Top 5 Convert FLV to MP4 Converters

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Convert FLV to MP4 online in a couple of clicks. To convert large FLV files to MP4, use Movavi’s desktop converter.

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Edited by
Ben Jacklin
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Key takeaways

  • This article profiles five FLV to MP4 converters: Movavi Video Converter, Convertio, FreeConvert, CloudConvert, and VEED.
  • Tools have some catches, though: in some, free tiers may limit file size; others add watermarks, and third restrict advanced features.
  • Your best selection depends on whether you need online vs offline software, whether you want editing instruments, and how big or weird your FLV files are.
  • To get sharp output: test one file first, pick matching codec/bitrate settings, and avoid huge files in free modes.

I grabbed FLV files, dragged them into every converter I could find, and watched which ones survived the grind. Trust me, there were plenty that choked. The FLV format was built back in the Flash era, meant to stream video through browsers. But since Adobe pulled the plug on Flash at the end of 2020, any .flv you’ve got is basically a relic.

So yeah: if you’re staring at a dusty FLV file, you want to convert it to MP4, as soon as possible. It plays almost everywhere, on almost anything. Don’t know how to change FLV to MP4? All five converters below handle that, some online, some offline. I tested every one of them, picked the top products, and laid out what works (and what stumbles).

In what follows, you’ll see how to convert FLV to MP4 (step by step for each solution), a FLV vs. MP4 comparison, and the answers to FAQs that’ll save your sanity.

My Top Picks

Best overall: Movavi Video Converter

Movavi is a champion! With its offline magic and unrivalled features, it's your go-to for utterly smooth and quality video conversions.

Best free online tool: Convertio

Convertio is your super-easy online buddy. It handles over 300 formats, making conversions quick and simple. No installs to occupy your machine’s space!

Best for large files: CloudConvert

Got huge files? CloudConvert's your hero. It handles massive files with advanced quality tweaks, perfect for your gorgeous high-res video conversions.

Best for simplicity: FreeConvert

FreeConvert is all about easy-peasy! It offers a highly simple process, perfect when you just need quick results without any extra fuss.

Best for AI features: VEED

VEED brings the future! Its innovative AI (think Fabric 1.0) lets you turn still images into talking videos, adding a cool, creative twist to everything.

Comparative Table: Convert FLV to MP4

Product

Conversion Type

Batch Processing

Advanced Editing Tools

Free Plan Limitations

Platform

Ideal For

Download

Movavi Video Converter

Desktop & Online

Yes

Yes (trim, crop, rotate, color adjust, AI upscaling)

Watermark on output

Windows, macOS

Users needing robust editing and batch processing

Download for Free
Download for Free

Convertio

Online

Yes (limited on free plan)

Basic editing (rotate, crop)

100 MB file size limit

Browser-based

Quick, simple conversions

Read More

Best ways to convert FLV to MP4

1. Movavi Video Converter

Download for Free
Download for Free

  • Why I picked it:

    No bloat, no mess. Just a clean way to convert FLV to MP4 for free in seconds, which is absolutely admirable

Movavi is hard to beat in terms of its versatility, and FLV to MP4 conversions are just some of its immeasurable capabilities. It excellently handles video, audio, and images. You can do trimming, cropping, rotating, adjusting color, and sound. It also offers AI upscaling, letting you bump up resolution (2×, 4×, maybe 8×) without destruction.

In my experience, converting FLV to MP4 with Movavi Video Converter it really impressed me. It surely quietly dominates what I’d call “conversion field work.” I shoved in weird-codec FLVs, and it spat out MP4s with clean audio/video sync. Then I ran two heavy files in batch mode, and it beat many other apps in stability. Honestly, after seeing how well it handled edge-case FLVs, I’m convinced it’s one of the best in its class.

How to convert FLV to MP4 with this software:

  1. Open Movavi Video Converter and Add Media → Add Video, choose your FLV.
  2. Under the Video tab, select MP4 as the target format.
  3. Use Edit (scissors icon) if you want to trim or crop.
  4. Click Convert (green button).
  5. Grab your output MP4 when it’s done.

RATINGS

5/5

Capterra

4.8/5

G2

4.6/5

Crozdesk

Pros:

  • Strong support for many formats, speedy conversion.

  • Plethora of editing features (trim, crop, rotate, color) built in.

  • Batch processing capability.

Cons:

  • It’s paid software after a trial period.

  • A free mode is limited to several days

  • Free plan adds a watermark to the output

How to convert FLV to MP4 on Windows and Mac with Movavi

With Movavi Video Converter, you can convert FLV to MP4 in just a few clicks! The app supports over 180 media formats and can work with video, audio, and images. Movavi’s FLV file converter can handle batch conversion, so you can convert multiple files simultaneously. The conversion speed is higher than in free FLV-to-MP4 converters that work online. The program lets you not only change FLV to MP4 but also edit and compress your files.

Changing file formats is easy with Movavi’s FLV-to-MP4 converter: download the app, import your files, set the output format, and launch the conversion. You can use this FLV-to-MP4 converter for free during a 7-day trial period.

Follow the simple steps below to learn how to convert FLV to MP4.

Step 1. Install the FLV-to-MP4 converter on your computer

Download the FLV-to-MP4 converter for Windows or Mac and run the installation file. Follow the instructions on the screen to install the program.

Download for Free
Download for Free

Step 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 from FLV to MP4.

Step 3. 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.

Step 4. Compress the FLV files (optional)

You can reduce the size of particularly 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.

Step 5. Edit the uploaded files (optional)

Before you convert your Flash® videos to MP4, 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.

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 or Crop to get rid of unwanted details, cut away the edges of your videos, or rotate the footage.

Step 6. Convert your Flash® video to MP4

Converted files are saved to the “Movavi Library” folder by default. To change the output folder, click Save to. To convert your FLV file to MP4, hit the Convert button.

Step 7. Upload video to your mobile device (optional)

The folder with converted files will automatically open as soon as the 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.

Great! Now you know how to change an FLV file to MP4. To sum it up, when you have a small file, it’s easier to convert FLV to MP4 online. If you have large files and want to do some editing, you’ll need a desktop file converter from FLV to MP4.

2. Convertio

  • Why I picked it:

    Quick, online, and sweat-free. You don’t have to install anything to convert FLV to MP4. For conversions of the go, it’s superior.

Convertio is a cloud-based FLV to MP4 app that works entirely in the browser. It supports over 300 file formats and is furnished with modern settings like codec choice, resolution, and video rotation. Conversions happen in the cloud. What does it mean? Well, your PC stays light! More than that, files are automatically deleted after 24 hours for security. It’s fast for small to medium files and perfect if you need a simple, no-limit solution without installing offline software.

Eager to test this agendaless service, I dropped a few FLVs into Convertio, selected MP4, and hit convert. The process was smooth, and the files came out clean with synced audio/video. I tried a slightly unusual FLV codec, and it handled it without errors. Batch conversion worked for a few files at a time, though larger files needed the paid plan. It’s a dependable tool when you want a fast FLV to MP4 converter free and online.

How to convert FLV to MP4 with Convertio:

  1. Go to Convertio.co in your browser.
  2. Click Choose Files and upload your FLV files from your device, Google Drive, or Dropbox.
  3. Select MP4 as the output format under the video tab.
  4. Optional: Click the gear icon to tweak resolution, codec, or rotate the video.
  5. Click Convert and wait for the process to finish.
  6. Download your MP4 files when ready.

RATINGS

4.6/5

Capterra

4.4/5

G2

Pros:

  • No software installation required, works on all devices.

  • Supports 300+ formats with advanced settings.

  • Cloud conversion keeps your PC free of heavy processing.

Cons:

  • The free plan has a file size limit (100 MB).

  • Batch conversion for many or large files requires a paid plan.

3. FreeConvert

  • Why I picked it:

    No hassle, no downloads, and it runs straight from the browser with no limit for small conversions.

FreeConvert is a web-based FLV to MP4 converter free tool that saves you from bloated software installs. It handles large files, supports dozens of formats. Recently, it has rolled out tools that let you remove pages, extract pages, password-protect, and resize PDFs, along with general fixes.

This isn’t just another FLV to MP4 app. It’s a flexible online workspace where you can convert FLV to MP4, compress, and even tweak codec settings.

I first tested it on a chunky FLV clip, and the process was fast, smoother than I expected. No lag, no stalling. The preview worked, and I liked how the advanced options let me change FLV to MP4 resolution or bitrate without fuss. I didn’t need a FLV to MP4 converter download, which was refreshing compared to clunky offline software.

How to convert FLV to MP4 with FreeConvert:

  1. Go to the FreeConvert Video Converter website.
  2. Click Choose Files and upload your FLV.
  3. Pick MP4 from the dropdown.
  4. (Optional) Hit Advanced Settings to adjust resolution, codec, or size.
  5. Press Convert to MP4 and wait.
  6. Hit Download when it’s done.

RATINGS

4.3/5

G2

5/5

Workspace

Pros:

  • Works online, no install required

  • Supports GPU acceleration for faster jobs

  • FreeConvert supports more than 1500 file conversions

Cons:

4. CloudConvert

  • Why I picked it:

    Online powerhouse: no installs, just solid conversion tools.

CloudConvert works as a full-fledged FLV to MP4 platform in your browser. It supports many formats, lets you change codecs, resolution, quality, and even add watermarks or custom settings. Their blog announced GPU-based video encoding support for H.264, HEVC, and AV1 for speed boosts. According to their API changelog, they bring out updates and bug fixes every month or so. The product is definitely a project they clearly keep humming along.

I actually dropped some FLV clips into CloudConvert, picked MP4, and clicked convert. The uploads were decent in speed, and the output came clean—video and audio synced. I tested a weird FLV format and it handled it, though large files needed more patience.

How to convert FLV to MP4 with CloudConvert (online):

  1. Go to cloudconvert.com/flv-converter.
  2. Click Select File (or drag & drop) to upload your FLV.
  3. Choose MP4 from the format menu.
  4. (Optional) Hit the gear/settings icon to tweak codec, resolution, or file size.
  5. Click Convert and wait.
  6. Download the finished MP4 when ready

RATINGS

4.7/5

G2

4.3/5

Capterra

Pros:

  • Works in the browser, and no offline software is needed.

  • Many control options (codec, quality, resolution).

  • Uses GPU encoding for faster jobs now.

Cons:

5. VEED

  • Why I picked it:

    It’s quick, flashy, and does more than you expect when you just want to change FLV to MP4 without downloading some bloated junk.

VEED isn’t your typical FLV to MP4 app. Instead, it runs straight in your browser and doubles as a full video editor. Their new Fabric 1.0 drop lets you spin a still image into a talking head, which shows they’re not slowing down on features. Core work? It nails conversion, trimming, subtitles, and even AI voice dubs. No fluff, just raw tools that keep evolving.

When I first ran a batch of FLVs through it, I expected hiccups. Instead, it sliced them into MP4s smoothly, no limit drama, no sync issues. I even tried pushing a weird old clip, and the output looked surprisingly clean. If you’re hunting for a FLV to MP4 converter free and online, this one earns its spot.

How to convert FLV to MP4 with VEED:

  1. Go to VEED Video Converter.
  2. Hit Upload Your File and drop in your FLV.
  3. From the format list, pick MP4.
  4. Tap Convert File and let it run.
  5. Download your shiny new MP4 once the process finishes.

RATINGS

4.6/5

Techjockey

4.6/5

G2

Pros:

  • Converts FLV to MP4 straight online, no software install needed.

  • Extra editing perks like trimming, subtitles, and voiceovers are baked in.

  • It lets you play with the output, add subtitles, and make more tweaks.

Cons:

How to choose the best software to change FLV to MP4

Identifying the perfect FLV to MP4 converter depends on your goals, device, and longing for extra features. If you want speed, stability, and professional-grade editing, Movavi Video Converter is never the wrong choice. It splendidly handles tricky FLVs, batch jobs, and fine-tuning. For those who just need a quick, online conversion without installs, Convertio works beautifully. The platform supports hundreds of formats with modern settings.

If you crave precise control and advanced options for professional projects, CloudConvert gives you codec tweaks, resolution choices, and GPU-based encoding. Mobile or browser-based editing? VEED shines with trimming, subtitles, and extra creative tools right in your browser. Lastly, for budget-conscious users who still want flexibility, FreeConvert lets you handle large files, adjust codecs, and even play around with extra online tools without installing software.

disclaimer_person

Here’s what Movavi’s team does to provide you with verified information:

  • When selecting products to include in our reviews, we research both demand and popularity.

  • All the products covered in this article have been tested by our team.

  • When testing, we compare key characteristics, including supported input and output formats, quality loss when converting, and other significant features.

  • We study user reviews from popular review platforms and make use of this information when writing our product reviews.

  • We collect feedback from our users and analyze their opinions of Movavi software as well as products from other companies.

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 parameter

FLV

MP4

File extension

.flv, .f4v, .f4p, others

.mp4

Video-coding formats

Sorenson, VP6, Screen Video, H.264/MPEG-4 AVC

H.264, H.265, MPEG‑4, others

Audio-coding formats

MP3, Nellymoser, ADPCM, LPCM, AAC, Speex

MP3, AAC, AC‑3, others

Device and OS compatibility

Requires additional codecs to be installed on PC and Mac, no native support for mobile devices

Compatible with almost all devices and operating systems

Movavi Video Converter

The ideal way to get your media in the format you need!
Download for FreeAbout the Windows version
Download for FreeAbout the Mac version

Movavi Video Converter

Frequently asked questions

Which is better: FLV or MP4?

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.

How do I convert FLV to MP4 using Windows Media Player?

Windows Media Player doesn’t have a conversion feature.

How do I convert FLV to MP4 with OBS?

  1. Go to File and click Remux Recordings.

  2. In the OBS Recordings column, click the three dots and select your FLV file.

  3. Hit Remux.

Go to the OBS website

How do I convert FLV to MP4 on a Mac?

To change file formats on your Mac, use Movavi Video Converter.

  1. Download and install the program.
    Download Movavi Video Converter

  2. Launch the program and hit Add Media > Add Video. Select a file.

  3. Open the Video tab and select the desired preset from the MP4 group.

  4. Click Convert.

How do I convert FLV to MP4 with VLC?

Here’s how to change FLV to MP4 in VLC:

  1. Go to Media and pick Convert/Save.

  2. Click Add and select the file for conversion. Hit Convert/Save.

  3. In the profile field, select Video – H/264 + MP3 (MP4).

  4. Click Browse and indicate the folder for export. Enter the file name with “.mp4” at the end.

  5. Hit Start.

Go to the VLC website

How do I convert FLV to MP4 with FFmpeg?

  1. Put your FLV files in the same folder where you store FFmpeg. Then, hold the Shift key and right-click inside the folder.

  2. Select Open command or Open PowerShell window here. A command prompt will appear on the screen.

  3. Enter the following command with an appropriate file name:
    ffmpeg -i filename.flv newfilename.mp4

Go to the FFmpeg website

Can I convert MP4 to MPEG?

Yes, you can convert MP4 to MPEG using most video converters. There is no shortage of reliable and free tools, both online and offline. Just pick your product, set the format, and hit convert. Easy as that.

Is MP4 an MPEG file?

Not exactly. MP4 is part of the MPEG family (MPEG-4), but the file extension and container differ.

What is the best MP4 to MPEG4 converter?

Movavi Video Converter nails it. Speedy, stable, and packed with editing tweaks, it keeps your output video clean and perfect for further use.

See other useful how-to guides

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