Compressed Video Won't Play? Causes and Fixes
Fix a compressed video that will not play, has no sound, or will not open on a phone, Mac, TV or editing app.
Read morePractical, plain-English guides that explain what your results mean and how to fix common problems. Each guide sits alongside the tool it relates to, so you can test, read the fix, and test again.
Fix a compressed video that will not play, has no sound, or will not open on a phone, Mac, TV or editing app.
Read moreTypical savings by type of video, why phone videos shrink so much, and how many megabytes a minute takes at 1080p, 720p and 480p.
Read moreEight tips to keep videos sharp while making them smaller: start from the original, match resolution and frame rate, trim and check before sharing.
Read moreOpen the Internet Speed Calculator →
How many phones, TVs and smart-home gadgets a router can handle, why lots of devices slow WiFi even on a fast plan, and how to fix it.
Read moreHow much upload you need for video calls, working from home, live streaming, cameras and cloud backups, and how long big uploads take.
Read moreWho really benefits from 1 Gbps broadband, why WiFi often can't deliver it, and how to check whether you're paying for speed you don't use.
Read moreConvert Mbps to MB/s, see why 100 Mbps downloads at about 12 MB/s, and work out download times with a quick calculator.
Read moreOpen the Free Barcode Generator →
Standard and minimum barcode sizes, magnification, clear margins and how to print barcodes at the right size.
Read moreCompare EAN-13, UPC-A, EAN-8, UPC-E, Code 128, Code 39 and ITF-14, and choose the right barcode for products, cartons, shipping or stock.
Read moreHow product barcodes work, how to get GS1 numbers (GTINs), why resold barcodes can be rejected, and how to make and print your barcode.
Read morePrint barcode labels on A4 or US Letter sticker sheets with product names and prices, line them up and check they scan.
Read moreOpen the Internet Speed Test →
How to test your broadband properly, rule out home problems, gather evidence and complain, plus your rights in the UK, EU, US, Australia and Canada.
Read moreGet accurate, repeatable speed test results: wired vs WiFi, what to switch off, choosing a server, when to test and how to read the results.
Read moreCompare mesh WiFi, WiFi extenders, powerline adapters and wired access points for fixing WiFi dead spots, and pick the right one for your home.
Read moreWhat ping, jitter, latency and packet loss mean, what counts as good for gaming and video calls, and how to lower them.
Read moreHow much download and upload speed you need for streaming, gaming, video calls and working from home, with recommendations by household size.
Read moreWhy games lag and video calls freeze when someone downloads or uploads, how to test for bufferbloat, and how to fix it with SQM and QoS.
Read moreBroadband fine in the day but slow at night? How to tell whether it's provider congestion, your household or WiFi interference, and what to do.
Read moreFind out whether slow WiFi is your router, your devices or your broadband, then fix it: router placement, 2.4 vs 5 GHz, channels, interference, mesh and more.
Read moreOpen the Free QR Code Generator with Scan Checks →
Static QR codes never expire, but dynamic ones can stop working when a subscription ends. Learn the difference and how to make a free code you can still update.
Read moreScan QR codes with your phone camera, from a screenshot or photo, or on a computer, plus what to do when a code won't scan and how to stay safe.
Read moreLet guests join your Wi-Fi with a scan: make a Wi-Fi QR code, print a sign, share it from your phone and keep your network secure.
Read moreWhy QR codes fail to scan and how to fix them: contrast, size, quiet zone, logos, colours and printing, plus a simple rule for choosing the right print size.
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A tool gives you a number; a guide helps you understand what it means and what to do next. Our guides explain the assumptions behind each result, the most common causes of problems, and practical steps you can take yourself.
Rules and services vary between countries. Where that matters, guides say which countries they cover. Guides provide general information, not professional or legal advice.