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Each guide explains why a file causes trouble, which settings to pick and which tool to use.

Images & graphics

Images & graphics

HEIC photos from an iPhone: how to convert them to JPG

iPhones save photos as HEIC, a format some upload forms and apps don't accept. You can convert the files you already have to JPG in your browser and set the camera to save new photos as JPG.Images & graphics

How to make a 35×45 mm passport photo at home

Many countries use the 35×45 mm photo size, but the rules behind it differ. Before you take a photo at home, check what the office you're applying to asks for, including whether it accepts a photo you've cropped yourself.Images & graphics

How to prepare product photos for an online store

Shoppers see product photos side by side, in a grid and on the product page. This guide shows how to prepare a whole set with the same framing and background, at sensible dimensions and file sizes.Images & graphics

Image too large to upload: file size, pixels and format

An upload form can reject a photo for three different reasons: the file is too heavy, the dimensions are wrong, or the format is not accepted. Each one has a different fix, so first work out which rule the file breaks.Images & graphics

What to check before sharing a photo: EXIF data and what's in the frame

A photo can give away information in two ways: through metadata stored in the file and through what is visible in the frame. Check both before you send the file to a stranger or post it online.

PDF

PDF

How to crop white margins from a PDF

Wide white margins shrink the text on a phone screen and when you print on smaller paper. Cropping changes the visible area of the page, but whatever falls outside it stays in the file.PDF

How to prepare a PDF for email

Your PDF is too big to attach, or someone asked for a smaller copy. Find out what is taking up the space, remove pages nobody needs, compress, and look at the result before you send it.PDF

How to scan a document with your phone to PDF

A phone and decent light are enough to scan a document. The photo still needs to be straightened, cropped to the page, and saved as a PDF that the recipient can actually read.PDF

How to sign a PDF without printing it

You can put your handwritten signature into a PDF in a few minutes: draw it with your finger or mouse and drop it above the line. An image of your signature isn't a qualified electronic signature, though, so check what the recipient expects first.PDF

Why you can't select text in a PDF

You drag across a PDF and the whole page gets selected, pasted text comes out as gibberish, or Ctrl+F finds nothing. Each symptom has a different cause and a different fix.