mp4 to flv
MP4 to FLV - UniConverter
  • Convert MP4 to FLV, MOV, AVI easily and other 150+ video & audio formats.
  • Built-in video editor allow to trim, crop, add subtitle, watermark, effects to the video.
  • Transfer video to iPhone, iPad, Android and other devices easily.
  • Burn video to DVD with templates.
  • Download videos from YouTube and 1,000 popular sites.
  • Powerful toolbox includes: Fix Metadata, GIF Maker, Screen Recorder, Video Compressor, etc.

MP4 to FLV Converter: How to Convert MP4 to FLV on Mac

by Brian Fisher

Sometimes you have a video file in MP4 and wonder how to convert MP4 to FLV. Well, FLV (short for Flash Video) it's an appropriate format for sharing on YouTube, Facebook, Hulu or other streaming sites. If you want to upload video to these sites, I think you'd better change video to FLV format first. But how? That's easy! All you need is a MP4 to FLV converter. In this article, we recommend you the best video converter to do the MP4 to FLV conversion, step by step.

Part 1. How to Convert MP4 to FLV on Mac/Windows PC with the Best FLV Converter

As you make a plan to convert MP4 to FLV for uploading to the internet easily, well, maybe for other purpose, you are suggested to use the professional converter like UniConverter to do the job. A good converting tool is a promoter to provide a fast, efficient MP4 to FLV Mac conversion that keeps your video quality. This program also offers some useful edit functions to make videos more eye-catching.

Get the Best MP4 to FLV Video Converter on Mac and Windows:

  • Convert MP4 to FLV with 3 simple clicks.
  • Convert video between 150+ video formats with 90x faster converting speed, including MP4, FLV, MOV, MKV, VOB, AVI, etc.
  • Extract audio from your video files. It converts video/audio to MP3, WAV, AC3, AAC, AIFF, WMA and more audio formats.
  • Crop, trim, rotate, add subtitles, watermarks or other effects to your video with built-in video editor.
  • Burn MP4 or FLV videos to DVD whenever you want.
  • Download or Convert online videos from YouTube or other popular video sites like Vimeo, Vevo, Facebook, Hulu, Dailymotion and so on.

Easy Steps to Convert MP4 to FLV on Mac and Windows PC

Like other desktop program, please firstly download and install UniConverter on your Mac or Windows computer. You can get the program from the Free Download buttons above. It works on MacBook, MacBook Pro, MacBook Air, iMac (macOS 10.7 Lion to 10.15 Catalina included); Windows 10/8/7/Vista/XP. When it is successfully installed, it's good to make the MP4 to FLV conversion. Now let's see how to do it.

Step 1: Import MP4 files

Run the MP4 to FLV Video Converter and drag & drop your MP4 files to the program. Or you can go to "Add Files" to locate the MP4 files you want to add. (It supports batch conversion, so if you have some MP4 videos, you can drop them to be converted at one go.)

Import MP4 files

Step 2: Pick FLV as the output format

Go to the Video category in the bottom format tray and choose "FLV" as the output format.

Note: With this Mac converter, you can also edit your video before you start the conversion. For example, you can add effects to you videos such as gray, emboss, negative, old film etc. You can check this out in the guide of UniConverter.

Pick FLV as the output format

Step 3: Start MP4 to FLV Mac conversion

Click the "Convert" button and let this excellent Mac Video Converter do the rest for you! Now from the "Converted" tab, you can see the MP4 video has been converted to FLV. Open the folder to get it for further use!

start MP4 to FLV Mac conversion

Why not download this video converter and have a try! You will find something cool in this program. It has a Toolbox which offers VR converter, video compressor, screen recorder, GIF maker and more.

Can't miss:
2 Methods to Compress Video for YouTube Uploading >>
How to Download YouTube Video >>

Part 2: 8 Online MP4 to FLV Converter

#1. FLV Crunch

A video converter for Mac which supports a wide range of formats can convert anything into everything. The software does not support all kinds of formats but is sure reliable. You can convert your MP4 file to FLV format in a jiffy. All you have to do is to download the software and follow some easy steps to convert the files. You just need to upload the MP4 file, select the FLV format and convert. The results will be of good quality. You can do this job easily with the user friendly interface of the software.

Converts videos quick and has a friendly interface.
Less video editing tools.

free mp4 to flv converter

Why Choose UniConverter for Mac/Windows



Free Video Converters
Online Converters
Support as many video formats as possible, including MP4, MOV, MKV, AVI, MTS/M2TS, FLV, etc Limited support Limited support
Convert MP4 to FLV with original quality
The conversion speed Very Fast Normal Slow
Directly convert your MP4 videos to video sharing sites like Youtube and Facebook Limited support Limited support
The estimated conversion time display  
Convert MP4 to iPhone,iPad and Android phones directly Limited support Limited support
Fetch and Add Movie & TV Show Metadata for your movies    
Personalize and edit your MP4 videos before conversion Limited support Limited support
Support both Mac/Windows Limited support
24-hour customer support Limited support Limited support
Advertisements free Limited support

#2. Any Video Converter

Convert any kind of video you have whether you have downloaded from any website or YouTube, you can easily convert it into your required format. There are lots of options for you to choose from. All your iOS devices are compatible with this video converter. There are enough tools accompanied that can convert your video to its fullest. The interface of the software is quite trendy and easy to use. You can easily figure out where to find any particular tool. Within a matter of clicks you can get your converted video.

Converts media files into any format you desire in a high-quality video.
The "Play" tab of the video notifies that the video is being played but the screen is always blank. Thus, you cannot play the video on the video converter.

mp4 to flv free converter

#3. WinX Video Converter

WinX is a free video converter that is mainly structured to convert the troubling FLV videos into the MP4 format for easy and successful play. The free video converter supports all videos and audios for conversion and turns them into any format you would like or is easily played on your media player/device. You will easily convert your video and can play it on the media player easily as well. The free video converter works in the best way to give the users the required superior results.

Converts files into high-quality videos and makes it easy to watch.
The free edition supports less devices and formats. So to get all the formats available one has to get the Pro version which is not free.

convert mp4 to flv free


Using a free online video converter is easy than using it by downloading or buying it. Converting your MP4 file into the FLV format on an online video converter is now the easiest thing to do. You can easily convert the file and can even save it on your Dropbox account.

It is absolutely free and works quickly online.
Takes long to convert the video. Patience is required.

convert mp4 to flv online

#5. Zamzar

Zamzar is popular online video converter program that helps the users convert their videos for free. You can convert you MP4 file onto the FLV format pretty easily. Apart from this there are plenty of other formats as well that are supported by the program. Within a matter of four steps your MP4 video will be converted into the FLV format on this online software.

Supports all formats and converts videos quickly.
Slight quality compromise in the converted video.

mp4 to flv converter online

#6. is one of the popularly used video converter sites that can easily convert videos for you online. You don’t have to download the software nor have to buy it. By filling in some requirements you can quickly convert your MP4 video into the FLV format. Use it once and you will surely come back again.

Supports all standard formats.
Average conversion speed.

mp4 to flv online

#7. Convert.Files

Convert.Files is one of the easiest video converter that can be managed by any person. Converting files is just easy. You just have to click on the browse button and upload your file, select your format and click on the convert button. Your video will be converted in no time.

Supports MP4 format and much more.
Conversion speed might slow down due to file size.

mp4 to flv converter online


This FLV converter helps you convert any file format into FLV. You can do the job easily just by uploading the video you want to convert in the MP4 format. Just fill in the requirements of the online converter and have your video converted. Online Convert has made it simple and effortless for you to convert your MP4 videos into the FLV format.

Supports approximately all devices and formats. It can download video from any website as well.
The conversion speed might get slow due to heavy file size.

best mp4 to flv online converter

Related Articles & Tips

This article will introduce how to convert MKV to MOV on Mac and Windows so that you can smoothly play or edit your video on a Mac computer.
If you want to extract WAV from MOV, then the 7 ways to convert MOV to WAV listed in this article can help you a lot. Let's check them out!
If you find it difficult to play FLV videos on QuickTime, then the most effective way to solve it is to convert FLV to MOV. Read this post and you can turn FLV to MOV easily.
This tutorial introduces 3 viable solutions to convert MOV to WMV in Mac and Windows 10 by using the helpful MOV to WMV converters.

Brian Fisher

staff Editor