FLV to MP4 Converter

Resurrect your dead Flash videos by converting FLV to MP4.

4.6/5 - 980 votes

Drag & Drop FLV files here

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How to Convert FLV to MP4?

Resurrect your Flash videos and make them playable again.

1

Upload FLV

Drag & drop your old .flv file. We support all common Flash codecs.

2

Convert

We decode the legacy stream and re-encode it to the modern H.264 standard.

3

Download

Save your new MP4. It is now safe, compatible, and ready for the future.

Why convert FLV?

Adobe officially killed Flash Player in 2020. FLV files do not work in Chrome, Safari, or on mobile devices anymore. Converting to MP4 is the only way to view them.

Engineering Philosophy

Adobe Flash is Dead.
Long Live Your Video.

For over a decade, FLV (Flash Video) powered the internet. It was the backbone of early YouTube and countless other video sites.

But with the "Death of Flash" in 2020, browsers stopped supporting it. Millions of FLV files became unplayable overnight—digital memories locked in an obsolete container.

RiseConvert's FLV Restoration Engine is efficient archeology. We extract the raw video streams (often Sorenson Spark or VP6) from the FLV container and re-encode them into modern, standards-compliant H.264 MP4 files that work on any screen today.

Preserve internet history

Recover Memories

Make unplayable Flash files viewable again.

Fix Sync

Corrects timestamp issues common in old FLV streams.

Universal Standard

Play on iPhone, HTML5, & Smart TVs

Understanding FLV (Flash Video)

FLV was the container format used by Adobe Flash Player to deliver video over the internet. It was designed for a different era, prioritizing low bandwidth over quality.

Since the deprecation of Flash, FLV has become a "zombie format." The video data is still inside, but modern software doesn't know how to render it properly.

MP4 is the universal replacement. By converting FLV to MP4, you are essentially saving the video from digital obsolescence.

Format Status

Feature
FLV (Obsolete)
MP4 (Modern)
Status
Discontinued (2020)
Active Standard
Browser Support
0% (Plugins required)
100% (Native)
Mobile Playback
Impossible
Native
Codecs
Sorenson Spark, VP6
H.264, H.265
File Size
Medium
Small & Efficient

The Problem with Legacy Codecs

FLV files often used a codec called Sorenson Spark (H.263) or On2 VP6. These are ancient by modern standards. Even if you could open the container, your modern video player might show a black screen or green artifacts.

RiseConvert doesn't just change the file extension. We perform a full transcode, decoding the old, inefficient frames and re-drawing them using the high-efficiency H.264 standard. This ensures the video looks correct on iPhones, Androids, and 4K TVs.

Tech Glossary

Flash Player

The browser plugin that used to play FLV files. It was disabled globally in 2020 due to security risks.

Sorenson Spark

An old video compression standard found in early FLV files. It is rarely supported today.

Transcode

The process of converting video from one encoding format (FLV) to another (MP4).

Container

The file format that holds video/audio. FLV is an old container; MP4 is the modern one.

Common Issues & Solutions

Alpha Channel (Transparency)?

Some FLV files used transparent backgrounds. MP4 does not support this. The transparent areas will become black in the converted file.

Low Resolution?

Old FLV videos were often 240p or 360p. Converting to MP4 preserves quality but cannot magically create new details (upscale) that weren't there.

Variable Frame Rate?

FLV often had unstable frame rates. Our converter stabilizes this to a constant frame rate for smoother playback on modern screens.

Tool Specs
Input.FLV (Flash)
Output.MP4 (H.264)
ProcessingDeep Transcode
Privacy Encrypted

Secure Processing

Files are processed in a secure environment and automatically deleted after 2 hours.

User Feedback

"Found an old hard drive with 2008-era FLV videos. This saved them all!"

M
Mark T.
Archivist

"Great for converting old portfolio work that was locked in Flash format."

J
Jessica L.
Designer

Frequently Asked Questions

What is FLV?
FLV stands for Flash Video. It was the standard for web video until 2010 but is now obsolete and unsupported by modern browsers.
Can I install Flash Player to play them?
No. Adobe has discontinued Flash Player and actively blocks it from running. Converting to MP4 is the safe solution.
Will the video quality improve?
No converter can improve the quality of the original file, but we use high-quality encoding to ensure no further quality is lost.
Does this work on Mac?
Yes! Since Macs (and QuickTime) do not support FLV natively, this tool is perfect for Mac users.