Free MP4 FLV to Converter Online

Fast, Free, Secure & Simple

How to Convert MP4 to FLV

Convert MP4 into FLV for legacy Flash workflows.

Upload your MP4 file
Click Upload and select your MP4 file from your device.
Confirm FLV as output
The FLV format is auto-selected for this page—confirm it (or choose if needed). Only use if a platform specifically needs FLV.
Convert and download
Click Convert Now and download your FLV file. Confirm playback in the platform that requires FLV. Note: Flash is deprecated in modern browsers.

💡 Example: Upload an MP4 training video as FLV to an older LMS.

Looking for a fast and reliable way to convert MP4 to FLV online for free? You've come to the right place. Change My File is the best MP4 to FLV converter that makes it incredibly easy to turn your MP4 video files into FLV format in just a few clicks—without installing any software.

Whether you're a content creator, web developer, or someone looking to compress video files, our free MP4 to FLV converter is your go-to tool for quick and secure conversions.

Why Convert MP4 to FLV?

MP4 is a universal format, but FLV (Flash Video Format) is still widely used for embedding videos on websites due to its smaller file size and faster load times. If you’re uploading videos to platforms that support FLV or need optimized videos for older flash-based players, our online MP4 to FLV converter is exactly what you need.

How to Convert MP4 to FLV for Free

Upload your MP4 file using the “Choose File” button.
Our tool will quickly process and convert your video.
Download the FLV file instantly—no sign-up, no watermark.

100% free. No software download. Works on all devices.

Features of Our Free MP4 to FLV Converter

Free MP4 to FLV conversion online
No watermark on your converted videos
Fast and secure file processing
Supports HD and large file uploads
No software installation required
Mobile and desktop compatible

Who Needs an MP4 to FLV Converter?

YouTubers & Creators looking to convert videos for specific platforms
Webmasters embedding lightweight videos on websites
Developers optimizing videos for legacy systems
Educators & Marketers sharing compressed video content

Whether you’re converting a tutorial, a short film, or a promotional clip, our MP4 to FLV online converter handles it all—quickly and effortlessly.

Safe & Secure MP4 to FLV Conversion

Your privacy matters. All files uploaded to our server are automatically deleted after conversion. Your content is never shared or stored.

Convert MP4 to FLV Online – Anytime, Anywhere

There’s no limit to how many files you can convert. Use our free MP4 to FLV converter online anytime, from any device—Windows, Mac, Android, or iPhone.

File extension	.mp4
File category	Video
Stands for	MPEG-4 Video stream
Developer	Moving Picture Experts Group
Overview	It stores multimedia data. It is commonly used by manufacturers (those produce mobile products) as well as by Apple for audio, video and still images. It offers higher flexibility and is compatible with both audio and video files. The Format provided by these files i.e MPEG-4 is commonly used online for streaming the videos. Any Movie, video or Audio file can be easily downloaded or streamed online with this extension which can be free or chargeable as well, such as downloading from iTunes. The payment can be made using credit or debit cards. These files may also include audio books, photos, podcasts, songs, movies, not making them limited to just audios and videos. This format has become more common as they are being used in iPod and PlayStation Portable(PSP). Commonly portable media players are advertised as “MP4 players” although they are capable of playing other media format as well like ‘AMV format'.
Technical description	MPEG-4 files are officially named under extension .mp4 and this is the only official extension for MPEG-4 PART-14 formats. These files were introduced in 2001 under the standards of ISO/IEX 14496-1:2001. It runs on AAC encoding which restricts the users from copying the data of the files. The data embedding can be done on these files using any private stream. For instance, hint tracks to add the streaming information into the file. These files are similar to most of the modern containers containing data information which allows internet streaming.
Links	wikipedia.org (opens in new tab - official documentation)

File extension	.flv
File category	Video
Stands for	Flash Video
Developer	Adobe Systems (initially developed by Macromedia)
Overview	It is a multimedia container file format which is used over the internet to provide digital video content to the users. Digital video content includes TV shows or series, movies; etc. Adobe Flash Player 6 and new versions provide support to it. To play flash video from Personal Computer and online websites we need an FLV player. Although, Apple iOS does not support Flash, yet, with the help of additional software, one can play flash videos. Also, it is a common platform for various websites that allows video streaming such as YouTube, Yahoo! Video, Metacafe, Hulu; etc . With the help of screen capturing and other recording programs, screen recording is possible for flash videos. Furthermore, it also supports a screen share or screen cast.
Technical description	FLV files mostly have video bitstreams which are one of the variants of H.263 Standard and it is named as Sorenson park(FourCC FLV1). The SWF files and this extension uses the identical way to encode data. There are two variants available for screen casting. First one is lossy as it reduces colour depth or bit depth (number of bits used to indicate the colour of one pixel) and compresses the data. The second type is only compatible with Flash Player 8 and the newer versions. Both these aforesaid kinds are based on bitmap tile. Uncompressed Audio or ADPCM format audio is also supported by it. This format has header and packets in its video structure. A standard header includes signature, version, flags and header size.
Links	wikipedia.org (opens in new tab - official documentation)

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