Flash Video (FLV) is an obsolete format from the Adobe Flash era. With Flash now dead, FLV files need to be converted to play in modern browsers and on mobile devices. Converting to H.264 MP4 is the simplest solution.
Convert old Flash Video (FLV) files to H.264 MP4 for modern playback.
You’ve tried our free online encoder — but if you need larger files, bulk jobs, or enterprise-grade throughput, Convertrilo has you covered. GPU-powered encoding, predictable pricing, and instant scaling when you need it most.
Upload your FLV (Flash Video) file using the tool above, make sure the output codec is set to H264 and the container to MP4, then click Convert. No software installation required — encoding runs on our GPU servers.
Yes. No sign-up is required for the free tool. You get up to 720p output and files up to 200 MB. Create a free account to unlock 1080p, larger files, and 1,000 free encoding minutes.
Encoding speed depends on file length and selected resolution. Most short clips (under 5 minutes) finish in under 60 seconds on our GPU infrastructure.
H.264 (AVC) is a modern video codec with broad compatibility across virtually all devices and platforms. Converting to MP4 (H.264) is ideal for maximum device compatibility — every TV, phone, browser and player supports H.264.
Yes. By default the tool re-encodes audio to AAC at 192 kbps for MP4/MKV/MOV, or Opus at 128 kbps for WebM. You can also choose to copy the original audio stream unchanged or strip it entirely using the Audio selector.