Trim 4K Video Online
4K videos are huge - often 1-5GB for just a few minutes. Most online tools crash on files this size, or take forever to upload. JustTrimVideo handles 4K effortlessly because nothing uploads - your video stays on your device.
Why 4K Trimming Is Different
4x
More pixels than 1080p
4-8x
Larger file sizes
0 sec
Upload time with us
4K Sources We Support
GoPro / Action Cameras
HEVC/H.265 footage at 4K 60fps. Trim to the best moments of your adventure.
Drone Footage
DJI and other drones record stunning 4K. Cut to the cinematic shots.
iPhone / Android
Modern phones shoot 4K by default. Trim before sharing to save data.
Mirrorless / DSLR
Sony, Canon, Panasonic - all major camera formats supported.
How to Trim 4K Video
- 1 Load your 4K file
Select your video - even 2-4GB files load in seconds (no upload).
- 2 Preview in full quality
Scrub through your 4K footage to find the best shots.
- 3 Set precise trim points
Mark start and end. Use keyboard shortcuts for frame-accurate cuts.
- 4 Download - lossless quality
Stream copy mode preserves every pixel. No re-encoding, no quality loss.
Lossless 4K Trimming
JustTrimVideo uses stream copy mode by default. This means:
- No re-encoding: Your 4K pixels stay exactly as recorded
- Instant processing: No waiting for re-compression
- Original bitrate: Same quality as the camera produced
- All metadata preserved: GPS, timestamps, camera settings intact
4K File Size Reference
Approximate 4K file sizes (varies by codec and bitrate):
| Source | 1 min | 5 min | 10 min |
|---|---|---|---|
| iPhone 4K 30fps | ~350MB | ~1.7GB | ~3.5GB |
| GoPro 4K 60fps | ~500MB | ~2.5GB | ~5GB |
| DJI Drone 4K | ~400MB | ~2GB | ~4GB |
| Mirrorless Camera | ~600MB | ~3GB | ~6GB |
Trimming removes proportional file size. Trim 10 minutes to 1 minute = 90% smaller file.
Tips for Large 4K Files
Use a Desktop Computer
More RAM = larger files. Desktops typically handle 2-4GB easily.
Close Other Browser Tabs
Free up memory for the video processing.
Use Chrome or Edge
These browsers handle large files most efficiently.
Check Your Device Limit
The tool shows your specific max file size when loaded.
Ready to trim your 4K video?
Go to the Video Trimmer →