Video Compressor

What Is Video Compression?

Video compression is the process of reducing the file size of a video by re-encoding it with more efficient codec settings and lower bitrate, while preserving visual quality as much as possible. A 74 MB video can often be compressed to under 10 MB with no perceptible difference to the viewer.

Modern video codecs like VP9 achieve compression by analyzing temporal and spatial redundancy across frames — areas that don't change between frames are stored once, and regions with minimal detail are encoded with fewer bits. The result is a dramatically smaller file that looks virtually identical to the original.

How This Tool Works

Our video compressor runs entirely in your browser. No files are uploaded to any server. Here's what happens when you click Compress:

• Frame-by-frame re-encoding — The video is decoded and each frame is drawn to an HTML5 Canvas at the target resolution, then re-encoded using the VP9 codec via the browser's built-in MediaRecorder API.
• Bitrate optimization — The target bitrate is set according to your chosen compression level: High Quality (~3 Mbps), Balanced (~1.5 Mbps), or Maximum Compression (~600 Kbps). Lower bitrate means smaller file size.
• Resolution scaling — If you select a lower output resolution (1080p, 720p, or 480p), the video dimensions are scaled down, which further reduces file size while maintaining sharpness at the target resolution.
• Audio preservation — Audio tracks are preserved by default via the browser's captureStream API. You can strip audio entirely for even more savings.

Why You Need Video Compression

Smaller video files are essential for many workflows:

• Social media uploads — Most platforms (Instagram, TikTok, Twitter, LinkedIn) have file size limits. Compression lets you fit within limits without sacrificing quality.
• Email attachments — Email providers typically limit attachments to 25 MB. A compressed video fits easily in any email.
• Faster uploads — Smaller files upload faster to any platform, saving time when publishing ad creatives or content.
• Storage savings — Compressed videos take up less space on your device, cloud storage, or CDN.
• Ad platform compliance — Facebook, Google, and TikTok Ads accept video creatives up to certain sizes. Compression ensures your ads are within spec.

Understanding Compression Levels

We offer three compression presets to balance quality and file size:

• High Quality — Preserves nearly all visual detail. Best for professional content where quality is critical. Typical reduction: 20–40%.
• Balanced — The sweet spot for most use cases. Imperceptible quality loss in normal viewing. Typical reduction: 40–60%.
• Maximum Compression — Aggressive compression for the smallest possible file. Some quality loss may be visible in complex scenes. Typical reduction: 60–90%.

100% Browser-Based — Your Videos Stay Private

This tool processes everything locally in your browser using the HTML5 Canvas API and MediaRecorder. Your videos are never uploaded to our servers or any third party. The processing happens entirely on your device, and compressed files exist only in your browser's memory until you download them.

Tips for Best Results

• Start with 'Balanced' compression — it delivers the best trade-off between file size and quality for most videos.
• Lowering the resolution to 720p can cut file size in half while remaining perfectly sharp on mobile screens.
• Remove audio if the video is used as a silent autoplay creative (common in social media ads).
• For videos over 2 minutes, expect compression to take proportionally longer since it runs in real time.
• Combine compressed ad creatives with Adligator's competitive analysis to test more creative variations at scale.