Rename scanner files meaningfully

You scan a pile of post, and the target folder then holds SCAN0001.pdf through SCAN0023.pdf. A week later nobody knows which one is the annual utility statement. Worse: after a device restart the counter begins at one again, and copying into the filing folder produces name collisions. This is not an operating error but a property of the devices.

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Before & After

SCAN0001.pdf 2024-03-15_Stadtwerke_Jahresabrechnung_Strom.pdf

Why SCAN0001 happens

A scanner knows nothing about content. It produces an image file and needs a unique name for it, so it takes a prefix and a counter. Some devices use a timestamp instead, which looks better and helps little: img_20240315 tells you when you scanned, not when the document is from. Counters also have the unpleasant habit of restarting at zero after the device settings are reset — which is where the name collisions during filing come from.

What you can set on the device itself

Before thinking about software, get what you can out of the hardware. Most multifunction printers and document scanners allow several scan profiles, each with its own target folder and file prefix: one profile for incoming invoices, one for contracts, one for private post. That settles the rough classification before a file even exists. Also set the output to searchable PDF if the device offers it, and scan at 300 dpi in greyscale — the best compromise between legibility and file size.

Preparing the pile properly

A large share of later recognition problems arises before the scan. Staples and binding strips have to come out, otherwise the feeder pulls pages in crooked and the lines sit tilted in the image. Do not feed a multi-page document together with the next one — that produces a file containing two senders which cannot be assigned cleanly. Scan double-sided post in duplex mode and enable blank page removal if the device offers it. Ten minutes of preparing the pile saves more rework later than any setting in the software.

Scan date is not document date

This point is underrated. If you scan three weeks of accumulated post on a Saturday, every file carries the same date — your Saturday. Sort the folder chronologically later and invoices from three different weeks sit side by side in arbitrary order, and for bookkeeping the ordering is worthless. It only becomes useful when the date comes from the document itself. That is precisely what a device cannot deliver, because it does not read the content.

When there is no text layer

Many devices produce a pure image PDF. To the operating system it contains no text, so full-text search finds nothing, and a content-based tool cannot evaluate anything either at first. Filery Rename has an optional OCR step for this: if the text layer is missing, the page is processed as an image and character recognition runs first. That costs time per file and depends noticeably on scan quality — skewed originals, carbon copies and very faint printouts stay difficult.

How Filery works through the scan folder

You set up a scan folder and run Filery over it on a fixed rhythm. The app reads each PDF, recognises sender, document date, document type and subject, and proposes a name according to your pattern, for example Date_Sender_Type. SCAN0001.pdf becomes 2024-03-15_Stadtwerke_AnnualStatement_Electricity.pdf. Every suggestion appears next to the old name before renaming, per file or for the whole folder. There is no automatic folder watching — you start the run yourself.

FAQ

Filery works with the PDF files produced, regardless of manufacturer. What matters is not the brand but whether the text is readable — either as an embedded text layer or through the optional OCR.

With faint printouts, badly skewed originals or thermal paper, character recognition reaches its limits. Those files get no dependable suggestion. Usually it pays more to rescan them than to guess at the name.

A multi-page PDF is treated as one document. If several separate receipts were merged into one file during a single pass, however, no clean assignment is possible — better to separate such piles while scanning.

No, you start the run yourself by selecting the folder. In practice a fixed slot, once a week for instance, is enough to stop a backlog forming and to keep the review stretch short.

Filery reads the PDF on your machine and sends the extracted content encrypted for AI analysis. The recognised metadata comes back, and the renaming runs again on your own device. The files themselves are not stored permanently.

Related topics

Fix messy PDF folder chaos
Rename thousands of PDFs retroactively
Enforce file naming conventions automatically

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