Video Compressor

Reduce video file size while maintaining quality. Perfect for sharing, uploading, or saving storage space.

TL;DR

Compress videos to reduce file size while maintaining quality. Upload any video file (up to 500MB), choose between quality-based or size-based compression, then download the smaller file. All processing happens in your browser—your videos never leave your device. Perfect for uploading to social media, sharing via email, or saving storage space.

How to Compress Videos

Reduce video file size with full control over quality and output size.

Step-by-Step Guide

Step 1: Upload your video. Drag and drop a video file or click to browse. Supports MP4, MOV, WebM, and most common video formats up to 500MB.

Step 2: Choose compression method. Select "Quality-Based" to choose a quality preset (High, Medium, Low) or "Size-Based" to target a specific file size in KB, MB, or GB.

Step 3: Compress the video. Click "Compress Video" and watch the progress bar. The tool shows the compression percentage as it processes.

Step 4: Review and download. See the original size, compressed size, and percentage saved. Download your compressed video or try different settings if needed.

Understanding Compression Settings

Choose the right compression method for your needs.

Quality-Based Compression (CRF). Uses Constant Rate Factor (CRF) to maintain consistent visual quality. Lower CRF = better quality but larger file. High Quality (CRF 18) has minimal visible loss, Medium (CRF 23) balances size and quality, Low (CRF 28) maximizes compression.

Size-Based Compression. Specify your target file size and the tool calculates the optimal bitrate to achieve it. Useful when you need to meet a specific platform's upload limit or email attachment size.

When to use which. Use quality-based when you want predictable visual quality regardless of duration. Use size-based when you need to hit a specific file size target (like a 25MB email attachment limit).

When to Compress Videos

Video compression is essential for many common workflows.

Social media uploads. Platforms like Instagram, TikTok, and Twitter process uploads faster with smaller files. Compress before uploading for quicker processing. Check platform-specific requirements in our content strategy course.

Email attachments. Most email services limit attachments to 25MB. Compress videos to share via email instead of using file-sharing services.

Website performance. Large videos slow down websites. Compress videos for web use to improve page load times and user experience.

Cloud storage savings. Compressed videos take less storage space on Google Drive, Dropbox, iCloud, or local drives—perfect for archiving.

Sharing on messaging apps. WhatsApp, Discord, and other messaging apps have file size limits. Compress videos to share directly in chat.

Tips for Best Compression Results

Get the smallest file size without sacrificing visible quality.

Start with Medium quality. CRF 23 provides a good balance for most videos. Only go lower (High quality) if you notice artifacts, or higher (Low quality) if file size is critical.

Consider the content. Videos with lots of motion (sports, action) need higher quality settings to avoid artifacts. Static content (talking head, slides) compresses very well even at lower quality.

Try "Compress Again" with different settings. If the first attempt doesn't meet your needs, use the "Compress Again" button to try different quality levels without re-uploading.

Resolution matters too. If your video is 4K but you only need 1080p, consider using our Aspect Ratio Converter to reduce resolution first—this dramatically reduces file size.

Frequently Asked Questions

Is my video uploaded to a server?

No, all compression happens locally in your browser using WebAssembly technology. Your video never leaves your computer. This ensures privacy and means you can compress videos even offline after the page loads.

What's the difference between quality-based and size-based compression?

Quality-based uses a Constant Rate Factor (CRF) that maintains consistent quality regardless of video length. Size-based calculates the bitrate needed to achieve your target file size, which may vary in quality depending on video duration and complexity.

Why is my compressed video larger than the original?

This can happen if your original video was already heavily compressed or uses a more efficient codec. The tool re-encodes to H.264, which may not always beat the original compression. Try a lower quality preset for more aggressive compression.

What quality preset should I use?

Medium (CRF 23) is recommended for most uses—it provides a good balance of quality and file size. Use High for videos you want to look their best, and Low only when you need maximum compression and can accept some quality loss.

How much can I reduce file size?

Typical compression achieves 30-70% reduction depending on the original encoding and quality settings. Videos that were shot in high bitrate (like from cameras) compress more than videos already from social media.

Key Takeaways

  • 1100% browser-based—your videos stay on your device
  • 2Quality-based for consistent quality, size-based for specific targets
  • 3Medium quality (CRF 23) works well for most uses
  • 4Great for social media, email, and storage savings
  • 5Re-compress with different settings without re-uploading
  • 6More motion = need higher quality settings

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