Converts WebM files to AVI format — web-optimized video 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 AVI video files to WEBM 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 MP4 video files to MOV format directly in your browser. 100% free, private — your files never leave your device.
WebM (WebM Video) uses lossy compressed encoding and is best for web-optimized video — streaming, embedded players, and HTML5 video tags with fast loading. 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.
Convert WEBM video files to AVI format directly in your browser. 100% free, private — your files never leave your device.
Complete, uncorrupted WebM files convert cleanly. Partial downloads and truncated files fail or produce broken output — verify the source opens correctly first.
legacy video compatibility — older software, embedded systems, and archival playback.
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.