What is FLV?
Flash Video
FLV was the dominant format for web video during the Adobe Flash era. While Flash is deprecated, FLV files still exist in many legacy systems and require conversion to modern formats for playback.
History of FLV
FLV (Flash Video) emerged in the early 2000s and dominated online video during the Adobe Flash era — YouTube originally streamed in FLV. When Flash was deprecated (formally in 2020), FLV lost its primary use case. Files in this format usually need to be converted to MP4 or WebM for modern playback.
Technical specs
- Format name
- Flash Video
- File extension
- .flv
- MIME type
- video/x-flv
- Category
- Video
- Compression
- Compressed
When to use FLV
Reach for FLV when you need converting legacy flash content, recovering old web archives, maintaining older streaming systems. It excels at these scenarios because small file sizes and once-universal web compatibility.
Pros
- +Small file sizes
- +Once-universal web compatibility
When to avoid FLV
Avoid FLV when adobe flash is deprecated, and no modern browser support. In those cases, look at the alternatives below.
Cons
- −Adobe Flash is deprecated
- −No modern browser support
- −Should be converted to MP4 or WebM
Common uses for FLV
- Converting legacy Flash content
- Recovering old web archives
- Maintaining older streaming systems
Alternatives to FLV
FLV should be converted to MP4 or WebM as soon as possible — Flash is no longer supported anywhere.
FLV — Frequently Asked Questions
Is FLV still used in 2026?
Is FLV still used in 2026?
Not really — FLV is a legacy format from the Adobe Flash era, which ended in 2020. Most existing FLV files should be converted to MP4 or WebM for modern playback. New content is rarely produced in FLV.
Can I open a FLV file on my phone?
Can I open a FLV file on my phone?
No modern phone plays FLV without a third-party app. Convert to MP4 for any current device.
Why is my FLV file so small?
Why is my FLV file so small?
FLV files are usually compact because the format uses efficient compression. If yours feels unusually large, the encoder may have been set to a high bitrate / quality setting.
Can I convert FLV to another format for free?
Can I convert FLV to another format for free?
Yes — Zen Convert converts FLV files to every other video format we support, for free, in your browser. No signup, no watermark.
Is FLV open-source?
Is FLV open-source?
FLV's container spec was opened by Adobe, but it's effectively obsolete.