Is It Safe to Upload My Scanned Document to Dotspotter?

Updated

Dotspotter (forensicdots.de) is a web-based tool that analyzes a scanned printout to detect the yellow tracking dot code (MIC) left by color laser printers. Whether it is "safe" to upload your scan depends on what is on the page and how you handle the file — the site itself points you to its Terms and Conditions and Privacy Policy pages, and that is where you should look before sending anything sensitive. The tool is built around a specific, narrow input: a 600 dpi color scan of a mostly white printed page, not an arbitrary document.

What Dotspotter actually does with your upload

The workflow is designed around one task: finding the yellow dot pattern on a printed sheet.

  • You print a page (the site suggests a mostly white page and offers a template, dotspotter-test-sheet.png).
  • You scan it at 600 dpi, color, 24-bit, photo quality.
  • You save it as JPG and upload it.
  • Dotspotter processes the image and, if successful, shows a second image on the right side with the detected dots.

Because the intended input is a near-blank test sheet, the privacy question is mostly about what you choose to scan, not about what the tool requires. If you scan a blank or template page, there is little personal content to expose. If you scan a real document — a contract, an invoice, an ID — you are uploading that content.

The practical risk factors

Factor Why it matters
Page content A blank test sheet carries no personal data; a real document does.
File handling The site provides Terms and Conditions and a Privacy Policy — read them to see how uploads are stored or retained.
Upload size limit Files must be under 10 MB. The site advises cutting the image rather than lowering quality or resizing.
Processing time Depending on image size, Dotspotter can take several minutes, which implies server-side processing of your file.
Payment PayPal is listed as a payment platform, but the detection tool is described as an upload-based service.

How to reduce what you expose

If your goal is only to check whether your printer embeds tracking dots, you do not need to upload a sensitive document at all.

  1. Print the provided template (dotspotter-test-sheet.png) or any mostly white page.
  2. Scan that sheet at 600 dpi, color, 24-bit.
  3. Save as high-quality JPG under 10 MB — cut the image if it is too large rather than compressing it.
  4. Upload and run Dotspotter.

This gives you the same diagnostic result — whether your printer produces detectable yellow dots — without sending real content.

Before you upload anything sensitive

  • Open the site's Privacy Policy and Terms and Conditions pages and check how uploaded images are handled.
  • If those pages do not clearly state retention or deletion, treat the upload as you would any third-party file transfer.
  • Prefer the blank-sheet method when you only need to test the printer.
  • If you must scan a real document, consider whether the tracking-dot question can be answered from a cropped, non-sensitive region instead.

Bottom line

Dotspotter is a focused detection tool, not a document storage service, and its own instructions steer you toward a blank test sheet. The safest use is to upload only a blank or template scan. For anything containing personal or confidential information, review the Privacy Policy and Terms first, and decide based on what it says about how your image is processed and kept.