Internet diagnostic tool
Upload speed controls how well your connection sends video, voice, files, livestreams, and remote-work data. Low upload is one of the most common reasons calls look blurry or unstable.
Run a quick browser-based diagnostic for calls, gaming, streaming, VPN, and remote work. Verdicts appear before raw technical numbers.
Measured from your browser to the nearest Cloudflare server with Cloudflare’s open-source speed test engine, so results reflect your connection to Cloudflare, not every site you use. Uses roughly 20–190 MB of data, more on faster connections, so use Wi-Fi if you are on a metered plan. Results are not sent back to Cloudflare. How we measure
Upload speed controls how well your connection sends video, voice, files, livestreams, and remote-work data. Low upload is one of the most common reasons calls look blurry or unstable.
For HD calls, aim for at least 3 Mbps upload. Livestreaming, cloud backups, and multiple users may need much more.
Many broadband plans are asymmetric, meaning download capacity is much higher than upload capacity.
Pause cloud backups, stop large uploads, use Ethernet, upgrade your plan, or switch providers if upload remains low.
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