convertuno

Convert video to MP4 — or extract MP3

Drop any video. Compatible files are repackaged losslessly in seconds; the rest are hardware-converted at high quality — all without leaving your device.

Drop your video or audio here

or

MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload

Convert to
Plays everywhere — TVs, phones, chat apps

🔒 Files never leave your device — everything runs in your browser.

How it works

  1. Drop your file

    Any common video or audio format, any size. Nothing is uploaded.

  2. Pick MP4 or MP3

    MP4 plays everywhere; MP3 extracts just the audio track.

  3. Download

    Instant for compatible files, hardware-fast for the rest.

Frequently asked questions

Why are some conversions instant?

Many files (most MKV and MOV videos) already contain MP4-compatible video. ConvertUno detects this and simply repackages the streams without re-encoding — a lossless remux that takes seconds even for huge files. You will see a badge on the result when it happens.

Which formats can I convert?

Input: MP4, MOV, WebM, MKV — plus legacy formats (AVI, FLV, WMV, 3GP, MPG) via the built-in software decoder — and audio files (MP3, WAV, M4A, FLAC, OGG). Output: MP4 (H.264 + AAC — plays everywhere), GIF, or audio formats.

Is my file uploaded to a server?

No. Conversion runs entirely in your browser on your own device — there is no upload, no queue, and no server holding your files.

Is there a file size or usage limit?

None. Because your device does the work, we have no server costs to protect — no size cap, no daily quota, no signup, no watermark.

Will converting reduce my video quality?

Lossless remuxes change nothing at all. When a real re-encode is needed (e.g. WebM to MP4), it runs at a high-quality setting on your video hardware — visually faithful for normal viewing. If you also need a specific file size, use the compressor instead.

Popular conversions

  • Convert 3GP to MP4Convert 3GP phone videos to MP4 in your browser — free, private, no upload. Bring clips from old feature phones back to playable life.
  • Convert AVI to MP4Convert old AVI videos to MP4 in your browser — free, private, no upload. Bring camcorder footage and legacy files into the modern world.
  • Convert FLAC to MP3Convert FLAC to MP3 in your browser — free, private, no upload, no size limit. Make your lossless library playable on everything you own.
  • Convert FLV to MP4Convert FLV (Flash video) to MP4 in your browser — free, private, no upload. Rescue clips from the Flash era into a format that plays anywhere.
  • Convert M4A to MP3Convert M4A audio to MP3 in your browser — free, private, no upload. Voice memos, iTunes tracks, and recordings become universally playable.
  • Convert MKV to MP4Convert MKV files to MP4 in your browser — free, private, no upload, no size limit. Most MKVs convert instantly with zero quality loss (no re-encode).
  • Convert MOV to GIFTurn iPhone MOV clips into animated GIFs in your browser — free, private, no upload. Your moment becomes a loop that plays absolutely everywhere.
  • Convert MOV to MP4Convert iPhone and Mac MOV files to MP4 in your browser — free, private, no upload. Standard recordings convert losslessly in seconds.
  • Convert MP3 to WAVConvert MP3 to uncompressed WAV in your browser — free, private, no upload. The format editors, DAWs, and audio tools expect.
  • Convert MP4 to GIFTurn MP4 clips into animated GIFs right in your browser — free, private, no upload, no watermark. Tuned for crisp, postable GIFs that loop anywhere.
  • Convert MP4 to MP3Turn any MP4 video into an MP3 audio file right in your browser — free, private, no upload, no size limit. Perfect for music, lectures, and podcasts.
  • Convert MPG to MP4Convert MPG/MPEG videos to MP4 in your browser — free, private, no upload. DVD rips and early digital camera clips, modernized on your device.
  • Convert OGG to MP3Convert OGG audio files to MP3 in your browser — free, private, no upload. Game sounds, downloads, and voice clips become playable anywhere.
  • Extract MP3 audio from videoExtract MP3 audio from any video right in your browser — free, private, no upload, no size limit. Works with MP4, MOV, WebM, MKV and more.
  • Convert WAV to MP3Convert WAV files to MP3 in your browser — free, private, no upload, no size limit. Shrink recordings to a tenth of the size at high quality.
  • Convert WebM to GIFTurn WebM recordings into animated GIFs in your browser — free, private, no upload. Perfect for screen captures headed to docs, issues, and chats.
  • Convert WebM to MP4Convert WebM to MP4 right in your browser — free, private, no upload, no size limit. Hardware-accelerated conversion for screen recordings and clips.
  • Convert WMV to MP4Convert WMV to MP4 in your browser — free, private, no upload. Make old Windows videos play on phones, Macs, TVs and the modern web.

Need a specific file size instead? Use thevideo compressor — it fits any video under an exact limit, guaranteed.