Converts MP4 files to AVI format — universal video playback on any device to legacy video compatibility. All conversion happens locally in your browser with no file size limits.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Convert MOV video files to AVI format directly in your browser. 100% free, private — your files never leave your device.
Convert WEBM video files to AVI format directly in your browser. 100% free, private — your files never leave your device.
Convert AVI video files to MKV 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 MP4 video files to MOV format directly in your browser. 100% free, private — your files never leave your device.
MP4 (MPEG-4 Part 14) uses lossy compressed encoding and is best for universal video playback on any device — phones, smart TVs, web browsers, and social media. AVI (Audio Video Interleave) uses uncompressed or lossy encoding and excels at legacy video compatibility — older software, embedded systems, and archival playback. 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.
The converter typically outputs AVI with MJPEG or MPEG-4 codecs. Choose the codec based on your compatibility needs — MJPEG is most widely supported but produces larger files.
If re-encoding occurs, quality depends on the chosen bitrate and codec. Selecting high quality settings preserves visual fidelity. Direct stream copy (no re-encode) is possible if codecs are compatible.
Videos up to 250MB are supported for everyone. Larger files may cause memory issues in the browser. For very long videos, consider trimming first.
Yes. All conversion runs in your browser using FFmpeg WASM. No video files are uploaded to any server.
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. Free to start with no signup.
Crop Video
Crop the visual area of your MP4 or WebM video directly in the browser with 9:16, 1:1, 16:9 presets or custom dimensions with X/Y offsets. Free to start with no signup.
Video Compressor
Reduces MP4, MOV, and WebM video file sizes with a configurable CRF 20–40 slider (default 28, libx264 fast preset), plus a GIF mode with color-palette control. Videos never leave your device — compression runs locally in your browser with FFmpeg WASM.
Video to GIF
Convert MP4/WebM to GIF animations. Videos up to 250MB. Videos never leave your device — compression and conversion run locally in your browser with FFmpeg WASM.
Subtitle Translator
Translate pasted SRT or VTT subtitle text into 9 languages (Spanish, French, German, Japanese, Chinese, Hindi, Portuguese, Russian, Arabic) while preserving every timestamp — AI-powered with your own API key, text never stored.
Video Watermark Adder
Burn text watermarks into a video with 5 position presets (bottom-right default, fixed 24px white on semi-transparent black box). Brand one clip at a time — local FFmpeg work, unlimited saves.