the link below. Install and run the app.

    Download VLC Media Player for Windows or Mac

  2. If you work in Windows, in the Media menu find the Convert / Save option and click it. In the new window, hit Add and locate your FLV file, then click Open. Hit Convert / Save at the bottom.

    If you have a Mac, open the File menu, click Convert / Stream, then locate your video using the Open Media button. Once the file is open, hit Customize and check whether the MP4/MOV encapsulation is selected.

  3. In the Browse field, define where to save the output video. Delete the file extension if you’re a Windows user.

  4. Click Start (or Save on Mac).


  • Provides some editing tools
  • Codecs are customizable
  • Completely free


  • The interface may seem complicated
  • Runs slowly


HandBrake can take any video file and rip or convert it to MP4, MKV, or WebM. The interface is simple with features anyone can master – though more experienced users will be able to use the software to its full capacity. Overall, you just need a file or disc, and with a couple of clicks, you can start converting. Larger files might take some time with this program, so be patient. But rest assured, it will get the job done.

How to Convert a Video with HandBrake

  1. Download the program via the link below.

    Download HandBrake

  2. Open the program and either drop and drag your FLV file into the interface or select the File option on the left side of the screen and select your file.

  3. Next to Format the option for MP4 should be the default conversion option, but if it isn’t, click the drop-down menu and select it.

  4. Choose your file name and destination folder at the bottom of the screen.

  5. Click the Start Encode button at the top of the screen.


  • The very simple conversion process
  • Totally free software
  • Multi-platform, open-source software – Mac, Windows, and Linux


  • The interface looks a little outdated
  • Conversions can be lengthy


This converter app can easily transform files in many different formats. It works relatively quickly but, in the trial version, the resulting files have a branded watermark and intro. Other than that, this program is a good choice, even for beginners.

How to Convert a Video with Freemake

  1. Download the program from the website. Install and launch it.

    Download Freemake

  2. Click the Video button, find the video you want to convert, and hit Open.

  3. At the bottom of the program window, click to MP4. Define the conversion parameters if you want.

  4. Hit Convert. Then click the Continue with logo string (in the free version).


  • Easy-to-apply additional options
  • Lets you embed your converted video in your website
  • Can join multiple files


  • Adds a watermark and an intro to your videos
  • Requests registration (it is not necessary, but you do have to get rid of the additional window)

FLV vs. MP4 Comparison

FLV and MP4 are both video formats used for storing and streaming videos. The main difference between MP4 and FLV is that they are used for different purposes. FLV is a common format for video streaming and is used by websites like YouTube. On the other hand, MP4 is widely used by mobile devices like smartphones, media players, and the like. Additional MP4 vs. FLV comparisons are in the table below.

Comparison ParameterFLVMP4
File extension.flv, .f4v, .f4p, others.mp4
Video coding formatsSorenson, VP6, Screen Video, H.264/MPEG-4 AVCH.264, H.265, MPEG-4, others
Audio coding formatsMP3, Nellymoser, ADPCM, LPCM, AAC, SpeexMP3, AAC, AC-3, others
Device and OS compatibilityRequires additional codecs to be installed on PC and Mac, no native support for mobile devicesCompatible with almost all devices and operating systems

Frequently Asked Questions

An FLV file is stored within the FLV container format. This format is used for streaming video content on the Internet when using the Adobe Flash Player.

FLV is appropriate for uploading and playing videos on the web. But FLV files can’t be played on PCs without additional codecs and are not supported on some mobile devices. So if you want to watch a video on your device, MP4 is a good choice since it’s a universal format supported by almost every player.

FLV is not natively supported on iPhone. But you can install special players that can run FLV files. Another option is to convert FLV files to MP4 or another format that’s compatible with the iPhone.

FLV files are encoded with lossy codecs such as VP6 or H.264. For this reason, FLV files are relatively small in size and can be easily transmitted over the Internet. If you’re looking for a more efficient coding format, try HEVC – in comparison with H.264, this codec provides better data compression at the same bit rate.

The main advantages of FLV files are that they can be played in web browsers and are usually quite small in size.