Convert any file, nothing uploaded
Free tools

Free tool

Free M4V to MP4 converter, no upload

Convert M4V to MP4 in your browser, in seconds.

Your video

Drag a file here, paste it, or choose one.

.m4v, .mp4, .mov, .mkv, .webm, .avi, .wmv, .flv, .3gp, .gif. Up to 500 MB.

Up to 10 minutes long.

Your video never leaves your browser. The conversion runs on this machine.

Convert to

H.264 and AAC. Plays in every browser, phone, LMS and editor.

Quality

Hard to tell from the source at normal viewing size.

More options
Video codec

Keeps the video as it is when the format can hold it, HEVC included. Otherwise H.264.

Resolution

Same size as the source.

Frame rate

Same frame rate as the source.

Audio

Kept as it is when the format allows it, otherwise converted at a bitrate set by the quality.

Trim

Seconds, like 12.5, or minutes and seconds, like 1:05. Leave both empty for the whole video.

Result

Worked example

Measured on our own 17 second M4V with H.264 and AAC, converted to MP4 with fast mode on.

Source M4V

3.0 MB

MP4, streams copied

3.0 MB

21 bytes apart: only the header changed. The video and audio are the same bits as before, now in a file every upload form accepts as MP4.

1. Add the M4V. 2. Keep fast mode on. 3. Rewrap locally. 4. Download the MP4.

What Interlace does

One video, 28 languages.

  • Voice and on-screen text in 28 languages from one source
  • Each language is its own video you can edit
  • Subtitles change with the language
See multilingualMore examples

Real Interlace output, unedited. Shown silent and sped up.

Your file

M4V

first-week.m4v

HandBrake export

How a fridge keeps food coldSoft 3D

Questions

Asked and answered

No. The file is opened by the page and converted by ffmpeg compiled to WebAssembly, on your own machine. There is no upload step, and closing the tab discards everything.

Often, yes, because the file is already built like an MP4. Rewrapping is the safer version of the same thing: the new file gets an MP4 header as well as the name, so a strict upload checker or an Android player accepts it.

No. Purchased and rented iTunes videos are locked with Apple's FairPlay DRM, and only Apple's apps can decode them. This page reads unprotected files, such as your own exports and HandBrake encodes.

Yes. Fast mode copies the video and audio bit for bit. Only a resize, frame rate change or trim under More options makes it re-encode.

HandBrake sometimes adds an AC3 track. The MP4 gets the first audio track, converted to AAC if it is not AAC or MP3 already, while the video is still copied untouched.

500 MB and 10 minutes. Everything runs inside one browser tab, which has a fixed memory budget, and the encoder runs on a single thread. A rewrap takes seconds; a full re-encode runs at about real time for 720p and several times the clip length for 1080p. For anything bigger, a desktop encoder such as HandBrake is the better tool.

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