Why is my upload speed much slower than download?

Your downloads may feel fast while sending a photo, backing up files, or joining a video call takes much longer. A much lower upload speed can be normal for your internet plan, but Wi-Fi problems, background transfers, or a provider issue can also cause it.

Use the Speed Test to measure download speed, upload speed, ping, and jitter. Then compare results under different conditions to narrow down the cause.

Test upload and download speed

1. Close apps and browser tabs that may be downloading or uploading large files. Pause cloud backups, file syncing, and game updates if you can.
2. Open the Speed Test on the device and network you want to check. The test exchanges test data with our server to measure your connection speed.
3. Run the test and note the download speed, upload speed, ping, and jitter. Speeds are usually shown in Mbps, or megabits per second.
4. Run it two more times, leaving about a minute between tests. Write down all three upload results rather than relying on one reading.
5. If possible, connect a computer to the router with an Ethernet cable and repeat the test. Also try another device on the same network to see whether the result follows the device or the connection.

For a useful comparison, keep the device in the same place and avoid changing several things at once. A wired result is especially helpful because it removes Wi-Fi signal quality as one possible cause.

What the result means

Upload is consistently slower, but download is close to your plan

Your internet plan may offer much less upload capacity than download capacity. For example, a plan might advertise 300 Mbps download and 10 Mbps upload. That is an asymmetric plan, and the difference alone does not mean something is broken. Check the upload speed listed for your plan, not just the larger download number.

Upload improves a lot over Ethernet

The internet service may be fine, while Wi-Fi is limiting the result. Distance from the router, walls, interference, or a weak connection between the device and router can reduce upload speed. Wi-Fi bars do not show your actual upload capacity.

Upload is poor on several devices, including over Ethernet

This points more toward the router, modem, service plan, or provider than one computer. If the result stays far below the upload speed your plan promises at different times, save the readings and contact your provider.

Results vary widely from one run to another

Another device may be using the connection, or the provider's network may be busy. A single test can also be affected by the test server, browser, or temporary network conditions. Repeat the test at a quiet time and compare the pattern.

Upload speed looks low in MB/s

Some apps show megabytes per second, written as MB/s, while speed tests usually show megabits per second, written as Mbps. There are 8 bits in a byte, so 10 Mbps is about 1.25 MB/s before network overhead. The two figures can look different while describing roughly the same transfer rate.

How to fix slow upload speed

1. Check your plan's upload limit. Look at your provider's account page or service agreement for the advertised upload speed. If your test result is close to that limit, a faster plan or a different service type may be the only way to get more upload capacity.
2. Pause other uploads. Cloud photo backups, video uploads, file sharing, and security camera feeds can use most of a connection's upload capacity. Pause them briefly, then repeat the test.
3. Test closer to the router. Try the test in the same room as the router. On Windows 11, open Settings › Network & internet › Wi-Fi to confirm which network is connected. On a Mac, open System Settings › Network › Wi-Fi. If a wired test is much faster, improve router placement or use Ethernet where practical.
4. Restart the router and modem. Unplug both devices, wait about 30 seconds, reconnect the modem, and wait for it to finish starting before reconnecting the router. Then run the test again. Avoid resetting the router to factory settings unless your provider or router instructions tell you to.
5. Check for a VPN or traffic limit. A VPN can send traffic through a slower route. If it is safe to do so, disconnect it briefly and retest. Check router settings for upload limits, parental controls, or quality-of-service rules that may reserve or restrict bandwidth.
6. Compare at another time. If upload is slow mainly in the evening, repeat the test early in the morning. A consistent time-of-day pattern can point to congestion outside your home.
7. Contact your provider with evidence. Give them the plan's advertised upload speed, your wired test results, the times you tested, and whether several devices were affected. Ask whether there is an outage or a line problem in your area.

Why upload and download plans differ

Many cable and older broadband plans reserve more capacity for downloads because households often receive more data than they send. Fiber plans are more likely to offer similar upload and download speeds, although the exact service depends on the provider and plan. The advertised maximum is not a guarantee that every test will show that exact number, but repeated results well below the plan's upload figure are worth investigating.

For file transfers, remember that the receiving service can also set limits. If your speed test looks normal but one website or cloud app uploads slowly, try a different service or file. That helps separate a connection problem from a limit on the service receiving your file.