Convert videos between formats

Updated 28 September 2026

To convert a video, drop it on the page, choose MP4, WebM, MOV, MKV or AVI, and download the new file. If you are unsure which to pick, take MP4: phones, TVs, computers, browsers and editing programs almost all understand it.

The job runs on our servers in Germany. Your video reaches them over an encrypted connection, and we delete it and the converted copy automatically within two hours.

How to convert videos to another format

1. Drop one video, several, or an entire folder onto the page.
2. Pick MP4, WebM, MOV, MKV or AVI as the target.
3. Start the conversion and let the re-encode finish.
4. Download the results individually or bundled into one ZIP.

Container and codec: why a file refuses to play

A video file has two layers. The outer layer is the container, the part named by the extension: .mp4, .mkv, .webm. Inside sit the codecs that squeeze the picture and the sound down to a manageable size. A player has to handle both layers, so the same file can open on one device and fail on another. A conversion produces a new file whose container and codecs the target can read.

Choosing an output format

MP4 is the safe answer when the destination is unknown. It carries H.264 video with AAC audio.

WebM combines Opus audio with VP9, an open video codec. The format was made for the web, every current browser plays it, and it suits clips embedded in a page. VP9 is slower to encode than H.264, so a WebM job takes longer than the same clip as MP4.

MOV gets the same H.264 and AAC pair as MP4, in a different container, which helps with players and editing software that expect a .mov file. MKV, a flexible container often used for archives, also holds H.264 and AAC here. For AVI, an older container, we use MPEG-4 video and MP3 audio, which is what legacy players and devices ask for.

Does converting cost quality?

Changing the format means re-encoding, and each pass through a lossy codec gives up a little detail. Our defaults target output that looks identical to the source when watched normally. The new file can end up larger or smaller than the old one. If what you want is a smaller file, compress the video instead, where you control the quality directly.

Converting a folder of old videos

A drive full of old AVI files is a typical batch job. Drop the folder, pick MP4 once, and collect everything as a single ZIP when it is done.

Video conversion is a heavy job, so the free allowance is modest: 3 videos a day without an account, 5 with a free one, and 50 MB per file. For a real archive, Pro raises the file limit to 500 MB and the batch size to 500 files with no daily allowance, for EUR 7.99 a month or EUR 59 a year. If you only need one big run, credits work without a subscription. One credit covers 25 files in a batch or pipeline, and credits never expire.

Long clips and high resolutions take more time to convert. A pipeline can chain the conversion with other steps, for example convert, then compress, then rename, and is free to try on up to 3 files.