Practical guides, how-tos and comparisons to get the most out of our free online tools.
The extension is almost never the real problem. A .mov and a .mp4 are cousins from the same family of file formats, and what actually stops the video is the codec sealed inside it — usually HEVC. Here is how to tell the two failures apart, and when changing the box is enough.
Daniel Okonkwo · 14 min read
The quality slider cannot aim at a file size — that is not what it is for. But the limit and the length of your clip already fix the bitrate you are allowed to spend, and one division tells you whether the resolution you are using can possibly fit.
Daniel Okonkwo · 14 min read
You asked for 1:23 and got 1:21. Nothing is broken: a cut that does not re-encode can only land on a keyframe, and how far away the nearest one is depends entirely on what recorded the video. Here is how to know which you have and when to accept the drift.
Daniel Okonkwo · 7 min read
The conventions are not taste. A hyphen is the minus operator, so kebab-case cannot be an identifier in most languages - which is exactly why CSS and URLs use it. Plus the acronym round-trip that silently corrupts names, and the rule that fixes it.
Daniel Okonkwo · 12 min read
Each parent passes on one ABO allele — A, B or O — and Rh follows a separate gene. Here is every parent combination, which child types it can and cannot produce, and why this is not a paternity test.
Sofia Nunes · 7 min read
A formula-fed baby takes roughly 2.3 fl oz per pound of body weight per day in the first months, split across the day's feeds. Here is the table by age and weight, why breastfed babies are not measured this way, and the signs that outrank any number.
Sofia Nunes · 6 min read
A duplex scanner that took one side at a time, a stack fed upside down, a page that came out twice. Reordering is not the same operation as extracting pages, and knowing which one you are doing tells you what happens to everything that is not a page.
Daniel Okonkwo · 8 min read
You rotated the scan, saved it, and the recipient still opened it sideways. Nothing is broken — rotation in a PDF is an instruction rather than a change to the page, and instructions can be ignored. Here is when that happens and how to produce a file that cannot be misread.
Daniel Okonkwo · 8 min read
A landlord wants page 3. An accountant wants January. You need to send those pages and not the eleven others, and there is a trap: the obvious way leaves the removed pages inside the file you send.
Daniel Okonkwo · 11 min read
Best 8 of your last 20 score differentials, averaged, and no 0.96 multiplier — that disappeared in 2020. Here is the full chain from a gross 92 to a Course Handicap of 17, with the numbers worked out.
Aisha Karim · 7 min read
A 176 lb man benching 220 lb is intermediate, not strong. Here are the usual bodyweight multiples for bench, squat and deadlift, and why the labels mislead more often than they help.
Aisha Karim · 4 min read
Run as far as you can in twelve minutes, then read the distance against your age and sex. The same number also converts straight into an estimated VO2 max — here is the table and the formula.
Aisha Karim · 5 min read