Free Online Video Compressor
Compress video directly in your browser with CRF and resolution controls. Choose a file from your device, Google Drive or Dropbox and create an H.264 MP4 with AAC audio without installing software.
Video Compressor
Compress video without uploading it
Reduce video file size directly in your browser with flexible quality and resolution controls.
Select Video File
Drop your video here or click to upload
Your browser cannot preview this format, but FFmpeg may still be able to compress it.
Compression complete!
Your compressed video is ready to preview and download.
Compress Video Online and Reduce File Size
Large video files can be slow to upload, difficult to share and expensive to store. CyberTools Video Compressor reduces video size directly in your browser using FFmpeg.wasm, so you can compress a video without installing a desktop editor.
Choose a video from your device, Google Drive or Dropbox, then use a preset or adjust the compression settings yourself. The finished file is exported as an MP4 with H.264 video and AAC audio.
Reduce Video File Size
Use CRF compression and optional resolution reduction to create a smaller video for sharing, uploading or storage.
Control Compression Quality
Use Small, Standard or High Quality presets, or switch to Custom when you want direct control over CRF and output resolution.
Choose Output Resolution
Keep the original resolution or choose 1080p, 720p, 480p or 360p when a smaller output is more important.
Local Browser Processing
Files selected from your device are processed locally in the browser. Cloud files are fetched from the selected provider into the browser before local compression.
How to Compress a Video Online
You can reduce video size without installing desktop compression software.
Choose Your Video
Select a local video, drag and drop a file, or import a video from Google Drive or Dropbox.
Choose Compression Settings
Use Small at CRF 32 and 480p, Standard at CRF 26 and 720p, High Quality at CRF 22 with the original resolution, or choose Custom settings.
Compress and Download
Start browser-based compression, review the resulting file size and download the H.264 MP4 when processing finishes.
Balance Video Quality and File Size
CRF controls the quality-versus-size trade-off for H.264 encoding. Lower CRF values generally preserve more visual detail, while higher values generally produce smaller files.
High Quality
The High Quality preset uses CRF 22 and keeps the original resolution, making it suitable when preserving detail matters more than maximum size reduction.
Standard
The Standard preset uses CRF 26 with a 720p target, providing a practical balance between visual quality and file size for everyday use.
Small Size
The Small preset uses CRF 32 with a 480p target for stronger size reduction when a compact output matters most.
Why Compress a Video?
A smaller video can be easier to transfer, publish and store when the original file is larger than necessary.
Email & Attachments
Reduce video size before attaching a file to email or submitting it through a form with file-size limits.
Messaging & Sharing
Create a smaller copy that is easier to send through messaging, collaboration and file-sharing services.
Web Publishing
Compress oversized videos before uploading them to websites, content systems or online platforms.
Save Storage Space
Keep a smaller H.264 MP4 copy when the full-size original is unnecessary for the intended use.
Faster Transfers
Smaller files generally require less data to upload or transfer, which can help on slower connections.
Mobile-Friendly Copies
Lower-resolution compressed versions can be more practical to store, transfer and watch on mobile devices.
How Local and Cloud Video Processing Works
When you choose a file from your device, compression happens inside your browser and the source video is not uploaded to CyberTools for server-side encoding. When you choose Google Drive or Dropbox, the selected cloud file is fetched from that provider into your browser and compression then runs locally.
Browser-based video encoding can use significant CPU and memory. Large, high-resolution or long videos may take longer or may exceed the memory available to the browser.Can You Compress Video Without Losing Quality?
This tool uses H.264 lossy video compression, so reducing file size can remove some visual information. Lower CRF values generally retain more detail, while stronger compression and lower resolutions can produce smaller files.
CRF targets visual quality rather than an exact file size. The final size depends on the source video, duration, motion, detail, resolution and selected CRF, so a particular preset cannot guarantee a specific number of megabytes.
Video Compressor FAQ
Common questions about browser-based video compression with CyberTools.
Is CyberTools Video Compressor free?
Does CyberTools upload my video for compression?
What video format does the compressor create?
What do the Small, Standard and High Quality presets use?
What is CRF in video compression?
Can I compress a video to an exact file size?
Which video formats can I compress?
Why can a large video fail to compress in the browser?
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