What Is A PDF?

What Is a PDF?

PDF stands for “Portable Document Format.” It’s a widely-used file type designed to display documents consistently across different devices. If you have ever downloaded a printable form, manual, or e-book, you have likely encountered a PDF.

Who invented PDF?

First introduced by Adobe in 1993 (based on PostScript), PDF became an open ISO standard in 2008, which is why every PDF reader, not just Adobe’s, can open one. The format has evolved since, and we are currently using version 2.0. These days, it’s maintained by the PDF Association, of which we are proud members!

Why are PDF Documents so popular?

PDF documents are really popular because:-

• They work on all devices with no need for additional software
• They are very well supported by Software and hardware vendors
• Documents always look the same – no odd formatting issues on your phone
• It’s a simple single file format with no extra attachments

How Is a PDF Different From Word, JPG, or HTML?

Each of those formats is built for a different job. Word is easy to edit but isn’t guaranteed to look the same on a machine with different fonts installed. A JPG can show a document as a picture but has no real text underneath it. HTML is responsive and web-friendly, but it reflows by design, so the layout isn’t fixed. PDF is the one built for “this must look exactly the same on your screen as it does on mine” – which is why converting a Word doc to PDF before sharing it is standard practice: no weird overlaps, no substituted fonts, no formatting issues. What you see is what everyone else sees.

Creating a PDF

The easiest way to turn a Word doc into a PDF is by simply saving it as one. In most software, it’s as easy as going to “File” > “Save As” and selecting PDF as the file format. Voila! Your document is now a PDF.

Can You Edit a PDF?

After discovering the magic of PDFs, you might think, “Great, I’ll just edit everything in this format from now on!” But then you open such a file in a text editor and… BOOM! A bunch of gibberish shown below:

That’s because this format isn’t designed to be edited in the traditional sense. You can’t just open and edit a PDF file. That’s why when you open one in a text editor, it looks like a jumbled mess of symbols and characters.

To view them, most operating systems (Windows, macOS, Linux) support free readers like Adobe Acrobat, Preview, Nitro, and Foxit.

Even web browsers like Chrome, Safari, and Firefox have built-in viewers, so you can open them without any extra software. But if you want to edit this format, you’ll need specialized (and often paid) tools.

For the Curious Techies

For those of you who want to understand the PDF file format, perhaps you’re a developer or just super curious, you can dig into its structure by viewing the PDF objects (the building blocks of the file).

PDF dictionary is one of the key parts of the object. Finding out the PDF version is also useful for development, as it helps you understand the specific features available in that file. We also have an article for you around FAQs about the file format.

Is Every PDF the Same?

Not quite. Ordinary PDF is deliberately loose about what a file is allowed to contain, it can reference external fonts, carry JavaScript, embed video. There’s a stricter subset called PDF/A, built specifically for long-term archiving, which locks all of that down so a file stays readable decades later.

Are PDFs the best for Documents Displaying?

Although a viable option for displaying documents, developers need granular control over what they’re displaying. The PDF format can be quite restrictive in this aspect.

One of the better alternatives would be to use HTML to display your documents. Certainly in terms of being web-friendly and accessible HTML is the better choice, as well as for more recent use cases including for example HTML being more accessible to LLMs for AI processing.

Our tool BuildVu helps you achieve exactly that, converting your PDF into clean and granular HTML, bringing control back into the hands of developers.

Conclusion

So, in a nutshell: PDFs are your best friend when you want to share documents without worrying about messy formatting. Just don’t try editing them with a regular text editor, you’ll only end up staring at a sea of random characters.

Our software libraries allow you to