Browser
Is your browser up to date?
Quick checks that run right here in your browser, with nothing to install, plus a health check of your computer or phone from the reports it already keeps. Nothing leaves your device until you click, and everything that does is listed in the outbound log.
Choose “Save as PDF” in the print window.
If the button does nothing, this browser is too old to run the page. That alone is a sign it needs updating.
Checks
Connection
Does the connection use modern encryption?
DNS
Who answers your DNS lookups?
WebRTC leak
Can sites see your real IP through WebRTC?
Trackability
How easy is this browser to track without cookies?
Password
Has this password shown up in data breaches?
Left your deviceStayed on your device
Internet speed
How fast is your connection right now?
Runs only when you press GO. Uses up to about 250 MB of data on very fast connections, much less on slower ones.
System report
Windows already keeps a crash history, a battery report and a system summary. Save them with the steps below and PC Check reads them right here in your browser. The files never leave your device.
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Crash history
- Press Win + R, type
perfmon /reland press Enter. - At the bottom of Reliability Monitor, click “Save reliability history…” and save the
.xmlfile.
- Press Win + R, type
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Battery (optional, laptops)
- Press Win + R, paste this command and press Enter:
powercfg /batteryreport /output "%USERPROFILE%\Downloads\battery-report.html" - It saves battery-report.html in your Downloads folder; it changes nothing.
- Press Win + R, paste this command and press Enter:
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System info (optional)
- Press Win + R, type
msinfo32and press Enter. - Choose File > Export and save the
.txtfile. It can be large; only the first part is read.
- Press Win + R, type
Analyze runs on this device. Nothing is uploaded, so nothing is added to the outbound log.
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System
Shows the kernel version and which Linux you run.
uname -a; cat /etc/os-releaseIt only reads; it changes nothing.
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Errors since this start-up
Lists error messages logged since the computer was switched on. LC_ALL=C makes this one command print in English.
LC_ALL=C journalctl -b -p 3 -o short --no-pagerIt only reads; it changes nothing.
If it says you are not seeing messages from the system, your account can only see part of the log; the results will say so.
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Previous start-ups
Lists the last five start-ups and the errors from the one before this, to spot a crash or freeze.
LC_ALL=C journalctl --list-boots --no-pager | tail -5; LC_ALL=C journalctl -b -1 -p 3 -o short --no-pagerIt only reads; it changes nothing.
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Battery (laptops, optional)
Shows how much charge the battery holds compared with new. On a desktop it prints nothing; leave the box empty.
upower -i $(upower -e | grep BAT)It only reads; it changes nothing.
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Disks
Shows how full each disk is.
LC_ALL=C df -h; LC_ALL=C lsblk -o NAME,SIZE,TYPE,MOUNTPOINTIt only reads; it changes nothing.
Analyze runs on this device. Nothing you paste is uploaded, so nothing is added to the outbound log.
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System Information
- Hold the Option key and click the Apple menu at the top-left of the screen, then choose System Information. (Or open Finder > Applications > Utilities > System Information.)
- Choose File > Save… and save the report to your Desktop. It ends in .spx and can take a minute.
- Choose that .spx file below, or drop it here.
The file also lists your Mac’s serial number and network names. PC Check reads only the model, macOS version, memory, disks and battery, and keeps none of the rest.
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Crash and panic reports (optional)
- In Finder choose Go > Go to Folder…, enter
/Library/Logs/DiagnosticReportsand press Return. - Sort by Date Modified and select the files from the last 30 days whose names end in .panic, .ips or .crash (hold Command to select several). Drag them onto the box below.
- Do the same with
~/Library/Logs/DiagnosticReportsfor crashes of your own apps.
Go to Folder is a Finder window, not a command line.
You can also open the Console app (Applications > Utilities), choose Crash Reports, Control-click a report and choose Reveal in Finder.
An empty folder means no crashes were recorded. That’s good news; skip this step.
- In Finder choose Go > Go to Folder…, enter
Do these steps on the Mac. You can read them here and open this page on the Mac later.
Analyze runs on this device. Nothing is uploaded, so nothing is added to the outbound log.
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Save the logs and choose them (optional)
- In the same screen, tap Analytics Data.
- Look for names from the last 30 days that start with panic-full, JetsamEvent or the name of an app. Skip names that start with Analytics or log-aggregated: they are usage statistics, not problems.
- Tap a log, tap the Share button at the top right, choose Save to Files and pick a folder such as On My iPhone > Downloads. Repeat for each log you want.
- Tap the box below, choose Choose Files, open that folder, tap Select, tap the logs and tap Open.
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Battery health (optional)
- Open Settings > Battery > Battery Health (on iPhone 14 and earlier: Battery Health & Charging).
- Type the Maximum Capacity percentage below.
On an iPad without a Battery Health screen, leave this empty.
Analyze runs on this device. Nothing is uploaded, so nothing is added to the outbound log.
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Turn on Developer options (once)
- Open Settings > About phone (on Samsung: About phone > Software information).
- Tap Build number 7 times. Enter your PIN if asked. You’ll see “You are now a developer”.
Menus differ between phone makers. If you can’t find an item, type its name in the search box at the top of Settings.
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Take a bug report
- Open Settings > System > Developer options (on many phones Developer options is at the bottom of Settings).
- Tap Take bug report, choose Interactive report and tap Report.
- Wait 1 to 3 minutes. A notification says the bug report is ready.
- Tap the notification. If Android warns that bug reports contain personal data, that is expected: continue. In the share menu choose Files, My Files or Save to device, and save the .zip file in Downloads.
The bug report contains personal data, such as app names, network names and parts of your logs. Don’t send it to anyone. PC Check reads only the parts it needs, right here on this phone, and never uploads it.
An Interactive report may include a screenshot; PC Check never opens it.
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Choose the bug report
- Tap the box below and pick the bug report .zip from Downloads.
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Turn Developer options off again
- When you are done, open Settings > System > Developer options and turn off the switch at the top (Use developer options).
- Delete the bug report from Downloads: it holds personal data and you no longer need it.
Analyze runs on this phone. Nothing is uploaded, so nothing is added to the outbound log.
How it works
Password: your browser turns the password into a code (SHA-1 hash) and sends only the first 5 characters. Pwned Passwords returns hundreds of codes that start the same way, and the comparison happens here. Not even the service knows which password you checked.
DNS: your browser looks up 20 test addresses that exist only for you. The bash.ws service records which DNS servers made those lookups and compares them with your connection’s network.
Connection: Cloudflare reports how your browser connected to it, including the TLS version and whether the site name was hidden (ECH).
Browser: the version is read right here and compared with the latest version published by Google and Mozilla.
This page uses no cookies, no analytics and no third-party scripts.
Services used: Pwned Passwords, Cloudflare and bash.ws.