Compress video for Twitter (X)
X re-encodes uploads harder than any other platform. Hand it a lean H.264 file and your video stops turning into pixel soup.
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.
Twitter (now X) is infamous for what it does to video quality: every upload is re-encoded for delivery, and the platform compresses aggressively — oversized files come out the other side blocky, smeared, and stuttery. Standard accounts also face hard limits: 512 MB and 2 minutes 20 seconds. The counter-move is the same one professionals use everywhere: compress on your own terms first, so X's encoder has an easy job instead of a demolition order.
The presets below aim for clean H.264 MP4 at sizes X's pipeline treats gently. Everything runs on your device — the file never uploads anywhere until you post it yourself — and a smaller upload also means a tweet that actually finishes posting on hotel Wi-Fi or mobile data instead of dying at 90 percent.
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 twitter — 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
Why does my video look terrible after posting to X?
X re-encodes every upload to its own delivery formats and bitrates, and it compresses harder than most platforms. Big, high-bitrate files lose the most in that squeeze. A moderately compressed H.264 MP4 gives X little left to crush, so much more of your quality survives the pipeline.
What are the actual upload limits on X?
For standard accounts: 512 MB and 2 minutes 20 seconds (140 seconds), MP4 or MOV. Premium tiers allow longer and larger uploads, but the re-encode behavior is the same — a lean upload still looks better after processing than an enormous one.
What format should I upload for the best results?
H.264 MP4 with AAC audio — exactly what this compressor outputs. It is the format X's pipeline handles most predictably, for both the web uploader and the mobile apps.
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.