Guides on getting a photo, a PDF or an upload accepted — the questions the tool pages deliberately leave alone.
Cropping to a square takes seconds on any phone. Getting a 2x2 photo accepted depends on head size, pixel count and file rules that differ for passports, visas and USCIS. The real numbers, and the quickest way to hit them.
WhatsApp publishes no pixel size for a profile photo — only the instruction to move and resize a circle. Here is the square to upload, the 1:1 ratio, the cm and inch conversions, and the margin that stops your head being cut off.
Instagram documents aspect ratios, not photo sizes, and admits it resizes and compresses what you upload. Here is what its Help Center really says for posts, stories, reels, carousels and profile pictures.
300 DPI is the right answer for a photo print and the wrong one for a poster seen from across a room. The DPI to use for photos, posters, stickers, shirts and digital art, and the pixel counts behind each, so nothing comes back soft.
Your own photos carry a GPS position you can read in a few taps; photos sent through WhatsApp, Instagram or Snapchat almost never do. Where to look on each phone and computer, which apps keep the location, and what to try when it is gone.
Where OCR actually lives on iPhone, Android, Windows, Mac, Word, Google Docs and Excel — with the version numbers and file limits each vendor documents, and the browser route when you cannot install anything.
WhatsApp strips it, iMessage keeps every byte, Discord does half a job and Telegram depends on which button you pressed. App by app, what happens to the location, date and camera details inside a photo when you send it.
It was sharp on your phone and mush on theirs. Nothing broke: the app re-encoded it. What WhatsApp, iMessage, text messages, TikTok and Instagram each do to a video, why iPhone-to-Android is the worst case, and how to keep it sharp.
The message never says what the limit is. Here are the actual numbers for Gmail, Outlook, WhatsApp, iMessage, Messenger and Discord, why a phone clip blows past them so fast, and the three honest ways to get under.
No passport photo carries an expiry date. What every authority sets instead is a maximum age — six months in the US and Canada, one month in the UK — and the rule behind all of them is likeness, not the calendar.
Windows has no built-in PDF compressor. Here is what the tools you already have actually do — the Word export option that works, the ZIP menu item that does not, and what Print to PDF really produces.
SVG for the master, PNG when SVG is refused, and almost never JPG. A practical guide to which logo file to hand a printer, a developer or a client — and why you cannot make an SVG out of a PNG.
Gmail and Outlook.com allow 25 MB, work Exchange accounts 10 MB — and base64 encoding eats a third of whatever you send. What the real limits are, and what to do when a file will not fit.
The rules allow a home passport photo in more places than you would think — but the shadow behind you, not your expression, is what usually fails it. What the US and UK rules actually say, and the setup that works.
Photographs go in JPG, everything else goes in PNG — that settles most of it. Here is why, with real numbers, plus the destinations where the answer flips: printing, websites, email signatures and social.
"Smaller" means two different things: fewer pixels or fewer bytes. Here is what actually works on each device, what iPhone genuinely cannot do, and why converting HEIC to JPG makes the file bigger.
Eyes closed, a tilted head and a lie-down shot are all explicitly allowed for infants — but the US and the UK relax different rules. The exact wording from 8 FAM 402.1 and GOV.UK, and the safe overlap between them.
The United States allows a natural smile. The UK, Canada, New Zealand and Germany want your mouth closed. Here is what each authority actually writes, why the rules disagree, and which parts of a photo a tool can check for you.
Two very different operations are both called compression. One cannot lose anything; the other loses something every time. Which one you are running decides what you are risking — and why zipping a folder of photos saves nothing.
300 DPI is a ratio, not a resolution — it means nothing until you know the print size. What the number does, what the DPI field in a file does not do, and when 300 DPI genuinely is a resolution.
You can wear your hair down for a US or UK passport photo, and neither country needs your ears visible. The real issue is that hair changes your chin-to-crown measurement.
There is no universal number. Visa portals want 40 KB to 1 MB, web images 100–300 KB, email under 5 MB, and print is measured in pixels instead. Here is each one, and how to hit it without wrecking the photo.
macOS has a one-click compressor in Preview that cannot aim at a size, and iOS has none at all — the Files app's Compress button makes a .zip. Here is what each device really does, and what to use when neither is enough.
Kilobytes are the second question — the format decides almost everything. Working targets: 10–50 KB for a website header, 1–10 KB for a favicon, under 20 KB for an email signature, and nothing at all for print.
Print quality is decided by pixels, not kilobytes. The formula is print size in inches × 300: a 4 × 6 needs 1200 × 1800 px, which any phone photo already has. File size only tells you whether it has been over-compressed.
Keep the images in an email signature under about 50 KB in total, and under 20 KB each. The reason is Gmail's 102 KB clipping threshold, not aesthetics — and it applies to every message you send, forever.
Most job portals cap a resume at 2 MB, some at 1 MB. A text-only resume should be well under 500 KB, so if yours is 6 MB something specific is wrong — and the usual fix quietly breaks the thing that reads it.
A printed passport photo has no file size. For uploads the number is set by the portal, and the windows are narrow: 40-120 KB for China, under 240 KB for the DS-160, up to 5 MB for the UAE. Here is the real list.
A ten-page text PDF should be 50-300 KB. If yours is 40 MB it is one of four things, and three of them are images. How to tell which in five seconds, and what each fix actually costs.
Upload errors come from three different limits: file weight, pixel dimensions, or file format. Here is how to tell which one stopped you, what the real numbers are on the forms people hit, and how to get under it.
The iPhone has saved photos as HEIC by default since 2017 because it halves the file size. Here is why so much software still rejects it, how to switch the camera back to JPG, and why converting makes the file bigger.
Most rejections come down to shadows, the crop, or a file that misses the upload spec. Here is what each authority actually checks, and what you can verify yourself before submitting.
"Photo upload service unavailable" and "photo does not meet requirements" are different problems with opposite fixes. How to tell which one you have, and the exact numbers CEAC checks.