WEBM to FLV | Fast & Free & Secure
Convert WEBM to FLV online in seconds. No signup. Secure processing; files auto-delete in ~2h. Works on mobile & desktop.
Smart Auto-Detection – ConvertSea
No need to select your file type — we've already detected it.
Just upload your file and choose the format you want to convert it to. Our system automatically recognizes the input format, so you can focus on getting the output you need.
What is WebM?
WebM is an open, royalty-free multimedia container designed for the web. A .webm file is a Matroska-derived package that typically carries VP8, VP9, or AV1 video with Vorbis or Opus audio, plus timing and metadata. Compared with legacy MP4/H.264, WebM often delivers smaller files at similar visual quality, especially with VP9 or AV1, which excel at streaming and high resolutions. WebM plays natively in modern browsers and HTML5 video without plugins, making it ideal for websites, social platforms, and app interfaces. It also supports alpha transparency and efficient looping, so creators frequently use WebM as a lightweight replacement for animated GIFs. For broad compatibility, many workflows export both MP4 (H.264/AAC) and WebM, letting each device or browser select the best option.
What is FLV?
FLV (Flash Video) is a legacy multimedia container designed for delivery through Adobe Flash Player and RTMP streaming. A .flv file stores media as sequential “tags,” typically carrying H.263/Sorenson Spark or On2 VP6 video in older files and H.264/AVC in later ones, with MP3 or AAC audio. It also embeds timing metadata and cue points for web playback and simple interactivity. Because Flash reached end-of-life in 2020 and browsers removed the plug-in, FLV is now mainly used when converting archival content. Most modern players—VLC, mpv—and tools like FFmpeg can open and transcode FLV, but MP4 (H.264/AAC) or WebM (VP9/Opus) are preferred for size, compatibility, and HTML5 streaming. If you have FLV files, consider remuxing or re-encoding to MP4, and delivering via HLS or DASH.
Upload Your File
Upload your file (drag & drop or click). Input type is auto-detected—no need to choose it.
Pick Format & Options
Pick the output format and (if available) adjust options like OCR, quality, bitrate, or resolution.
Convert & Download
Convert & download your file. Rate us.
Convert Your Files Instantly – Fast, Secure & Free
Welcome to ConvertSea, the ultimate online tool to convert your files with speed, accuracy, and zero hassle. Whether you're changing image formats, converting videos, editing documents, or extracting audio, our platform delivers instant, high-quality results across hundreds of file types.
No downloads, no registration, and no watermarks — just upload your file, choose the format you need, and download your converted file in seconds.
From PDF to Word, MP3 to WAV, JPG to PNG, or MP4 to MOV, ConvertSea ensures that your content stays clean, secure, and exactly how you want it.