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PDFs don’t have to be boring—they can actually be pretty vibrant! We've teamed up with Flipsnack to help you create the perfect interactive PDF!

What’s the difference between PDF/A and PDF/X? Learn the strengths and limitations of these common PDF formats, along with PDF/E, PDF/VT & PDF/UA.

Do you know your PDF types? Here, we break them down—PDF, PDF/A, PDF/E, PDF/X, PDF/UA—and help you find the right PDF format for your needs.

Accessibility is a must. PDFs should be readable by all, including those using screen readers. Here’s all you need to know for accessible PDFs.

Save time and avoid email clutter by embedding PDFs directly into your emails for easy, instant access to important documents without downloading.

Transform your PDFs with OCR! Turn scanned images into searchable text and find what you need in seconds.

Creating a mobile-friendly PDF is simple. Follow these tips to make your PDF easy to read, fill out, and share on any phone screen.

Edit PDFs with Google Drive easily by teaming it up with Smallpdf’s powerful online tools. Here’s the simplest way to get it done, no fuss.

Easily underline text in a PDF document online with Smallpdf. Highlight key points, add emphasis, or mark notes—no downloads needed.

Strikethrough helps with editing, proofreading, marking revisions, redacting sensitive info, and more. Learn how to do it easily on any device.

Use our online PDF Annotator to highlight text in a PDF and add annotations for free. Access and use the tool online, anytime—no registration needed.

Align text in a PDF quickly with Smallpdf’s easy online tool. No downloads needed—just upload, edit, and download your perfectly aligned PDF.

You can! It’s easy and totally intuitive. Whether you need to highlight key points, leave reminders, or make remarks, all it takes is a few clicks.

Can you add comments to a PDF? Yes! Learn how to add notes, annotations, and comment boxes with online and native tools.

Want to create bookmarks and navigation in your PDF documents? We show you how to do it for free, plus a little bit more.

Adding notes to a PDF doesn’t have to be a chore. With Smallpdf’s easy-to-use annotator, you can mark up documents in no time and stay organized.

Add a table of contents to PDFs to make navigation a breeze, plus learn how to create a glossary, index, and sections for a polished document.

Want to add input fields to PDFs? It’s quick and easy with tools like Smallpdf or Preview on Mac—no fancy software needed! Here’s how to do it.

Looking to add drop-downs to a PDF but don’t want to spend a fortune on fancy software? We'll show you how to do it without spending a cent.

Easily add checkboxes to PDFs for forms, surveys, or quick checklists for free with Smallpdf—on any device—or with Preview on macOS.

PDFs can be tricky to edit; here's how to fix the most common issues in a few easy steps—no tech degree needed.

With Smallpdf compression, you can reduce PNG file size while preserving image quality. In this article, you’ll learn how to use this feature.

Need to hide sensitive info in a PDF? Here’s why you shouldn’t just black out the text, and what you should do instead. Plus, a free PDF redactor.

Learn how to watermark PDFs using two free methods: Smallpdf’s online tool and Mac’s Preview tool. Brand and protect your docs with this quick guide.