How do I capture index metadata during a scanning project so the images are actually findable later?

A scanned image is only as findable as the metadata attached to it. Capturing good index metadata during the project — not as an afterthought — is what turns a pile of TIFFs or PDFs into a retrievable collection. The work happens in three stages: planning, capture, and quality control.

Plan the index before you scan

Decide how people will search for these records, then design fields to match. Typical index fields include a unique identifier, document or record type, date, originating office or person, a title or subject, and any case, matter, or account number that links related items.

Keep the set lean and purposeful. A few well-defined, consistently populated fields beat dozens of fields that staff fill in inconsistently. Document each field’s meaning, format, and whether it is required so every operator indexes the same way.

Capture metadata as part of the workflow

Build indexing into the scanning process rather than bolting it on later:

• Standardize formats. Use a fixed date format and controlled values (pick-lists) for categories so entries are uniform and machine-sortable.
• Use OCR for full-text search. Optical character recognition makes the body text searchable, but it complements structured index fields — it does not replace them.
• Capture technical/preservation metadata too. Resolution, file format, capture date, and a checksum support authenticity and long-term access.
• Separate description from identification. A unique ID lets you re-link an image to its index record even if files are moved or renamed.

Verify before you declare it done

Index errors are easy to make and hard to find later. Sample a meaningful portion of each batch, confirm that key fields are present, legible, and correctly keyed, and check that images open and match their records. Reconcile counts so nothing is lost or duplicated.

Tie everything back to your retention schedule: index fields should let you identify a record’s type and trigger date so it can be retained or disposed of properly.

For broader context on capture standards and managing records in digital environments, see FADGI’s digitization guidelines and ISO 16175, and explore the digitization and imaging topic hub for related guidance.