Video Compressor
Compress video files entirely in the browser — reduce file size by lowering bitrate, resolution, and frame rate. Drag-and-drop or pick a video, play it through a hidden <video> + <canvas> + MediaRecorder pipeline at the chosen settings, and download the smaller output as WebM (or MP4 where supported). Bitrate presets (4: 500kbps to 5Mbps), resolution presets (5: 240p to 1080p), aspect-ratio-aware resolution calculator, frame-rate presets (3), compression ratio calculator, file-size estimator, quality score calculator (0-100), format support lookup (webm/mp4), codec support lookup (VP8/VP9/H.264/AV1), filename generator, history (localStorage), shareable URL, video preview before/after, and summary stats (input size, output size, % reduction, compression ratio, quality score). 100% client-side.
About Video Compressor
Compress video files entirely in the browser — reduce file size by lowering bitrate, resolution, and frame rate. Drag-and-drop or pick a video, play it through a hidden <video> + <canvas> + MediaRecorder pipeline at the chosen settings, and download the smaller output as WebM (or MP4 where supported). Bitrate presets (4: 500kbps to 5Mbps), resolution presets (5: 240p to 1080p), aspect-ratio-aware resolution calculator, frame-rate presets (3), compression ratio calculator, file-size estimator, quality score calculator (0-100), format support lookup (webm/mp4), codec support lookup (VP8/VP9/H.264/AV1), filename generator, history (localStorage), shareable URL, video preview before/after, and summary stats (input size, output size, % reduction, compression ratio, quality score). 100% client-side. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
How does the video compressor work in the browser?
Drop or pick a video file. We load it into a hidden <video> element, then play it through a <canvas> at your chosen resolution while MediaRecorder captures the canvas stream (plus the original audio track) at your chosen bitrate and frame rate. The output is downloaded as a WebM (or MP4 where the browser supports recording it). No upload — all encoding happens locally.
What bitrate / resolution / frame rate should I pick?
Bitrate presets range from 500 kbps (very low, smallest file) to 5 Mbps (high, near-original). Resolution presets: 240p, 360p, 480p, 720p, 1080p — the width is computed from the source aspect ratio. Frame rate: 24, 30, or 60 fps. Lowering any of these three reduces file size at the cost of visual quality.
How is the compression ratio calculated?
Compression ratio = input file size ÷ output file size. A ratio of 4.0 means the output is 4× smaller than the input. The percentage reduction is computed as (input − output) ÷ input × 100. Both are shown in the summary stats after compression finishes.
What extra features does this tool have compared to others?
(1) 4 bitrate presets (500kbps to 5Mbps). (2) 5 resolution presets (240p to 1080p). (3) Aspect-ratio-aware resolution calculator. (4) 3 frame-rate presets (24/30/60). (5) Compression ratio calculator (input ÷ output). (6) File-size estimator (bitrate × duration / 8). (7) Quality score calculator (0-100, based on bitrate × resolution). (8) Format support lookup (webm/mp4 via MediaRecorder). (9) Codec support lookup (VP8, VP9, H.264, AV1). (10) Filename generator (timestamped). (11) History (localStorage, last 20). (12) Shareable URL settings. (13) Drag-and-drop file input. (14) Summary stats (input size, output size, % reduction, compression ratio, quality score). (15) Video preview before & after.
Is my data sent anywhere?
No. The video file you load, the captured canvas frames, and the output WebM/MP4 never leave your browser. There is no upload. Compression metadata in history is stored in localStorage on this device only.
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