Video Compressor

Video Compressor — Reduce Video File Size in the Browser

Video files are large. A 2-minute clip from a phone camera can easily be 200–500MB in full resolution. Most messaging apps, email attachments, and upload forms have size limits well below that. This browser-based video compressor reduces file size by re-encoding the video at a lower bitrate, smaller dimensions, or both — without sending the file to any server.

How video compression works

Video file size is determined by bitrate (how many bits per second of video data), resolution (width × height in pixels), frame rate (frames per second), and codec (the algorithm used to encode the video). Reducing any of these produces a smaller file. The tradeoff is quality — lower bitrate or resolution produces visible quality loss, especially in scenes with fast motion or fine detail.

The compressor re-encodes the video using WebCodecs (if your browser supports it) or a fallback encoder, applying your chosen quality settings. The result is a new video file that plays identically to the original but at a smaller size.

Common use cases

WhatsApp and messaging apps: WhatsApp limits video attachments to 16MB (rising to 100MB with Business accounts). Phone camera videos often exceed this. Compress to under 16MB before sending — the recipient's quality experience on a small phone screen is indistinguishable from the original at moderate compression.

Email attachments: Most email services cap attachments at 25MB. A compressed 720p version of a short clip easily fits within this limit while being more than adequate for the viewer.

Website and landing page videos: Autoplay background videos on websites need to be small — ideally under 5MB — to not slow down page loading. Compress and consider also converting to WebM format for web use.

Storage management: If you're running out of phone or laptop storage, compressing old video files reduces their footprint significantly without deleting them entirely.

Social media uploads: Platforms like Instagram, YouTube, and Twitter re-compress your video anyway — but starting with a well-compressed file can produce better results than letting the platform handle it aggressively.

Quality settings guide

For WhatsApp and messaging, 720p resolution at medium quality produces files in the 5–20MB range for short clips — usually sufficient. For archival or sharing where quality matters more, keep the original resolution and only reduce the bitrate modestly. For social media where you want small size, 480p at medium-low quality works for most content types except fast action or sports.

Tips

Compression takes time — especially for longer videos or high-resolution source files. The process runs in your browser and uses your device's CPU. Keep the tab in the foreground and don't close it during processing. On low-powered devices, a 5-minute video may take several minutes to compress.

If you need to share a very long video (over 10 minutes), consider trimming it to the relevant section first, then compressing. Reducing duration has more impact on file size than compression alone.

Limitations

Browser-based video compression is slower and produces slightly lower quality than desktop tools like HandBrake. For large batches of videos or files over 1GB, a desktop application is more practical. This tool is ideal for occasional compression of individual files without needing to install anything.

The output quality depends on the quality of the source. Heavily compressed source video (like content downloaded from social media) will degrade further upon recompression — compression artefacts from the original become more visible.