Compress video for YouTube
YouTube's cap is 256 GB — the real enemy is upload time. Compress to YouTube's own recommended bitrates and post in a fraction of the time.
Drop your video here
or
MP4, MOV, WebM, MKV, AVI and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
Honesty first: YouTube's size limit is 256 GB or 12 hours (15 minutes until you verify your account by phone), so almost no real file is blocked by the cap. What actually hurts is the pipeline — a 40-minute 4K screen recording can be 20 GB, take hours to upload on home internet, and then wait in processing. And YouTube re-encodes every upload anyway, down to its own delivery bitrates.
That is the lever this page pulls: YouTube publishes recommended upload bitrates — around 8 Mbps for 1080p and 5 Mbps for 720p at standard frame rates — and bytes you spend above them are mostly thrown away during YouTube's re-encode. The presets below match those recommendations for typical video lengths, so you upload what YouTube will keep, not what it will discard. Compression runs on your own device; only the finished file goes to YouTube.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Pick your target
Use the presets above — this page's defaults are tuned for compress video for youtube — or type any size.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
What is YouTube's actual upload limit?
256 GB or 12 hours, whichever comes first, for verified accounts — unverified accounts are limited to 15 minutes of length until they verify by phone. In other words, size is almost never what blocks a normal upload; time is what it costs you.
Does compressing before upload reduce final quality on YouTube?
Not meaningfully, if you stay at or near YouTube's recommended bitrates — YouTube re-encodes every upload to its own formats, and bytes above its recommendations are largely discarded in that re-encode. A clean 8 Mbps 1080p upload and a 60 Mbps original usually look the same to viewers after processing.
What resolution should I upload for best results?
Upload at the resolution you produced — the presets keep it whenever the byte budget allows, preferring to shorten the gap with bitrate rather than downscale 1080p footage. For screen recordings, 1080p at the 8 Mbps class keeps text crisp.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.