FLV to MP4 - 6 Ways to Convert and Play FLV Files Anywhere

You find a video, double-click it, and nothing happens. Chances are, it is an FLV file; once popular for streaming, but now stubborn on modern devices. Converting FLV to MP4 solves this instantly, making your videos compatible, easy to share, and ready to play anywhere. This guide will show you how to find a practical solution for converting FLV using Windows, Mac and online solutions. Whether you are watching again, on demand, or creating video presentations, these step-by-step processes will turn your headaches of playback into a problem-free, easy watch.

Part 1. FLV vs MP4

When comparing FLV vs MP4, the differences go beyond just file extension. Understanding these distinctions helps you decide why converting is often necessary. Here's a detailed look:

Converting FLV to MP4 makes your videos more versatile, reliable, and future-proof. Whether you want to watch old clips, share videos online, or edit content for YouTube, MP4 is the clear choice.

Part 2. How to Transform FLV to MP4 on Windows

1. AVAide MP4 Converter

AVAide MP4 Converter is a batch and single FLV to MP4 converter that supports batch and simple conversion of files without any issues. Resolution, bitrate and audio parameters can be adjusted to control the quality of output and file size. Hardware acceleration makes sure even large videos can be converted fast, and the intuitive and clean interface makes it user-friendly both to beginners and power users.

Step 1Use the following button to download AVAide MP4 Converter latest version to your Windows PC. Install and open it, and start using the app.

Step 2Select the Add File button on the upper interface. Go to the folder with the FLV video you wish to convert and then choose it, and click on the Open button to upload it into the application.

Step 3Set the output format to MP4. The format, including resolution, encoder, frame rate, and audio quality, can be customized to fit your needs or the needs of your device.

Step 4Now it is time to start converting your FLV file to MP4 by clicking Convert All. The video will be processed fast, and when that is complete, you can open the MP4 file and play it or share it with others.

2. VLC

VLC Media Player is more than a media player for playing DVD on VLC; it is also able to convert FLV format to MP4 directly in the app. It also enables user customization of both video codecs of videos, frame rate, and quality of audio, which gives you control over the end product. It might not be as polished as more specific converters, but its flexibility and complete free nature make it a reliable option for all who would like a free solution.

Step 1Launch VLC Media Player on your computer. From the top menu, click Media and select Convert / Save.

Step 2Click Add and browse to the FLV file you want to convert. Once selected, click Convert / Save at the bottom to proceed.

Step 3Under Profile, select Video - H.264 + MP3 (MP4) as the output format. Set the folder for the converted file, then tick Start to begin the conversion process. Your FLV will be encoded into MP4 and ready to use.

Part 3. How to Transform FLV to MP4 on Mac

If you are a Mac user, converting FLV files does not have to be complicated. Here are two reliable tools that make it easy to change the FLV to MP4 with smooth playback and compatibility.

1. HandBrake

HandBrake is one of the most popular tools on Mac for video conversion. It supports almost every format and lets you transfer FLV to MP4 with ease. On top of basic conversion, it also provides sophisticated features such as video codec choice, frame rate mappings, and subtitle addition. The interface can be initially quite technical, but it is potent and free, so it makes it a default option when a user needs to be free in selecting and also maintain control.

Step 1Install and open HandBrake on your Mac. Click Open Source to upload the FLV file you want to convert.

Step 2Under Format, choose MP4 as the output. You can also adjust video settings like codec, frame rate, or resolution if needed.

Step 3Select a destination folder for your file, then click Start Encode. HandBrake will now alter the FLV to MP4, saving it to your chosen location. If the file size of the converted file is too large, you can operate Handbrake to compress the video.

2. Permute

Permute is intended to suit Mac users who like a drag-and-drop interface. It enables you to transform FLV into MP4 without any hassles, automatically optimizing the video in order to play it smoothly. In comparison to HandBrake, Permute is concerned with simplicity; ideal when one wants a quick result without getting deep into too many settings. It is also helpful in batch processing, meaning you can process a bunch of FLV files simultaneously and save time without losing anything.

Step 1Download and launch Permute on your Mac. Drag and drop your FLV into the main interface.

Step 2From the format options, select MP4 as your output type. You can leave the default settings or tweak them for higher quality.

Step 3Tick the Start button to prompt the conversion. Permute will quickly transform FLV to MP4, and your video will be ready for playback.

Part 4. How to Turn FLV to MP4 Online

The quickest method is the online conversion in case you are not interested in installing the software. Web-based tools such as Invideo and Zamzar operate right in your browser and thus are a convenient option when you only require quick results.

1. Invideo

Invideo is a simple FLV to MP4 video converter that works completely online. It doesn't require installation, and you can upload directly from your device.

Step 1Open the Invideo converter page in your browser and click Select your file to add your FLV file.

Step 2From the available format list, select MP4 as your output format.

Step 3Click Convert File, then download the finished MP4 file to your computer.

2. Zamzar

Zamzar has been around for years and is well-known for supporting many file formats. It's a great option if you want to quickly learn how to turn FLV into MP4 without complex settings.

Step 1Go to Zamzar's official site and hit Choose Files to upload your FLV video.

Step 2Pick MP4 from the format dropdown menu as your output.

Step 3Press Convert Now and wait for the process to finish. Once done, download your MP4 file.

By Sylvie Hyde on Sep 18, 2025