Convert between MKV, MP4, MOV, WebM, and AVI video formats. Pick any input and output format from the dropdown — your files never leave your device. Everything runs locally in your browser — nothing is uploaded.
Convert MKV video files to MP4 format directly in your browser. 100% free, private — your files never leave your device.
Converts MP4 files to MKV format — universal video playback on any device to advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file. All conversion happens locally in your browser with no file size limits.
Convert MP4 video files to MKV format directly in your browser. 100% free, private — your files never leave your device.
Extracts the audio track from uploaded video files (MP4, MOV, AVI, WebM) and encodes it as a high-quality MP3 file. No signup or account required.
Crop the visual area of your MP4, MOV, AVI, or WebM video directly in the browser with preset aspect ratios or custom selections. No signup or account required.
You can convert between MKV, MP4, MOV, WebM, and AVI. Pick any input and any output from the dropdowns. Common use cases include MKV to MP4 for universal playback, MP4 to WebM for the web, and MKV to MOV for Final Cut Pro or iMovie.
Not necessarily. When the underlying codec is compatible, the tool re-encapsulates the file — copying the video and audio streams into a new container without re-encoding — so quality and file size stay the same. This is how fast conversions like MKV to MP4 work. If the source codec isn't supported by the target format, the video is transcoded, which takes longer and can change quality.
Container conversions (like MKV to MP4) copy the existing streams rather than re-encoding them, so the file size stays roughly the same. To actually shrink a video, use the Video Compressor tool instead, which re-encodes with adjustable quality and target size settings.
When re-encapsulating to a container that supports them — MKV and MOV hold multiple audio tracks, chapters, and subtitle streams — those tracks are carried over. MP4's subtitle support is more limited, so subtitle tracks may not survive a conversion to MP4.
No. All processing runs locally in your browser via FFmpeg — your video never leaves your device, nothing is stored, and there are no file size limits. Your videos are completely private.
Video Compressor
Reduces MP4, MOV, and WebM video file sizes using configurable CRF (Constant Rate Factor) encoding, resolution scaling, and bitrate control. Includes a quality preview before processing. Everything runs locally in your browser — nothing is uploaded.
Video to GIF
Convert MP4/WebM to GIF animations. Videos up to 30MB as guest, 150MB signed in, 2GB Pro. Everything runs locally in your browser — nothing is uploaded.
Video to MP3 Converter
Extracts the audio track from uploaded video files (MP4, MOV, AVI, WebM) and encodes it as a high-quality MP3 file. No signup or account required.