Converts AVI files to MKV format — legacy video compatibility 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.
Initializing WebAssembly Core...
Convert MKV video files to AVI format directly in your browser. 100% free, private — your files never leave your device.
Convert MKV video files to WEBM format directly in your browser. 100% free, private — your files never leave your device.
Convert MP4 video files to AVI format directly in your browser. 100% free, private — your files never leave your device.
Convert MKV video files to MP4 format directly in your browser. 100% free, private — your files never leave your device.
Convert AVI video files to MP4 format directly in your browser. 100% free, private — your files never leave your device.
AVI (Audio Video Interleave) uses uncompressed or lossy encoding and is best for legacy video compatibility — older software, embedded systems, and archival playback. MKV (Matroska Video) uses lossless container encoding and excels at advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
Common formats include MP4, MOV, AVI, WebM, MKV, and GIF. The exact list varies by tool.
Processing time depends on file size, your device's CPU, and the operation. Most conversions complete within seconds to a few minutes.
Quality depends on your selected settings. Higher bitrate and resolution presets produce better quality but larger file sizes.
Yes. All video processing uses FFmpeg WASM running locally in your browser. No uploads or servers involved.
There's no imposed limit, but files over 500MB may require significant RAM and could perform slowly on older devices.
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.
Crop Video
Crop the visual area of your MP4 video entirely in the browser.
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. Handles files up to 500MB.
Video to GIF
Convert MP4/WebM to GIF animations. Max 500MB input.
Subtitle Translator
Accepts SRT or VTT subtitle files and translates their text content into any of 100+ target languages while preserving exact timing codes and frame.
Subtitle Generator
Generate SRT subtitle files from video automatically. Supports multiple languages with accurate timestamp alignment for your videos.