4 Best Free FLV to MP4 Converters for Windows (with Tutorial)

Launch Free HD Video Converter Factory, and you’ll see two modules on the home interface. Choose Converter. Then click Add Files to import your FLV video or directly drag the source file into the software.

Click the format image on the right side of the interface, go to Video, and select MP4 as the output format.

Optional: You can use the editing tools under the imported video to trim, rotate, crop, or add special effects to your video. Moreover, you can change the video bitrate, resolution, frame rate, volume, etc. in the "Parameter settings" section.

Click the ▼ button at the bottom to set an output folder. Then press Run to start the conversion. Once the process is completed, a window will pop up and prompt you to check the converted file.

HandBrake is another popular converting tool for Windows. It can help you convert from nearly any format to a selection of common formats and codecs, including FLV to MP4. This open-source tool also allows you to add subtitles, modify presets, trim/cut/crop videos, and even rip DVDs.

Get HandBrake from the official website→

How to convert FLV to MP4 free with HandBrake?

Step 1: Run HandBrake after you install it on your PC.

Step 2: On the "Source Select" page, click "File" to load your FLV file. You can also drag and drop it into the program directly.

Step 3: Under the "Summary" tab, choose "MP4" from the "Format" drop-down list.

Step 4: Move to "Dimensions" where you can resize the video. Then go to the "Video" tab to select a video codec, adjust the video quality, and change other settings as you need.

Step 5: Click the "Browse" button to rename the file and specify an output path.

Step 6: Press "Start Encode" on the top menu bar to start the FLV to MP4 conversion.

FFmpeg is a free and cross-platform multimedia framework designed to process video and audio files. It’s capable of playing, recording, converting, streaming videos and audio, as well as ripping DVD to digital formats. But since FFmpeg is based on the command line, it won’t be easy to use for beginners. If you want to try this conversion method, do the following:

In the DOS window, enter the folder where storing the .flv files. For example, the path of my FLV files is "D:\flvFolder", how to convert FLV to MP4 free using FFmpeg?

Step 1: Press Win + R and input cmd to enter the DOS window. Input d: to enter the D disk.

Step 2: Type in cd flvFolder. (Now, you are in the FLV folder.)

Step 3: Input FFmpeg command line: for /R %f IN (*.flv) Do ffmpeg -i "%f" –c copy "%~nf.mp4". Then, you will get the converted .mp4 files.

In this free FLV to MP4 converter, you can also input proper command lines to change the video parameters as you desired. (Not recommended to inexperienced users.)

Get FFmpeg from the official website→

An FLV converter to MP4 free online offers a convenient way to do the video conversion. And you can find a lot of online converters that directly work from your browser. The operation is quite easy (usually 3 steps). But those web-based tools always have restrictions on file size, amount, format, resolution, etc. For instance, Zamzar only imports a single file smaller than 50MB, Freefileconvert allows a combined size of 300MB, and Cloudconvert supports multiple files with a max of 1GB. What's more, during the operation, you should make sure your internet in a stable condition. If it fails, retry to finish the conversion.

Now, I take cloudconvert.com as an example to show you how to convert FLV to MP4 free online.

Step 1: Visit the site: https://cloudconvert.com/flv-to-mp4

Step 2: Click "Select File" to add your FLV files.

Optional: Press the wrench icon to change the resolution, video codec, trim, add watermark, etc. Then, click "Okay" to save your settings.

Step 3: Click the "Convert" button to start uploading and converting your FLV files.

Step 4: When the process is over, download and save the converted MP4 files to your local folder.