Compress Video to 4K
Downscale or upscale to 4K (2160p) with smart H.264 CRF encoding. Browser-based, free, no watermark, runs entirely client-side.
Recommended FFmpeg settings
Need to compress video to 4K (2160p)? This tool uses smart H.264 CRF encoding to resize your video while controlling the quality trade-off. 4K (2160p / UHD) is the highest common consumer resolution. 4K is worth it for home theater, large-screen viewing (50+ inches), professional video production, and future-proofing important archives. For most web and social media use, 4K is overkill — but it's the right choice for high-end content where every detail matters. vs 1080p: 4× more pixels, ~3-4× larger file, but only visibly better on large screens (50+ inches) at close viewing distance. vs 8K: 4K is the practical consumer ceiling in 2026 — 8K is rarely worth it. About 350-700 MB per minute at CRF 22-24 with H.264. A 5-minute 4K clip lands at 1.5-3.5GB before compression, 1-2GB after CRF 24 compression. Expect to use H.265 or AV1 for practical 4K streaming — H.264 4K files are very large. Optimal for 4K TVs, 4K monitors (27+ inches), and future-proofing archival. Looks identical to 1080p on phones and small laptops at typical viewing distances. Wasted on screens smaller than 27 inches unless viewer sits very close. The output is a universally-compatible MP4 file with H.264 video + AAC audio, ready for upload anywhere.
- 1Why 4K? 4K (2160p / UHD) is the highest common consumer resolution. 4K is worth it for home theater, large-screen viewing (50+ inches), professional video production, and future-proofing important archives. For most web and social media use, 4K is overkill — but it's the right choice for high-end content where every detail matters.
- 2File size: About 350-700 MB per minute at CRF 22-24 with H.264. A 5-minute 4K clip lands at 1.5-3.5GB before compression, 1-2GB after CRF 24 compression. Expect to use H.265 or AV1 for practical 4K streaming — H.264 4K files are very large.
- 3Streaming requires Streaming 4K H.264 requires 25+ Mbps — most home wifi can sustain this. Netflix/YouTube use H.265 or AV1 for 4K to bring it down to 15-25 Mbps. Mobile 4G struggles with 4K streaming; 5G handles it.
- 4vs 1080p: 4× more pixels, ~3-4× larger file, but only visibly better on large screens (50+ inches) at close viewing distance. vs 8K: 4K is the practical consumer ceiling in 2026 — 8K is rarely worth it.
- 5Local processing means no upload bandwidth and no server storing your video.
- 6You get explicit CRF control over the quality/size trade-off, rather than trusting platform re-encoders to make the call.
Three steps, no account needed
From raw footage to shareable MP4 in seconds — all in your browser.
Upload your video
Drag-and-drop or click to browse. Files are processed locally — nothing is uploaded to any server.
Pick quality
Use the recommended preset or fine-tune CRF / resolution in advanced settings.
Download
Compression runs entirely in your browser. Grab your smaller MP4 in seconds — no account, no watermark.
Why people choose this compressor
Built for everyday use — fast, private, and free forever.
100% Browser-Based
Your video never leaves your device. No upload, no server-side processing, no privacy concerns.
No Watermark
Output is clean H.264 MP4 — no logos, no overlays, no time limits baked in.
Free & Unlimited
No sign-up, no credit card, no daily cap. Compress as many videos as you need.
Fast FFmpeg Engine
Powered by FFmpeg compiled to WebAssembly — the same engine professionals use, now in your browser.
Universal MP4 Output
Output is H.264 + AAC in an MP4 container — plays everywhere, uploads everywhere.
Cross-Platform
Works on Windows, macOS, Linux, iOS, and Android — any modern browser.
Who uses this tool
Web video creators
Match what platforms actually serve — 4K is preferred by YouTube, Vimeo, and most streaming services.
Email & messaging
About 350-700 MB per minute at CRF 22-24 with H.264. A 5-minute 4K clip lands at 1.5-3.5GB before compression, 1-2GB after CRF 24 compression. Expect to use H.265 or AV1 for practical 4K streaming — H.264 4K files are very large.
Mobile viewing
Optimal for 4K TVs, 4K monitors (27+ inches), and future-proofing archival. Looks identical to 1080p on phones and small laptops at typical viewing distances. Wasted on screens smaller than 27 inches unless viewer sits very close.
Bandwidth-limited viewers
Streaming 4K H.264 requires 25+ Mbps — most home wifi can sustain this. Netflix/YouTube use H.265 or AV1 for 4K to bring it down to 15-25 Mbps. Mobile 4G struggles with 4K streaming; 5G handles it.
Frequently asked questions
4K (2160p / UHD) is the highest common consumer resolution. 4K is worth it for home theater, large-screen viewing (50+ inches), professional video production, and future-proofing important archives. For most web and social media use, 4K is overkill — but it's the right choice for high-end content where every detail matters. vs 1080p: 4× more pixels, ~3-4× larger file, but only visibly better on large screens (50+ inches) at close viewing distance. vs 8K: 4K is the practical consumer ceiling in 2026 — 8K is rarely worth it. This is why 4K remains the right choice for its target use cases despite newer formats and higher resolutions being available.
Other tools you might need
MP4 Compressor
Compress MP4 files locally with smart H.264 CRF encoding. No upload, no watermark, free. Reduce file size 50-80% in seconds — works on any device with a modern browser.
Compress Video for Instagram
Hit Instagram's spec sweet spot — 1080×1920 for Reels and Stories, H.264 MP4. No upload, no watermark, runs entirely in your browser.
Compress Video for TikTok
Hit TikTok's 1080×1920 H.264 sweet spot so the algorithm doesn't re-encode your clip and kill quality. No upload, no watermark, runs in your browser.
Compress Video Under 50MB
Shrink your video to fit under 50MB with adaptive bitrate. 50MB sits between email limits (25MB) and full messaging compatibility. It's the limit for Discord N Browser-based, free.