Video & Audio Converter
Free online video and audio converter. Convert MP4, MOV, WebM, MKV, AVI and turn video into GIF, or convert audio between MP3, WAV, OGG, M4A and AAC — all in your browser with no upload. Powered by FFmpeg compiled to WebAssembly.
Drop a video or audio file
or click to choose · MP4, MOV, WebM, MKV, AVI, MP3, WAV, M4A — converted in your browser
How to use the Video & Audio Converter
- 1Open the tool and drag your video or audio file onto the drop zone, or click to browse and select it from your device — nothing uploads, the file just loads into the page.
- 2Pick your target format from the output menu: for video choose MP4, MOV, WebM, MKV, AVI or GIF; for audio choose MP3, WAV, OGG, M4A or AAC.
- 3Adjust any available options for your chosen format, such as GIF frame rate or width, or the audio bitrate, to balance quality against file size.
- 4Click Convert and watch the progress indicator — FFmpeg runs in WebAssembly right in your browser, so the wait depends on your computer, not your internet speed.
- 5When it finishes, click Download to save the converted file locally, then load another file to convert the next one.
About the Video & Audio Converter
The Video and Audio Converter turns your browser into a self-contained media transcoding station. It runs FFmpeg compiled to WebAssembly, which means the entire conversion happens locally on your own machine — your files are never uploaded to any server, never leave your device, and never touch someone else's storage. When you drop a file in, the WebAssembly build of FFmpeg loads into a background worker and processes the bytes right there in the tab. For video it reads and writes MP4, MOV, WebM, MKV and AVI, and it can also flatten a short clip into an animated GIF. For audio it moves freely between MP3, WAV, OGG, M4A and AAC. This matters in real situations: you have a MOV from an iPhone that a Windows app refuses to open, a bulky MKV screen recording you need as a lighter MP4, a WAV voice memo a form only accepts as MP3, or a two-second reaction clip you want as a shareable GIF. Journalists, podcasters, teachers, students and developers all hit these format walls, and normally the fix is either bloated desktop software or an upload site that keeps your data. Here you get neither problem. Because processing is client-side, there is no file-size cap imposed by an upload limit — the practical ceiling is your device's memory, so trimming or converting one clip at a time is smarter than feeding it a feature-length film. A few practical tips: choose the container that matches where the file is going (MP4/AAC for broad compatibility, WebM for the open web, WAV when you need lossless audio), and expect GIFs to balloon in size, so keep them short and small. Everything works offline once the page has loaded, which is genuinely useful on a plane or a locked-down network. The value is simple: fast, private, install-free format conversion that respects your files.
Frequently asked questions
Why does the page seem to work without any internet connection?
Because all the conversion logic — the FFmpeg WebAssembly engine — is downloaded to your browser when the page first loads and then runs entirely on your device. After that initial load, no network is needed to convert files, so it keeps working on a plane, on spotty Wi-Fi, or on a restricted network.
Is there a limit on how big my file can be?
There is no server-imposed upload cap because nothing is uploaded. The real limit is your device's available memory, since the whole file is processed in the tab. Short clips and audio files convert comfortably; very large multi-gigabyte videos may run slowly or run out of memory, so convert one file at a time and trim long recordings first.
Why is my converted GIF so much larger than the original video?
GIF is an old format that stores frames without modern video compression, so even a few seconds can be several megabytes. To keep the size down, convert only a short segment and reduce the frame rate and pixel width in the GIF options. For anything longer, WebM or MP4 will be dramatically smaller.
Will converting between MP3, AAC and other lossy formats hurt the quality?
Converting from a lossy source (like MP3) into another lossy format (like AAC or OGG) re-compresses already-compressed audio and can add a small quality loss. Converting to WAV is lossless but produces a much bigger file. For the cleanest result, convert from your original, highest-quality source rather than from a file that was already compressed.
Can it convert a video file into just an audio file, like pulling MP3 out of an MP4?
Yes. Load the video and choose an audio format such as MP3, WAV, M4A or AAC as the output. FFmpeg extracts and re-encodes just the audio track and gives you an audio-only file, which is handy for turning a recorded talk or video call into a podcast-style file.
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Frequently asked questions
Is the video converter free and private?+
Yes. It runs entirely in your browser using FFmpeg (WebAssembly) — your files are never uploaded to a server, and there are no limits or watermarks.
What can I convert?+
Video: MP4, MOV, WebM, MKV, AVI and video-to-GIF. Audio: MP3, WAV, OGG, M4A, AAC, and extracting audio from any video.
Why is the first conversion slow?+
The first run downloads the FFmpeg engine (~30 MB) once, then it's cached. Conversions run on your device, so large videos take longer than a GPU server would.