Free Online FLV Converter — Convert Flash Video Files
Convert FLV (Flash Video) files to MP4, AVI, MOV, and modern formats. FLV was the standard for web video before HTML5 — convert to MP4 for universal playback.
Max file size 50MB. Sign up for more.
| File Name | Size | Convert To |
|---|
Checking files and selected output formats.
| File Name | File Size | Download |
|---|
How to Convert FLV Files Online — Free & Instant
Convert legacy Flash Video files to modern formats since Flash Player is no longer supported.
Drag and drop FLV files saved from the Flash era — old YouTube downloads, web animations, or archived content. The converter reads both FLV1 (Sorenson Spark) and VP6 encoded Flash Video.
Select MP4 for universal playback since no modern browser supports Flash. Choose WebM for open-source web use, or MOV for Apple device playback. The video is re-encoded with H.264 for modern compatibility.
Download your converted video file that plays in any modern browser or media player. No Flash Player required. Audio is converted from legacy MP3/Nellymoser to AAC.
Video Format Comparison
Choose the right output format when converting FLV video files.
| Format | Compression | File Size | Compatibility | Best For |
|---|---|---|---|---|
| MP4 | H.264/H.265 | Small–medium | ✅ Universal | Sharing, streaming, social media |
| MOV | H.264/ProRes | Medium–large | ✅ Apple, QuickTime | Mac editing, iPhone recordings |
| MKV | Multiple codecs | Large | ✅ PC, media players | High-quality archiving, subtitles |
| WebM | VP8/VP9 | Small | ✅ Web browsers | Web embedding, HTML5 video |
| AVI | Various | Large | ✅ Windows, legacy devices | Legacy compatibility, editing |
Why Convert FLV Videos?
Adobe discontinued Flash Player in December 2020, and no modern browser supports it. FLV files are unplayable in browsers and most applications. Convert to MP4 to watch your FLV content again.
Old YouTube downloads, web tutorials, and Flash-era video archives saved as FLV are at risk of becoming inaccessible. Convert FLV to MP4 to preserve these videos in a modern, future-proof format.
No smartphone, tablet, or smart TV supports FLV playback. Convert FLV to MP4 for instant compatibility with iPhone, Android, Roku, Apple TV, and every modern media player.
YouTube, Vimeo, TikTok, and all social platforms reject FLV uploads. Convert FLV to MP4 before uploading to ensure your legacy video content can be shared on today's platforms.
FLV used early codecs (Sorenson Spark, VP6) with poor compression. Convert to MP4 with H.264 for significantly smaller files at the same or better visual quality.
Convert FLV video directly in your browser — no desktop apps, no plugins. Files up to 10 MB are always free, and all videos are deleted from our servers within 24 hours.
Related Guides for Free Online FLV Converter — Convert Flash Video Files
Read format guides, compatibility fixes, and practical workflows related to Free Online FLV Converter — Convert Flash Video Files.
How to Convert FLV to MP4: Fix Flash Video Files in 2026
FLV files won't play on modern devices. This guide shows you how to convert Flash Video to MP4 using free online and desktop tools — preserving quality and fixing compatibility issues.
How to Compress Files for Email Attachments (Under the Limit)
Email attachment too large? This guide shows you how to compress photos, documents, and videos to fit within Gmail (25MB), Outlook (20MB), and Yahoo Mail (25MB) limits — using free tools.
Video File Formats Explained: The Complete Conversion Guide
The complete guide to video file formats — MP4, MKV, AVI, MOV, WebM, FLV, and WMV explained. Understand the difference between containers and codecs, and learn which format works best for streaming, editing, and sharing.
H.264 vs H.265 (HEVC) vs AV1: Video Codecs Explained
A jargon-free explanation of the three most important video codecs — H.264, H.265 (HEVC), and AV1. Compare compression, quality, device support, and learn which codec fits your needs.
How to Convert MOV to MP4 — iPhone Videos, Free Online (2026)
MOV files from iPhone or QuickTime won't play everywhere. Convert MOV to MP4 online for free — works on any device, no software needed.
How to Compress a Video for Free Online — MP4, MOV, AVI, WebM
Video too large to send or upload? Compress it online for free. Reduce MP4, MOV, AVI, and WebM file size without watermarks. Choose quality and resolution.