How to use Video converter
- 1
Add up to 3 videos
Drop MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP or MTS files of up to 500 MB and 10 minutes each.
- 2
Choose the output
Pick MP4, WebM, MOV, MKV, AVI or GIF, or extract only the sound as MP3, M4A, WAV, OGG or FLAC.
- 3
Check the badge
Files marked Fast · no quality loss are repackaged as they are; others are re-encoded at the quality and resolution you set.
- 4
Convert and download
Press Convert, follow each file's progress, then download them one by one or as a single ZIP.
Limits and Pro
Up to 3 videos per batch, each up to 500 MB and 10 minutes long; GIF output covers the first 30 seconds.
Pro converts batches of up to 500 videos, each as large as 4 GB and as long as 10 hours. See Pro
About Video converter
Video converter changes the container of a video, re-encodes it when the new format needs different codecs, or extracts its audio. A file is a container (MP4, MOV, MKV, WebM, AVI) holding streams compressed with codecs such as H.264, HEVC, VP9 and AAC. When the streams already suit the target — an iPhone MOV going to MP4, or almost anything going to MKV — they are copied into the new container untouched, which takes seconds and loses nothing. Otherwise every frame is decoded and encoded again: MP4 and MOV use H.264 with AAC audio, WebM uses VP9 or VP8 with Opus, and AVI uses MPEG-4 Part 2 with MP3 for old DVD players and TVs.
Audio-only outputs keep the original audio stream whenever the container allows, so M4A from most phone videos is an instant, lossless copy; MP3 and OGG are encoded at the bitrate you pick, 192 kbps by default, and WAV and FLAC are lossless. GIF output takes up to the first 30 seconds at the width and frame rate you choose. Container tags such as the title travel with the file; only the first video and audio track are kept.
Use it when a website, editor or TV refuses a format, to make phone videos play on Windows, or to pull a song or a talk out of a recording. Converting can't improve quality, and re-encoding always costs a little, so prefer the fast, lossless path when it is offered. DRM-protected purchases and streaming downloads can't be converted.
Privacy
Probing, repackaging and encoding all happen in this tab: through your browser's WebCodecs encoder via mediabunny, or through ffmpeg.wasm in a Web Worker for formats WebCodecs can't handle. Your videos are never uploaded. The 31 MB ffmpeg core comes from the jsDelivr CDN the first time it is needed, is cached afterwards, and that request contains nothing from your files.
Features
Lossless remux
Changes the container without touching the video when codecs allow, fast and with zero quality loss.
Extract audio
Save the soundtrack as MP3, M4A (AAC), WAV, OGG (Opus) or FLAC. AAC audio is often copied as is into M4A.
Batch conversion
Convert several videos in one go and download them together as one ZIP file.
GIFs too
Make a quick animated GIF from the start of a video, or use Video to GIF for full control.
Containers vs. codecs
A video file is a container (MP4, MOV, MKV, WebM, AVI) holding streams encoded with codecs (H.264, HEVC, VP9, AV1 for video; AAC, Opus, MP3 for audio). Changing only the container is quick and lossless. Changing the codec means decoding and re-encoding every frame, which takes longer and always loses a little quality.
MP4 with H.264 and AAC is the safest choice for sharing. MKV can hold almost anything, so it's usually a lossless remux. WebM needs VP8, VP9 or AV1 video with Opus or Vorbis audio, so most MP4s are re-encoded when converted to WebM.