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Renaming scanned PDFs from their own properties

A folder of scans called Scan_0001.pdf to Scan_0412.pdf is unsearchable. Some PDFs carry a title, author and date inside them that could name the file for you; many scanned ones do not. Here is how to check, and what to do in each case.

Scanners and scanning apps name files the way it is easiest for them: Scan_0001.pdf, Document 14.pdf, IMG_20261006_0912.pdf. After a year, you have hundreds, and finding the insurance letter means opening them one by one.

Every PDF can carry properties inside it — a title, an author, a subject, keywords, creation and modification dates. When those are filled in, they can name the file for you. When they are not, there are other routes.

What is inside a PDF

The PDF format has a set of document properties, sometimes called metadata:

  • Title
  • Author
  • Subject
  • Keywords
  • Creator — the app that made the original document
  • Producer — the software that produced the PDF
  • Creation date and modification date

These are separate from the filename. A file called Scan_0042.pdf can have the title "Home insurance renewal 2026" inside it — or no title at all.

Checking what a PDF contains

In Preview: open the PDF, choose Tools → Show Inspector (Command-I), and look at the first tab. It lists title, author, subject, keywords, creator, producer and dates, where present.

In Finder: File → Get Info shows some of this under More Info, depending on what Spotlight has indexed.

In Terminal: mdls lists everything Spotlight knows about a file:

mdls Scan_0042.pdf

Look for kMDItemTitle, kMDItemAuthors and kMDItemContentCreationDate.

The honest part: scans often have little

PDFs exported from a word processor or received from a company usually have meaningful titles and authors. Scanned PDFs often do not:

  • The title is empty, or the same as the filename, or just "Scan".
  • The author is the scanner's user name or empty.
  • The creation date is the date of scanning — which is at least real and useful.
  • Creator and Producer name the scanning app.

So before planning a rename around properties, check a sample of ten files. If the titles are empty, a property-based rename will produce names like Untitled_001 — accurate, but not useful.

Three strategies, depending on what you find

1. Properties are good. Downloaded statements, exported reports, e-books and papers often have real titles and authors. A rename like Author – Title.pdf or YYYY-MM-DD Title.pdf works directly.

2. Only the date is useful. Rename by creation date, in YYYY-MM-DD form, plus a counter:

2026-10-06_scan_001.pdf

That alone makes the folder sort in time order, which is usually how people remember paper documents — "the letter from spring".

3. Nothing inside is useful. Then the information has to come from you. Two efficient ways:

  • Fix it at the scanner. Many scanning apps let you name the document or set its title when saving. A few seconds per scan saves minutes later.
  • Rename from a list. Open the files in order, type a short description for each into a spreadsheet — one row per file — and apply the list as new names in one go.

Making scans searchable

Names help you browse; text helps you search. A scanned page is an image unless text recognition has been applied.

  • macOS Live Text lets you select and copy text from images in Preview and Quick Look, but that does not make the PDF itself searchable in Spotlight.
  • Many scanning apps can add a text layer (OCR) when saving, so Spotlight can find words inside the document.

Where your scanner app offers it, turn it on. Combined with dated filenames, it makes a scan archive usable.

A naming pattern for paper

A pattern that holds up:

YYYY-MM-DD_sender_subject.pdf

2026-03-14_insurer_home-renewal.pdf 2026-05-02_tax-office_assessment.pdf

Date first for sorting, the sender for scanning by eye, a short subject for searching.

Where RenameDeck fits

RenameDeck is a batch renamer for Mac, and it can build names from PDF properties as well as file-system dates, counters and parent folders. For the first strategy, a template built from the title property — alone, or after the date — names a folder of well-described PDFs in one pass. For the second, a date rule formatted as YYYY-MM-DD plus a zero-padded counter does the job. For the third, RenameDeck can import names from a CSV or a pasted list and apply them in order.

In every case, the full list of proposed names appears before anything changes, so you see immediately whether the titles are useful or empty. Invalid names and collisions are flagged, and RenameDeck never overwrites an existing file. A saved recipe can be assigned to the folder your scanner saves into, and history supports undo.

It is sandboxed with no network entitlement — your documents' properties never leave your Mac — and requires macOS 14 or later.

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