Compress a video without installing software
No admin rights, no installer, no upload - the encoder comes to the tab instead.
Your browser can run a real video encoder: GigAI's compressor is ffmpeg compiled to WebAssembly, re-encoding to H.264 (CRF 23) in the tab. Nothing installs, nothing uploads - which also means it works on locked-down work laptops where HandBrake isn't an option.
4 tools for this
Each one is free, private and runs in your browser. No sign-up, no watermark.
Video Compressor
Compress video in your browser with FFmpeg, shrink MP4, MOV, WebM and MKV files with a simple quality slider, see the exact bytes and percentage saved next to a live preview, then download. Nothing is uploaded.
Video Resizer
Resize video resolution in your browser with FFmpeg: scale MP4, MOV, WebM and MKV to 1080p, 720p, 480p or a custom width and height, lock the aspect ratio or fit-and-pad, then download. Nothing is uploaded.
GigAI Fit
Tell GigAI the maximum size you need and it works out how to get there, images, PDFs, video and audio, all compressed in your browser.
Video Trimmer
Cut and trim video online in your browser, drag a visual timeline to set exact start and end points, preview the selection, and download the clip. No uploads, no account, no watermark.
How to fix it
Follow these steps and you'll have it sorted in a couple of minutes.
- 1
Drop the video
The ~31 MB encoder loads once into the tab; your file stays put.
- 2
Compress
Full H.264 re-encode at CRF 23 - the same mechanism desktop tools use, honestly slower than native.
- 3
Need an exact number? Use Fit
“Under 25 MB for Gmail” is GigAI Fit's job - it searches quality levels until the file fits.
- Compressing an already-compressed download and expecting big savings - re-encoding efficient sources can even grow them slightly.
- Using 'online video compressors' that upload to process: the upload often takes longer than local encoding would have.
Frequently asked questions
More problems we solve
Ran into one of these too? Here's the fix.
- My video is too big to send on WhatsAppPick the WhatsApp preset and send the clip. No settings to understand, no upload.
- I need to trim or cut a videoCut off the dead air at the start, keep just the good part, or split a long clip, right in your browser.
- GDPR-safe file conversion for client documentsThe cleanest data-processing agreement is the one you don't need.
Keep exploring
Problems we solve
Definitions
From the blog
- MP4 vs WebM: Which Video Format Should You Use?
- How to Convert MOV to MP4 (From iPhone or QuickTime, Without Quality Loss)
- How to Merge Video Clips Into One File (Without Re-Encoding When You Can)
- How Browser-Based Video Editing Works (ffmpeg.wasm and the Privacy Angle)
- The Quiet Rise of On-Device AI (Your Browser Is Getting Smarter)
Compare formats
By file type
Common tasks
Ready? Start with Video Compressor
Free, private and instant: everything runs in your browser.