Document format
PDF/A vs a standard PDF
When to use PDF/A for long-term archiving and when an ordinary PDF is the better choice. Compare compatibility, editing and file size.
Standard PDF
The everyday PDF format. It is easy to create, widely supported and fine for sharing, printing and most office work.
PDF/A
An ISO-standardized archival profile. It embeds fonts, restricts some features and aims to render the same way for decades.
| Factor | Standard PDF | PDF/A |
|---|---|---|
| Main purpose | General sharing, printing and day-to-day documents. | Long-term preservation and archiving. |
| Font handling | Fonts may or may not be embedded, depending on how the PDF was made. | Fonts must be embedded so the document does not depend on the viewer's system. |
| Editing | Form fields, annotations and links are common. | Some interactive features are restricted or need to be flattened. |
| File size | Often smaller, especially without embedded fonts. | Often larger because fonts and extra metadata are included. |
| Compatibility | Works in nearly every PDF reader and browser. | Also widely supported, but some editing tools handle it less flexibly. |
| Best for | Invoices, flyers, forms, contracts in active use and general sharing. | Records that must remain readable for many years, such as archives and legal deposits. |
Choose Standard PDF if…
- You are sharing or printing a document now.
- The file still needs to be edited, signed or have fields filled.
- You want the smallest practical file.
- The recipient did not ask for an archival format.
Choose PDF/A if…
- A records policy or official body requires PDF/A.
- The document must stay visually identical for decades.
- You are archiving and do not need interactive features.
- You can accept a larger file and a slower creation step.
The short version
For most everyday tasks, a standard PDF is the right choice. Use PDF/A only when preservation matters or when you are asked for it. Converting to PDF/A is not a substitute for checking the result in a reader.
PDF/A is a family of profiles (such as PDF/A-1, PDF/A-2 and PDF/A-3) with different rules. Check which profile the recipient requires.
Put it into practice
Use your own numbers instead of a generic example.
Terms used here
- PDF/AAn ISO standard for long-term archiving. A PDF/A file embeds fonts and avoids features that depend on external software, so it should look the same years from now. It is not the right format for everyday editing.
- FlatteningMerging interactive layers such as form fields, annotations and signatures into the page itself. A flattened PDF is harder to edit but displays more consistently across devices.
- OCROptical character recognition. It turns an image of text, such as a scan, into selectable text. OCR does not change how a page looks, but it makes searching and copying possible.