Most people know that PDFs are good for sharing documents, but it is worth being specific about which types of files benefit most from being saved as PDF. The format is not always the right choice — but for these six categories, it almost always is.
1. Invoices and Receipts
Financial documents need to look exactly the same for the sender and the recipient. An invoice sent as a Word file can shift layout depending on the recipient's version of Word, their default fonts, or their printer settings. A PDF locks the layout in place — the numbers, totals, and formatting appear identically on every device. It also makes the document harder to accidentally edit, which matters for records that may be used for accounting or tax purposes.
2. Contracts and Legal Documents
Any document that someone is expected to sign or rely on legally should be a PDF. The format preserves the exact text and layout as intended, and it is widely accepted by courts, notaries, and government agencies. Sending a contract as a Word document invites accidental edits and creates version control problems. Once a contract is finalized, convert it to PDF and use a tool like add image to place a signature if needed.
3. CVs and Resumes
A resume sent as a Word file looks different on every computer. Custom fonts, spacing, and column layouts that look perfect on your machine can collapse entirely on someone else's. PDF preserves your formatting exactly. Recruiters and hiring managers also prefer PDFs because they open consistently in any viewer and are easier to print. Always export your resume as PDF before sending it.
4. Presentations Shared Outside Your Organization
PowerPoint and Keynote files are great for presenting, but they are not ideal for sharing. Fonts may not be installed on the recipient's machine, animations can cause display issues, and the file may be editable in ways you did not intend. Exporting to PDF gives you a clean, read-only version of each slide that looks the same everywhere. If the presentation is large, run it through the compressor before sending.
5. Forms That Need to Be Filled In
If you are distributing a form — an application, a survey, a registration sheet — PDF is the right format. It preserves the layout of fields and labels regardless of the device used to fill it in. Recipients can add text using a free tool like add text to PDF without needing any special software. The completed form looks the same when it comes back to you as it did when you sent it.
6. Anything You Are Archiving Long-Term
If you are storing a document for years — tax records, property documents, medical records — PDF is the most reliable format. Word processing formats change with software versions, and a .docx file from 2010 may not open correctly in 2035. PDF, particularly the PDF/A archival variant, is designed for long-term preservation. The format is an open standard and will remain readable regardless of which software exists in the future.
The common thread across all six categories is consistency and reliability. PDF removes the variables — fonts, software versions, screen sizes — and ensures the document looks and behaves the same for everyone who opens it.