Convert Video in your browser
— MP4, WebM, MOV, MKV & MP3
Change format or pull out the audio. Your file never leaves your device — no upload wait, no watermark, no signup, no size limit. WebM → MP4, MOV → MP4, MKV → MP4, video → MP3 and more.
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How it works
Three steps, zero uploads.
Drop in any MP4, MOV, WebM, MKV or AVI — even a 1GB screen recording or phone video.
MP4 for compatibility, WebM for the web, MOV/MKV for editing — or MP3/M4A/WAV to keep just the audio.
Your device's own hardware encoder does the work — usually faster than an upload would even take.
WebM to MP4, MOV to MP4, MKV to MP4 — without uploading
Screen recorders love WebM, iPhones shoot MOV, and downloads often arrive as MKV — but the rest of the world wants MP4 with H.264. This converter re-encodes on your own device with hardware acceleration, so a file that would take 20 minutes to upload elsewhere converts in a couple of minutes, privately. It also goes the other way: turn heavy MP4s into small, modern WebM for websites.
Extract MP3 audio from any video
Need just the sound — a lecture, a podcast clip, a song from a recording? Pick MP3, M4A or lossless WAV and the video track is discarded on your device; only the audio is encoded and downloaded. No upload, no watermark, no length limit.
WebM to MP4, MOV to MP4, MKV to MP4 — for when compatibility wins
MP4 (H.264) is still the format that plays everywhere: every phone, every editor, every upload form. Browser screen recorders save WebM, iPhones shoot MOV, and OBS records MKV — and sooner or later something refuses to accept them. Drop the file here and convert it to MP4 on your own device: no upload queue, no watermark, and large files are no problem because they never leave your machine. Going the other way works too — MP4 to WebM for smaller web embeds, or into MKV/MOV containers for editing workflows.
Extract MP3 audio from any video
Need just the sound? Choose an audio-only output — MP3 for maximum compatibility, M4A for quality at small sizes, or WAV for uncompressed editing — and the video track is dropped entirely. Turn a recorded lecture into a listenable file, pull a song cover out of a performance video, or grab interview audio for transcription. Because extraction happens locally, pulling audio out of a 1GB recording is fast and completely private.
Frequently asked questions
How do I convert WebM to MP4 without uploading it?
Drop the WebM file on this page, pick MP4, and press Convert. The conversion runs in your browser using your own hardware — nothing is sent to a server, so large files convert as easily as small ones.
Can I extract just the MP3 audio from a video?
Yes. Choose MP3 (or M4A/WAV) as the output and the video track is discarded — you get a clean audio file, extracted entirely on your device.
Is my video uploaded to a server?
No. Conversion happens entirely inside your browser on your device's own hardware. You can watch the network tab: after the page loads, nothing is sent anywhere.
How do I convert WebM or MKV to MP4?
Drop the file in, keep MP4 selected, press Convert. You get a standard H.264 + AAC MP4 that plays everywhere.
Can I extract MP3 audio?
Yes — choose MP3 (or M4A/WAV). The video track is discarded and only the audio is encoded, on your own device.
Is there a file size limit?
No hard limit. The file is streamed piece by piece, so 500MB–1GB+ works on a modern desktop. A desktop is recommended for 1GB+.
Which browsers work?
Chrome, Edge and Opera (desktop + Android) and Firefox 130+ are fully supported. Recent Safari versions work as well; older Safari may not support some codecs and the tool will tell you.