Help
Straight answers to the questions people actually ask — what works, what does not, and where the common advice is wrong. Each page answers one question. You do not need any of our apps to use them.
How to merge PDF files on an iPhone
iOS has no built-in merge. Here is what actually combines PDFs on iPhone and iPad, and what to check afterwards.
Why is my PDF so large, and how do I shrink it?
Almost always the images. What compression actually does to a PDF, how much it saves, and when it will not help at all.
How to properly hide information in a PDF
Drawing a black box over text does not remove it. What real redaction does, and the one-second test that proves it worked.
Why can't I search a scanned PDF? (and how to fix it)
A scan is a photograph — the device sees pixels, not letters. What OCR adds, how accurate it is, and what still defeats it.
How do you photograph a document so it looks scanned?
Light and angle do more than any app. What makes a photo of paper unusable for OCR and for officials.
How do people get different fonts in their Instagram bio?
They are not fonts at all. What those characters really are, why some show as empty boxes, and the accessibility cost.
Why do my video calls break up when my internet speed is fine?
Speed is not the problem. Jitter — the variation in latency — is what breaks calls, and it does not show up in a download test.
Why is my Wi-Fi slower than the speed I pay for?
Your plan speed is measured at the router. Everything after that is physics — and one test tells you which side the problem is on.
Why does my speed test give a different result every time?
What the number actually measures, why the server matters, and the test that tells you more.
Why won't my QR code scan?
Usually size, contrast or the missing quiet zone. The rule of thumb that gets the size right first time.
I keep forgetting where I parked — how do I stop?
It is a memory-encoding problem, not a navigation one. Why GPS fails in car parks and what actually works instead.
Can my iPhone be used as a TV remote?
Only over the network — no iPhone has ever had an infrared blaster. What that means for old TVs, and why discovery fails.
How do you get water out of a phone speaker?
A low tone pushes it out. Why rice does nothing, and what actually damages a wet phone.
Do offline translation apps actually work?
Well enough to get by, and the failures are predictable. What changes when there is no connection.
Do screens damage your eyes?
No good evidence they cause permanent damage — but digital eye strain is real. What the research supports, and what it does not.
Why do I keep forgetting to take my medication?
It is a design problem more than a discipline one. What the adherence research points to, and the anchor that works better than an alarm.
How accurate are period and cycle predictions?
Prediction is arithmetic on your history, nothing more. What that means for accuracy — and why it is not a contraceptive method.
How are pregnancy weeks counted, and how accurate is a due date?
Counting starts before conception, which confuses almost everyone. And a due date is a midpoint, not a deadline.
Do affirmations actually work?
Sometimes — and the conditions matter. The research also found a way they can make things worse.
How loud is too loud for your hearing?
85 decibels is the line, and the time you can safely spend halves with every 3 dB above it.
What is colour blindness actually like?
Not black and white. What changes, how common it is, and the design mistake it exposes.
Why does my logo look blurry when I enlarge it?
Because it is a raster file, whatever it is named. The difference between vector and raster, and why printers ask for one specific thing.
Why does my sticker have a white box around it?
Because it was saved as JPEG. The one file-format rule that decides whether transparency survives.
What size should an iPhone wallpaper be?
Match your model's native pixels — and keep the important part out of the top third, where the clock lives.
How do you remove the background from a photo?
What makes a cutout clean or ragged, and the one detail that ruins it after you have exported.
Why does the same image look different on two screens?
Calibration, colour profile and gamut. Which differences you can fix and which you cannot.
How long does it really take to form a habit?
Not 21 days — that number comes from a 1960s observation about surgery patients, not from habit research.
Why is the exchange rate I get worse than the one I looked up?
The quoted rate is the mid-market rate and nobody trades at it. Where the real cost hides, and the one choice that saves the most.
Why do exchange rates change all the time?
What actually moves a currency, why the news explanation is usually wrong, and what it means for you.
How do I record better audio on a phone?
Distance and room do more than any microphone. Four changes that cost nothing and fix most bad recordings.
Why does converting a file twice make it sound worse?
Generation loss. The difference between remuxing and transcoding, and why you should always convert from the original.
Why does my voice sound different in recordings?
Because you have never actually heard your own voice the way everyone else does.
Why do videos take up so much space?
Resolution, frame rate and codec multiply together. Which one to change first, and what it costs.
How do you drive safely in fog?
The instinct fog triggers is the wrong one. Why full beams make it worse, and where fog forms first.
Why does my guitar keep going out of tune?
Temperature, new strings and how you turn the peg. Plus why a tuner can read perfect while chords still sound wrong.
Can you actually feel music through vibration?
Yes — and it maps onto how hearing and touch genuinely overlap in the body.
Why do my job applications get rejected before a human sees them?
Applicant tracking software parses your CV into fields — and certain layouts break the parser entirely.
Why do productivity systems stop working after a few weeks?
Capture outpaces review. Three structural reasons lists collapse — and what actually fixes each one.
Why can I never find the note I wrote?
Because it was written by someone who had the context, and found by someone who lost it. One habit fixes most of it.
What should you look for in an app for a young child?
The absences matter more than the features. Notes for parents, including why ads are a different problem at this age.
Is drawing on a tablet as good as drawing on paper for children?
Both do things the other cannot. What the research points to, and what to look for in a drawing app.
Where do restaurants lose money without noticing?
Three places, all invisible from behind the counter and all visible in reporting. Plus the four numbers that actually explain profitability.