MKV holds anything. MP4 has a guest list.
A film in MKV often carries several soundtracks, a stack of subtitles and even fonts. Tell us where it'll play, and decide track by track what comes along: most can move across untouched.
Open MP4, MKV, MOV, AVI, WMV, FLV, RealMedia, DVD VOB, camcorder MTS or almost anything else, and save it as any of 32 formats. The converting happens in this tab. Your video is never uploaded.
Each file is identified from its first bytes as soon as you add it. Once the engine is loaded it is read in full, so you see the real codecs, size and length before you convert.
MPEG-4 Part 14 on the ISO base media format. The safest choice when a file has to play anywhere.
ffmpeg -i input.mp4 -map 0:v:0 -map 0:a:0? -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -c:v libx264 -preset veryfast -crf 23 -pix_fmt yuv420p -c:a aac -b:a 128k -ac 2 -f mp4 -movflags +faststart video.mp4MP4 only understands plain timed text. Styled anime subtitles lose their fonts and positions; subtitles ripped from Blu-ray are pictures, not text, and can't be carried at all. The fallback for both is burning them into the picture: permanent, and it means re-encoding the video.
SRTPlain textTimed lines of text. The simplest kind.ASSStyled textFonts, colours, positions, karaoke effects.PGSImagesPictures of text, ripped from Blu-ray discs.Film soundtracks in MKV are often DTS or Dolby TrueHD in 5.1: six channels that phones and browsers can't play. Folding them into stereo mixes the centre (where dialogue lives) and the surrounds into left and right. Keeping both lets a home cinema use the original and a phone use the stereo.
Besides picture and sound, an MKV can carry extras. Here's what each becomes in MP4.
Changing the container doesn't change the size. For that, or for a clip, use these.
Yes, MKV to MP4 conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.
No. The MKV to MP4 converter runs in your browser when your file is supported there, so the file stays on your device for that workflow, reducing server exposure for that workflow. If the file is sensitive, check the processing mode first.
Most MKV to MP4 conversions finish in under a minute. Bigger files take longer, in proportion to their size. There is no queue to join and no account to make first.
Depends on what you are converting between. Go lossless to lossless and the picture or the audio comes out untouched. Go to a lossy format and you give up a little to get a smaller file.
Yes. The MKV to MP4 converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.