Compress Video Online

Reduce your video file size without losing visible quality. Upload, set your target, and download the compressed result.

How it works

  1. Upload your video. Drag and drop your video file into DomeScribe or click the upload area to browse your device. MP4, WebM, MOV, AVI, and MKV files are all supported.
  2. Choose target size or quality. Set a target file size or select a quality preset. DomeScribe will automatically adjust the compression settings to meet your goal while preserving as much visual quality as possible.
  3. Compress your video. Click Compress and DomeScribe will process your video. The compression engine balances file size and quality using efficient encoding.
  4. Download the compressed file. Once compression is complete, preview the result and download the smaller video file. You will see the final file size and how much space you saved.

Video compressor at a glance

Input formats
MP4, WebM, MOV, AVI, MKV
Typical size reduction
50–80% with minimal visible quality loss
Presets
Small, Balanced, High Quality
Privacy
Compression runs in your browser — the video never leaves your device
Free tier
10 compressions per month

Frequently asked questions

Will compressing my video reduce quality?

DomeScribe uses smart compression that minimizes visible quality loss. At moderate compression levels most viewers will not notice a difference. You can control the balance between file size and quality using the preset options.

What is the maximum file size I can compress?

DomeScribe supports video files up to several gigabytes on the free tier. Large files may take longer to process, but there is no hard cutoff for most common file sizes. Check your plan for specific limits.

What video formats are supported for compression?

DomeScribe can compress videos in MP4, WebM, MOV, AVI, and MKV formats. The output is typically MP4, which is the most universally compatible format.

Is video compression free on DomeScribe?

Yes, DomeScribe offers free video compression. Upload your file, set your target, and download the compressed result.

How much can I reduce the file size?

Results vary depending on the source video, but DomeScribe can typically reduce file sizes by 50 to 80 percent without significant quality loss. Videos with high original bitrates see the biggest reductions.

What is the best free tool to compress a video for email or Discord?

DomeScribe compresses video free, directly in your browser — the file never gets uploaded to a server, so even large videos compress quickly and privately. Use the Small preset to get under common limits like email attachment caps (~25 MB) or Discord's upload limit, or pick Balanced to keep more quality.

Can I compress a video without uploading it anywhere?

Yes — that is exactly how DomeScribe works. Compression runs inside your browser using WebAssembly, so the video never leaves your device. There is no upload wait, no server storing your footage, and it works the same for sensitive personal videos as for work files.

Related tools

  • Compress Audio Files Online — Compress audio files online for free. Reduce MP3, WAV, FLAC file sizes while preserving sound quality. No installation required.
  • Free Online Video & Audio Converter — Convert video and audio files between formats. MP4, WebM, MOV, MP3, FLAC, WAV, and more. Free browser-based converter.
  • Free Online Video Downloader — Download videos from YouTube, TikTok, Instagram, Facebook, Vimeo, Twitter, Dailymotion, and Twitch in 4K, 1080p, or MP3. Free and fast.