Convert FLV to MP4 OnlineVIDEO
Extract and convert legacy Flash FLV video to modern H.264 MP4. 100% client-side WebAssembly processing with zero server uploads and complete privacy.
Drop any Video, Image, Audio, or PDF
100% In-Browser & Sovereign • Zero Cloud Egress
Unable to read this file
The file could not be parsed. It may be corrupted, password-protected, or in an unsupported format.
Removes GPS coordinates, device serial numbers, camera model, and timestamps from JPEG/PNG headers before compression.
ENCODING PARAMETERS
Why Convert FLV to MP4 Client-Side?
3-Step FLV to MP4 Conversion Guide
Select FLV File
Drag and drop your FLV file into the universal media zone or browse your device.
Configure Settings
Adjust output quality (CRF), target file size, or resolution if desired.
Download MP4
Click Start Compression and download your converted MP4 file instantly.
Frequently Asked Questions
Is converting FLV to MP4 safe and private?
Yes, 100%. All processing occurs locally inside your browser using WebAssembly. Your file is never uploaded to any remote server.
Do I need to install any software?
No installation or browser extensions required. It runs purely on modern web standards inside Chrome, Edge, Safari, and Firefox.
Will converting to MP4 reduce quality?
Our converter uses advanced codecs with customizable CRF (Constant Rate Factor) settings so you can achieve visually lossless results.