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Joining PDFs is the one job every office needs and every website wants your files for. Here is how the merge actually works, what it does to your document, and how to do it in the browser.
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Most oversized PDFs are oversized for one reason: photographs. Learn to tell a scan from a text document, pick a sensible compression level, and get under the 25 MB limit without wrecking the file.
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MOV and MP4 are not two kinds of video. Understanding the difference explains why your clip refuses to open, and why converting it usually costs nothing in quality.
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Background removal is close to magic on some photos and hopeless on others. Here is what decides which one you get, and how to shoot so the tool has an easy job.
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Your iPhone saves photos in a format half the internet cannot read. Here is why Apple chose it, when to convert, and how to do it without losing the picture.
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