Speed for what you do
Why does upload speed matter? Upload vs download, measured
Upload speed is how fast your device sends data to the internet. It carries your face on a video call, your photos to a cloud backup and your voice in a game. In HIZTESTI's fixed-line measurements from Turkey the typical upload is 14.1 Mbps, just 31% of the typical download. For video calls, backups and streaming, the bottleneck is often upload, not download.
- 14.1 Mbps
- Typical fixed-line upload
- 31%
- Typical upload as a share of download
- 32.7%
- Measurements with upload below 10 Mbps
- 17.6%
- Measurements with upload close to download
Why aren't download and upload equal?
Most home lines are built asymmetric: most of the capacity goes to traffic flowing towards you and a small part to traffic leaving you. The logic is simple; people mostly watch, download and browse. Copper lines (ADSL, VDSL) and cable TV networks leave little room for upload. Fibre can technically carry high speeds both ways; whether a plan is symmetric is the provider's choice.
Only 17.6% of our measurements have upload close to download. Those are most likely symmetric fibre plans. Everywhere else, upload stays a small fraction of download.
Where does upload become the bottleneck?
| What you're doing | Why it's upload | What happens when it's short |
|---|---|---|
| Video calls | Your video and voice go out | Others see you blurry or frozen, audio cuts out |
| Cloud backup (photos, video) | Files leave your phone for a server | Backups take hours and slow everything else |
| Live streaming, screen sharing | Video leaves you continuously | Quality drops or the stream stalls |
| Attaching large files to email | The file is uploaded first | Sending takes a long time |
| Online gaming | Your moves and voice chat | Little data, but a full upload makes latency spike |
For video calls, the most reliable figures come from the app itself. Zoom recommends the following bandwidth for group video calls:
“For 720p HD video: 2.6Mbps/1.8Mbps (up/down). For 1080p HD video: 3.8Mbps/3.0Mbps (up/down).”[1]
In 90.1% of HIZTESTI's fixed-line measurements upload is above 3 Mbps, so most lines can carry a single call. Trouble starts when several things want upload at once: a phone backing up photos while you're in a meeting, or a second call in the house.
Why does everything stall when upload is full?
When upload is saturated it isn't just uploads that slow down; every response takes longer. Even opening a web page means sending small requests out, and those requests queue behind the backlog. That's why browsing feels heavy the moment a backup starts.
This effect is called bufferbloat; here's how to reduce it: Why the internet slows under load
Where does your upload sit?
Run a test first to see where your result sits. Start a speed test
- Check upload separately when choosing a plan. Between two plans with the same download, the symmetric one makes a real difference if you work from home or stream.
- Schedule big backups for the night so they don't compete with your calls.
- Pause cloud sync during a call. Most apps let you do it with one tap.
The data in detail: charts and diagrams
Spread of download and upload speeds
| Slowest 10% | Typical | Fastest 10% | |
|---|---|---|---|
| Fixed · download | 6.6 Mbps | 43.5 Mbps | 198.0 Mbps |
| Fixed · upload | — | 14.1 Mbps | 52.1 Mbps |
| Mobile · download | 3.0 Mbps | 23.7 Mbps | 117.3 Mbps |
| Mobile · upload | — | 11.9 Mbps | 36.9 Mbps |
HIZTESTI measurements · 1 Jul – 28 Sep 2026 · fixed and mobile
Frequently asked questions
- What's the difference between upload and download?
- Download is data coming from the internet to your device; upload is data going from your device to the internet. Watching video relies on download; showing yourself on a video call relies on upload.
- Why is my upload so much lower than my download?
- Most lines are deliberately asymmetric. In HIZTESTI's measurements typical upload is only 31% of download. Symmetric speeds are usually offered on fibre plans.
- Is my upload enough for video calls?
- According to Zoom, a high-definition call needs a few Mbps of upload. 90.1% of our fixed-line measurements are above that. The problem is usually a backup or a second call running at the same time.
- How can I increase my upload speed?
- A cable and an idle line fix the measurement but not your line's ceiling. Raising the ceiling means a plan with higher (ideally symmetric) upload.
Sources
References
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