Convert videos to any format

34 formats, grouped by what they are for

Each tile in the converter carries a few words on what its format is for, such as Plays everywhere for MP4, so you do not need to know them by heart. Going in, anything FFmpeg reads works: all of those, plus older or rarer files such as RM, DivX, DV and ASF. If you need a format that is not in the list, type its extension in Find a format, and Octoolo hands the job to FFmpeg with FFmpeg's own settings for it.

As it is: converting without re-encoding

Many conversions only need a new container. An MKV holding H.264 video and AAC sound can become an MP4 by copying both across untouched: the new file is ready about as fast as your disk can write it, and nothing is lost. The file then says Copied as it is, nothing re-encoded.

Copying is what As it is does whenever the new format can hold the streams and nothing about them has to change. A smaller size, a lower frame rate, another codec, or a format that cannot hold the picture (WMV, MPEG or WebM for H.264 video, for example) means encoding again, which Octoolo then does at high quality. If a copy fails, it re-encodes by itself.

• High: re-encoded at high quality, never needlessly bigger than the original.
• Balanced: good quality at about half the size.
• Small: the smallest files, for sharing and email.

Codecs, sizes and frame rates

Open More settings to choose what goes inside the file:

• Video codec, where a format offers more than one. MP4 takes H.264, H.265, AV1 or MPEG-4 (Xvid); MOV takes H.264, H.265, Apple ProRes or MPEG-4; WebM takes VP9, AV1 or VP8; MKV most of them. H.264 plays nearly everywhere, H.265 and AV1 make smaller files for devices that play them, and ProRes is for editing apps.
• Size: 4K, 1440p, 1080p, 720p, 480p, 360p or 240p, measured on the short side and never larger than the original.
• Frames a second: 60, 50, 30, 25, 24, 15 or 10, never more than the original has.
• Sound: switch off Keep the sound to drop it, or choose its codec, bit rate (64 to 320 kbps), sample rate and channels.

Every sound track and text subtitle comes along into MP4, MOV and WebM, and MKV keeps every subtitle as it is. For H.264, H.265 and AV1, Octoolo tries a working NVIDIA, AMD or Intel graphics encoder first, then the one built into Windows, then the processor.

Converting a whole folder

Drop a folder and Octoolo finds every video in it and in the folders inside it, three levels deep, up to 500 files at a time. Copies run several at once; conversions that re-encode the picture take their turn one after another. You can open another Octoolo app meanwhile and the work carries on.

New files go in the same folder as each original, or all in one folder you choose, under the original name with the new extension. Nothing is ever written over: if the name is taken, the new file becomes “clip (2).mp4”. When the batch ends, a summary shows how many files were converted and the total size before and after.

Popular conversions have pages of their own: MOV to MP4, MKV to MP4, WebM to MP4, AVI to MP4, WMV to MP4, HEVC to MP4, MP4 to MOV, MP4 to WebM, MP4 to AVI, MP4 to GIF and MP4 to MP3.