Why Can't I Select Text in This PDF? It's Probably an Image
Ever open a PDF and find you can't highlight a single word? It's usually because you're looking at a picture, not text. Here's why that happens and how to fix it.
Working with PDFs raises the same questions over and over — why a file is huge, what a password really protects, why a scan has no selectable text. These guides answer them properly, in plain English, based on how PDF Tools actually works.
Ever open a PDF and find you can't highlight a single word? It's usually because you're looking at a picture, not text. Here's why that happens and how to fix it.
Using an online PDF tool feels convenient, but the moment you upload a document, you're trusting someone else with your data. So, what's really happening behind the scenes?
Ever wondered if you should use JPG or PNG when adding images to your PDFs? The choice isn't just about quality, it's about file size and how you plan to use the document.
2026-09-20
We’ve all been there: You have a document you want to edit, but don’t have a source file—you find yourself using a converter and getting a broken layout.
Want to keep your PDF safe? Or maybe you've got a protected file and want to remove the password? Here's how to protect and unlock PDFs quickly and securely.
Most online PDF tools send your document to a server to do work your own browser could do locally. Here is which operations truly need a server — and which never did.
Photographing paperwork is the modern scanner — but nobody wants to receive eleven photos. How to shoot documents well and turn them into a single, tidy PDF.
Converting PDF pages to images always asks the same question: JPG or PNG, and at what DPI? The right answer depends on what's on the page and where it's going.
Some PDFs let you select and search text; others behave like photographs. The difference is the text layer — and it decides what any PDF tool can do with your file.
A password-protected PDF is genuinely encrypted, not just hidden. But the protection has edges worth understanding before you trust it with anything sensitive.
Two ten-page PDFs can differ in size by a factor of a hundred. Here is what actually takes up space in a PDF, and what does and doesn't make one smaller.