TIFF vs PDF/A: which format should I use for digitized records and how do they differ?

Both TIFF and PDF/A are widely accepted for digitized records, but they serve different roles. The right choice depends on what you are capturing, how it will be used, and how long it must be retained.

What each format is

TIFF (Tagged Image File Format) is a raster image format. Each page is stored as a grid of pixels, much like a digital photograph of a document. TIFF can hold uncompressed or losslessly compressed images at high resolution and bit depth, which makes it a long-standing choice for faithful, pixel-accurate reproductions of originals.

PDF/A is an archival profile of PDF, standardized through ISO specifically for long-term preservation. Unlike a general PDF, PDF/A restricts features that hinder future access (it embeds all fonts, forbids external dependencies, and disallows encryption). It can contain page images, true text, or both layered together.

How they differ in practice

• Self-containment: PDF/A is designed to be self-describing and reliably renderable far into the future. TIFF is stable and well-documented but is purely an image wrapper.
• Text and search: PDF/A can carry a searchable text layer (often from OCR) alongside the page image. TIFF holds only the image, so searchability requires a separate index or sidecar file.
• Multi-page handling: PDF/A naturally bundles many pages and metadata into one document. TIFF can be multi-page, but workflows often produce one file per page.
• Fidelity: For capturing the exact appearance of an original at archival quality, uncompressed TIFF is a common master format.

Which should you use

A frequent best practice is to use both. Many programs create a high-resolution TIFF (or other lossless image) as the preservation master, then derive a PDF/A access copy that adds a searchable text layer for everyday use and discovery. This separates long-term safekeeping from convenient retrieval.

If you must pick one, let the use case decide: choose archival-quality TIFF when faithful image preservation is paramount, and choose PDF/A when documents must be searchable, shareable, and self-contained over time. Whatever you select, follow recognized imaging guidelines for resolution, color, and metadata, and confirm the format satisfies any retention obligations for the records involved.

Learn more on the digitization and imaging topic hub.