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How to Merge FLV Files [Windows, Mac,Android, iPhone & Online]

Liza Brown
Liza Brown
Originally published May 16, 22, updated Nov 29, 23

It's typical to download numerous small FLV files of a popular movie from YouTube or other video-sharing sites instead of the entire movie. Let me tell you here that an FLV (Flash Video) is a container format used to transmit video or audio over the internet. At this point, you may want to combine multiple FLV files into one. Combining multiple FLV files to create a masterpiece, like a trailer, is of course a terrific idea. Well, to combine these FLV files, you need a professional FLV merger as your assistant.

So, let me help you here. Filmora Video Editor may be the best FLV combiner for Windows and Mac available nowadays. This clever tool is ideal for users seeking professional editing functions like video merging. The software is available for download on Windows and Mac systems and allows for the lossless merging of FLV, MP4, MOV, WebM, and many more file formats. It makes it a lot easier for you to merge or combine FLV files into a large video collection without compromising on video quality even if you lack technical expertise. And, you can use it to watch a movie or your favorite content without any annoying interruptions.

Now, I'll show you how to quickly and effortlessly merge your favorite video clips into a new video collection.

Free Download

For Win 7 or later (64-bit)

Free Download

For macOS 10.14 or later

A Step-by-Step Guide to Merge FLV files on Windows/Mac using Wondershare Filmora

Step 1: Launch Wondershare Filmora and load FLV files…

When you run this FLV joiner, simply click "Import" to load all of the local FLV files that you want to merge to the User's album of this FLV video merger. You can also just drag and drop the target files from your PC into the album.

merge flv

Step 2: Merge FLV files into one…

At the bottom of this FLV file merger, there lies a Timeline. Drag FLV files from the album to the Timeline and use the slider bar to help you arrange all FLV files in the Timeline without overlapping them. That’s very important as if you put one video to another, the original video will get split. Also, make sure that all FLV files are placed in the sequence in which they are to be played. If not, you can rearrange any video clip with a simple drag-and-drop.

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Step 3: Choose the target format as FLV…

When you are sure that all FLV files are in the correct required order on the Timeline, you can view the effect in real-time in the preview pane. If everything is fine, you are now ready to export this new FLV file. All you have to do is just press the “Create”

button, then go to the "Format" tab > "FLV" output format in the output window.

merge flv

Step 4: Export a new FLV file…

Finally, click the "Create" button to save the settings and export the new FLV file simultaneously. When it's done, simply navigate to the whole FLV video using the output file path.

merge flv

Alternative Way to Merge/Combine FLV Files on Windows

Joyoshare Media Cutter (Paid tool to merge FLV Files)

Joyoshare Video Joiner for Windows is a comprehensive and user-friendly audio and video merging software that supports a wide range of file formats such as FLV, F4V, HD,4K, MP4, M4V, M4A, DV, MPEG, FLAV, WMA, and others. It is not only a superb video joiner for joining FLV files in batches without re-encoding, but it is also a video editor thanks to the built-in advanced editing tool. That means you can customize and enhance your FLV files as required before integrating them. The two combing modes (high-speed mode and encoding mode) it employs are also noteworthy. With high-speed mode, you can join an unlimited number of FLV files losslessly and swiftly. You can merge files in different formats without gaps and customize the codec, resolution, bit rate, frame rate, and other parameters of your FLV files while in encoding mode.

A Step-by-Step Guide

Step 1: Add FLV files…

First, go to the Joyoshare website and download the Joyoshare Video Joiner installation package. Install and configure it on your computer. Then, import FLV files into the video joiner. There are two options: click "Open File" to choose them or drag them directly into the software.

merge flv

Step 2: Choose a merging mode and export format…

You must pick a format from high-speed mode and encoding mode based on your requirements by using the "Format" button. The former is only for combining files of the same format losslessly at 60 X speed. The other is for users who want to modify files while joining files in different formats. With the use of a gear icon beside the selected output format, users can change video settings such as resolution, bit rate, codes, and so on while in encoding mode.

merge flv

Step 3: Remove undesirable parts…

Once finished choosing mode and format, simply press "OK" to go back to the main screen. Then double-click these FLV files one by one to preview them. You can change the timeline to remove unnecessary sections from your FLV videos. Moreover, renaming and rearranging these video files can also be realized in this step.

merge flv

Step 4: Edit FLV files (optional)…

The software has an editor that allows you to easily and flexibly enhance your FLV video files by clicking "Edit" next to each file before joining.

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Step 5: Merge FLV files and save…

Finally, all you have to do is press the "Convert" button to enable Joyoshare Video Joiner to begin combining these FLV files. The merged FLV file will be saved as a converted file on your computer.

Format Factory (Free tool to merge FLV Files)

Format Factory is a free Windows video joiner, recorder, converter, downloader, and editor. It supports a wide range of file types, including FLV, MKV, MP4, 3GP, WMV, SWF, AVI, MPG, VOB, WebM, and others. It is not difficult to use it to combine FLV files.

A Step-by-Step Guide

Step 1: Run Format Factory…

After installing Format Factory, go to "Video Joiner & Mux" to proceed.

merge flv

Step 2: Add FLV files…

"Add Files" allows you to import FLV files in batches. When all FLV files have been loaded, click "Clip" to clip and crop FLV files as needed. Then, under "Output Settings," choose an output format and further customize the output quality.

merge flv
merge flv
merge flv

Step 3: Merge files…

Once done, click "OK" to get back to the first window and press "Start" to begin the merging


merge flv

Alternative Way to Merge/Combine FLV Files on Mac

iDealshare VideoGo (Paid tool to merge FLV Files)

You can use iDealshare VideoGo to convert media files for playback anywhere. It supports a wide range of video formats, both SD and HD. The application also features its own editor, which includes a wide range of activities. It allows you to trim the selected video, crop it, modify the brightness, contrast, and saturation, add text and image watermarks, and manage or add your own subtitles.

merge flv

A Step-by-Step Guide

Step 1: Import FLV files…

To import the FLV video files that you want to merge, click the "Add File" button or just drag & drop the files.

Step 2: Choose output format…

Choose FLV as the output video format. Select FLV from the "General Video" category from the "Profile" pop-up menu.

Step 3: Merge FLV files…

Select the FLV video files that you wish to merge into one in the main window list, and then choose the "Merge Selected into One" option from the context menu. Click the "Convert" button to start combining the videos.

merge flv

Faasoft FLV Joiner/Merger (Free tool to merge FLV Files)

Faasoft FLV Joiner/Merger is used to combine FLV files without any re-encoding as well as retain the output quality. Merges FLV files and converts them to more popular formats as well like; MP4, AVI, MOV, WMV, MKV, ASF, ProRes, MXF, OGV, 3GP, etc. to get played on multiple mediums. Apart from FLV files, Faasoft FLV Joiner allows you to merge various kinds of video and audio clips. In addition, this powerful tool works more than just an FLV Merger, i.e.; It is, even more, an in-built video and audio editor, with which, you can optimize any files as per requirement.

A Step-by-Step Guide

Step 1: Load FLV files…

To add FLV files to this Joiner, run FLV Merger and drag and drop the folder containing FLV files to the program's main screen. If the FLV files you wish to merge are not in the same folder, you can drag them one by one to the software. You should put them together first to save time.

Step 2: List to merge…

Once all FLV files have loaded, pick them all and choose "Merge Selected into One" from the context menu. In the task list, the combined FLV file will have an extension name similar to "Merge 1."

merge flv

Step 3: Convert FLV clips…

Click the "Profile" drop-down button to select "FLV Flash Video Format (*.flv)" from the "Picture & Animation" category as the output format. If you want to re-encode the merged FLV file to another video format, select another output format from the list above.

Step 4: Start joining…

Simply click the round "Convert" button in the bottom right corner and let this fantastic tool do the rest.

2 Ways to Merge/Combine FLV Files on Android

Video Merger by Alyaanah (Paid tool to merge FLV Files)

Video Merger can merge any number of videos together in one video. It also accepts almost any format of videos as input. Some of the input formats for merging that are supported are mp4, mkv, 3gp, 3gpp, mov, flv, avi, mpg, mpeg, m4v, vob, wmv, webm, mts, ts, m2ts, and so on. It can also convert the combined video to a variety of formats. Merged output formats supported include mp4, mkv, mov, avi, 3gp, and others. This application allows you to combine videos with different formats, bitrates, and frame rates into a single video. It also scales multiple videos into a single scale and merges them together. It can also merge videos with different resolutions into one video. The merged videos can also be compressed together maintaining original quality to a smaller sized video than all the original video sizes combined.

Video merger allows you to merge in three different ways as follows;

Side by side:

Choose two files, and they will be merged in a side-by-side format (Horizontal stack).


Choose two files, and they will be merged top to bottom (Vertical stack).


You can select unlimited files and they will be merged one after the other in a sequential format.

VideoChain by Arypex Initiative (Free tool to merge FLV Files)

Now you can combine video files from your Android device camera as well and for free. VideoChain is an easy to learn and use app (with in-built instructions) that allows you to easily combine video clips to create one video using the most advanced encoding techniques. It is an excellent tool for merging video clips from your front and rear cameras, as well as portrait and landscape video files, into a single file. It can combine MP4, MPEG, MKV, FLV, and other video clips with four different quality/compression settings available.

2 Ways to Merge/Combine FLV Files on iPhone

Magisto Video Editor (Paid tool to merge FLV Files)

It is a wonderful app to put FLV clips together on an iPhone. Using this versatile video editing app, you can merge multiple videos and create eye-catching files of up to 5 minutes. You can add text, colors, and even text slides between video frames to the video. The app's filters can be used to further enhance the files. The app also supports a large library of audio files, which you can use to add music to your video files. And, to use all of the app's features, you must have a paid subscription.

merge flv
merge flv

iMovie (Free tool to merge FLV Files)

iMovie is one of the most popular video editing apps for iOS users. You can edit and merge videos on iMovie with ease. The app is free and secure. If you are looking for a professional way to put two videos together on your iPhone, iMovie can be a good choice. FLV videos can be converted to WMV, M4V, and other popular video formats after merging. You can also modify the video output settings and delete the selected video segments as well.

A Step-by-Step Guide

Step 1: Launch the iMovie app on your iPhone. In the Projects window, press the + button.

merge flv

Step 2: In the New Project window, select Movie. Browse through your video clips in the gallery and import them.

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Step 3: Tap Create Movie at the iPhone screen’s bottom. The videos will automatically get merged in the iMovie timeline.

Step 4: Select the desired video file. You can include transition effects, background music, and other profiles.

Step 5: Tap Done to combine two videos into one on the iPhone using iMovie.

merge flv

Step 6: To export your merged video file, tap the Share icon to save the video.

2 Ways to Merge/Combine FLV Files Online

Clideo (Paid online tool to merge FLV Files)

Now you can combine your FLV files online using Clideo's FLV Merger. It allows you to combine several videos, images, and audio files. You will also be able to download the finished product in any format you want. And, as the tool operates online, it will not consume any of your device's memory. Each file you add in the free edition can be up to 500 MB in size; if this is insufficient for you, you can always subscribe to Clideo Pro.

A Step-by-Step Guide

Step 1: Upload the FLV files…

Click on the "Choose files" button and select the necessary videos from your device. To add a video from Google Drive or Dropbox, use the little arrow to call a drop-down menu.

Step 2: Merge FLV and other files

To add more content, use the menu with all of the options from the previous stage. Rearrange them as you see fit. Crop the frame using one of the available aspect ratios. Upload a soundtrack, then cut it with the scissors icon and adjust the volume. When you're done, choose a format and click "Merge."

Step 3: Save joined FLV

Take a peek at the outcome. If you like it, save it to your device or cloud storage. Otherwise, you can return to editing without having to start over.

Veed’s Video Editor (Free online tool to merge FLV Files)

Now there’s no need to pay for expensive apps like Filmora or Wondershare Uniconvertor. You can merge your FLV files using Veed’s Video Editor. It lets you combine multiple flash videos together and export them as a single video file. You can simply do it all straight from your browser and from any device. Veed’s Video Editor is compatible with Windows XP, Windows 10, Mac, Linux, and all mobile devices. And, it is absolutely free. There’s no need for an account or to download anything.

A Step-by-Step Guide

Step 1: Upload the FLV files…

Select multiple FLV videos after clicking on ‘Choose FLV Files’. You can also drag and drop your videos into the box. They'll be added to the editor.

Step 2: Start editing or add more videos…

You'll be directed to the video editor, where you can split, combine, and rearrange your video clips. This is a purely optional step. More videos can be added by clicking the plus (+) sign in the editing window or by selecting “Upload” from the left menu.

Step 3: Export your new video…

You can now save your merged videos as a single MP4 file. Simply select 'Export,' and your download will initiate.

FAQs about Merging FLV Files

Question 1: How to combine FLV files?

Answer: To combine FLV files, hold down the Ctrl or Shift key while selecting multiple FLV files in the User's Album, and then drag and drop to the video track on the Timeline. All FLV files will automatically merge one after the other in order.

Question 2: What browser should be used to Merge FLV?

Answer: You can use any modern browser to Merge FLV, such as Google Chrome, Firefox, Opera, or Safari.

Question 3: How long does it take to Merge FLV files?

Answer: The FLV file merger is quite quick and takes only a few seconds.

So, if you have been looking for the best options on how to merge FLV files on different mediums, the above-listed apps will serve your purpose. Now, check out the supported features, formats, and other merging functions of all the apps and choose the one that best meets your needs.

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