What is the difference between download and upload speed?
Who this page is for
Households comparing package leaflets, running speed tests, or wondering why sending files feels slower than browsing.
Plain-English definitions
- Download
- Traffic from the internet to your devices, such as web pages, streams, and app updates.
- Upload
- Traffic from your devices to the internet, such as video call video, cloud backups, and sending large files.
- Asymmetric line
- A line where download and upload caps differ. Common on many consumer broadband products.
Why upload matters
Video calls, cloud backups, and sending large attachments lean on upload. If upload is low, those tasks can struggle even when download looks fine.
How to measure upload
Pulse measures upload as well as download; run a Standard or Thorough test for the fuller picture.
See also: Does UKSpeedTest measure upload speed?
What to do next
- Run Pulse for download, latency, and jitter on a fair setup.
- If uploads feel slow, test upload separately and note your package’s stated upload range.
- If homeworking needs high upload, compare products that advertise higher upload on BroadbandSwitch.uk or partner sites when you are ready to buy.
Pulse measures download, upload, ping and jitter in your browser, and grades how your ping holds up when the line is busy. See our upload guide.
Compare broadband deals when your line is too small for what you do: live deals at your postcode on BroadbandSwitch.uk, lowest monthly price first, from 30+ UK providers.
UK rights and switching: start with Ofcom’s broadband guidance for personalised speed estimates, switching, and complaints.
Example scenario
Download tests at 60 Mbps but video calls freeze. You check upload separately and find 3 Mbps upload while four devices back up photos. You pause backups and consider a product with higher upload.
FAQ
Why is upload slower than download?
Many retail broadband products are designed with higher download capacity. Technology and product choice both play a role.
Can Pulse show upload soon?
Scope is described in our upload answer page. For now, use other tools for upload.
Why does my upload matter if I mostly browse?
Browsing is light, but cloud backup, video calls, and sending photos rely on upload. When upload is saturated, everything can feel sluggish.
Can I compare upload on Pulse?
Yes. Since October 2026 Pulse measures upload as well as download, so you can compare both against your package.
Is symmetric broadband worth paying for?
It depends on your workload. Heavy outbound transfers or high-quality live streaming from home may justify it more than casual browsing.
Does a speed test website show both directions?
Some do. Read the methodology on whatever tool you use so you know what is being measured.
Related guides
- How important is upload speed for video calls?
- Why are my file uploads slow on broadband?
- What does Mbps mean for my broadband?