Blog
Short, practical guides for checking your hardware and fixing what the tests find.
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Tools
How to create an ICO file from a PNG image
Turn a PNG into an ICO file in your browser, keep transparency where possible, and choose an image size that looks sharp as a Windows icon or favicon.
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Tools
Why transparent images lose transparency as JPG
Learn why JPG turns transparent areas solid, which formats keep them clear, and how to convert an image without flattening its background.
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Tools
How to convert GIF images to JPG, PNG, or WebP
Convert one or more GIF files to JPG, PNG, WebP, or another format in your browser, and choose the right option for animation and transparency.
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Tests
Is your Wi-Fi weak, or is it the internet?
Learn how to tell whether weak Wi-Fi or your internet connection is causing slow pages, buffering, or dropouts, then choose the right fix.
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Tests
Why your browser can't tell you how much RAM you have
See why a browser reports only an estimate of your RAM, what that number means, and where to check the exact amount in Windows or macOS.
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Tests
How to test every key on your keyboard
Check every key that a browser can detect, spot keys that fail or work only in combinations, and learn what to do about Fn and system keys.
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Tools
How to open a CSV with more than 1 million rows
Open a CSV with over 1 million rows in your browser, understand spreadsheet row limits, and troubleshoot slow loading or files that will not open.
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Tools
How to remove duplicate rows from a CSV file
Remove identical rows from a CSV in your browser, check what counts as a duplicate, and save a clean copy without changing the original.
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Tools
How to edit a huge CSV without opening Excel
Open and edit a large CSV in your browser, find or sort rows, remove duplicates, and save a corrected copy without launching Excel.
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Tools
How to find and replace values in a large CSV
Find a value in a large CSV, check matching rows, edit the right cells, and save a clean copy without changing other data.
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Tests
How to test a used webcam before buying it
Check a used webcam's image, focus, frame rate, cable and mount before you pay, with a browser camera test and a short list of warning signs.
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Tests
Why your microphone sounds too quiet
Learn why your microphone sounds quiet, test its input level in your browser, and work through settings, placement, and app fixes that can help.