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How to Convert MP4 to FLV?
Follow these simple steps to convert MP4 files to FLV in seconds:
Upload
Select or drag your MP4 file to our online MP4 to FLV converter.

Convert
Click the “Convert” button and let our tool transform your .mp4 file to .flv in seconds.

Download
Save your newly converted FLV file to your device, ready to stream or share.

What is MP4?
MP4, or MPEG-4 Part 14, is a widely used digital multimedia container format designed to store video, audio, subtitles, and still images. It supports high-quality video compression using codecs like H.264 or H.265 and audio formats such as AAC or MP3. MP4 files are compatible with nearly all devices and platforms, including smartphones, computers, web browsers, and media players, making it one of the most versatile and accessible video formats available. Unlike M4V, MP4 typically does not include DRM protection, allowing for broader sharing and playback flexibility.
What is FLV?
FLV (Flash Video) is a container file format used to deliver digital video content over the internet using Adobe Flash Player. It was widely used in the early days of online video streaming, especially on platforms like YouTube and Twitch. However, FLV is less compatible with modern devices and browsers compared to MP4, which is why converting MP4 to FLV is sometimes needed for legacy systems or specific use cases.
MP4 vs. FLV
MP4 vs. FLV—let’s see which is better! Here's a detailed comparison:
Features
FLV
- File Extension
- .flv No
- Developer
- Adobe Systems No
- Compression
- Uses Sorenson Spark and VP6 codecs, less efficient compression No
- Quality
- Good quality but generally lower than MP4 No
- Video Codec Support
- Sorenson Spark, VP6, H.264 (later versions) No
- Audio Codec Support
- MP3, AAC No
- Streaming Support
- Originally designed for streaming via Adobe Flash No
- Compatibility
- Limited support; deprecated due to Flash’s end-of-life No
- Use Cases
- Legacy web streaming, older video platforms No
MP4
- File Extension
- .mp4 No
- Developer
- Moving Picture Experts Group (MPEG) No
- Compression
- Efficient compression with high quality and smaller file sizes No
- Quality
- Supports HD and 4K video quality No
- Video Codec Support
- H.264, H.265 (HEVC), MPEG-4, VP9, AV1 No
- Audio Codec Support
- AAC, MP3, AC3, Opus No
- Streaming Support
- Widely used for streaming on all devices No
- Compatibility
- Universal support across devices and platforms No
- Use Cases
- Web videos, mobile playback, streaming, editing No
Why Choose our MP4 to FLV Converter?
100% Free and Online
Convert MP4 files to FLV without software installation.
Fast Conversion
Our powerful servers ensure quick results every time.
High-Quality Output
Preserve video quality while optimizing file size.
Device Compatibility
Works seamlessly on desktops, tablets, and mobile devices.
Secure and Private
Your files are safe with us—deleted automatically after conversion.
Cloud-Based Convenience
No software downloads or installations needed.
Start Streaming with Gumlet
Once you've converted your MP4 file to FLV, why stop there? Gumlet helps you host, secure, and stream your videos effortlessly. Simply, follow the steps below:
Video Upload
Automate video uploads from your device or cloud storage at scale with integrations and APIs. Upload multiple videos in parallel without getting stuck in upload queues.

Video Processing
Enjoy instant video start times, exceptional quality, and buffer-free streaming. Generate unlimited subtitles in multiple languages and optimize your streaming with latest codecs.

Video Sharing
Generate playback URLs instantly and embed codes for easy publishing. Our global Multi-CDN network ensures super-responsive video streaming with instant start times every time.







