Video format converter

• Choose a local video and WebM, MP4, MOV or AVI output.
• For WebM/MP4/MOV, choose a quality preset or whole-number video bitrate of 64–50,000 kbps (0 uses the preset). For AVI, choose 1–60 whole fps, a maximum side of 640/1280/1920 pixels, and JPEG quality 1–100.
• Select Process media and download the result. AVI uses fixed-rate MJPEG/PCM with explicit smaller clip limits. Cancel or Reset stops processing.

Convert an MP4 clip to AVI at 24 fps, 1280 maximum side and JPEG quality 90. Or choose WebM/MP4/MOV and compare the existing quality presets.

• Files are processed locally with no upload or playlist fetching.
• Input must contain a readable video track. Audio-only files are not accepted by this tool.
• 128 MiB input/output, 5-minute duration, 8-megapixel video, 8192 pixels per side, 1–2 audio channels at 8–96 kHz, and a 120-second processing deadline.
• Decoding and some output encoders depend on browser codec support. Encrypted media is unsupported.
• Primary tracks only; subtitles and extra tracks are not carried into new outputs.
• Re-encoding may change quality. Descriptive tags/artwork are removed from new media; technical encoding headers remain.
• Decoded video is limited to 9,000 frames and four billion pixels. Separate VP8/VP9 alpha planes are decoded and composited onto black. Input color metadata is kept as supplied; WebM/MP4/MOV RGB output uses explicitly tagged limited-range BT.601 YUV; AVI uses browser JPEG color encoding. Lossy codecs, browser color management and HDR conversion can still affect color fidelity.
• Video compression is lossy and does not guarantee a smaller file. Actual bitrate and file size depend on the encoder, content, duration, audio and container overhead. The target is variable video bitrate only; audio retains its existing High setting.
• AVI support is limited to one full-frame MJPEG or uncompressed BGR24/BGRX32 video stream and optional PCM8/16/24/32 or float32 mono/stereo audio, including canonical extensible PCM. Palette video, Xvid/DivX, DV, inter-frame codecs, field-based MJPEG, edited index ordering and display-aspect overrides are rejected.
• AVI RIFF/AVIX chunks are read sequentially within file bounds, up to 64 segments, 200,000 chunks, 9,000 frames and 240 frames/second. AVI indices are never followed.
• MOV output is a genuine QuickTime container with AVC video and AAC audio. AVC encoding still depends on browser support.
• AVI output: 60 seconds, 1800 frames, 2.1 megapixels per output frame, 2 billion encoded output pixels, 128 MiB, and the same 120-second processing deadline. Maximum-side scaling never enlarges input. Lower quality/resolution or shorten a clip if output is too large.
• AVI uses full-frame MJPEG and optional mono/stereo 48 kHz signed 16-bit PCM. Fixed-rate frame holds/drops replace variable-rate presentation; the tail rounds up by less than one frame with silent audio padding. No Xvid/DivX or interlaced output. MP4/MOV/WebM/Matroska input only for this mode.
• AVI audio includes at most one second of negative decoder priming, rejects overlapping or excessive timelines, clips at full scale when quantizing PCM, and keeps gaps as silence. Browser decoding/resampling and inconsistent source packet timing can cause small waveform differences.