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AiMetaOff / GUIDES

Understand what PDF cleanup changes

Learn how to remove PDF metadata, check Author and XMP in the downloaded copy, and identify when a PDF needs redaction or sanitization.

A PDF can reveal your name, the application used to create it, and when it was created or modified. To remove PDF metadata before sharing, inspect the original, clear the supported document properties, and check the downloaded copy. If the same name also appears on the page or in a comment, it needs a separate review.

Where PDF metadata lives

  • Document Information dictionary (Info). Common fields include Author, Title, Subject, Keywords, Creator, Producer, CreationDate and ModDate. Creator usually describes the application that created the source document. Producer usually describes the software that generated the PDF.

  • Document-level XMP. The PDF catalog can point to an XML metadata stream. It may repeat an author, title or date from Info and store additional properties such as identifiers. Individual PDF objects can have their own metadata streams too.

Check both document-level stores. A single value can appear in each, and a date your operating system shows for the file is separate from a date stored inside the PDF.

Check whether the PDF is eligible

AiMetaOff can inspect and remove Info and catalog-level XMP in supported PDFs. Cleanup applies to whole categories, so clearing Info also clears any title or other Info property you wanted to keep. When a PDF has a filtered or compressed document XMP stream, the report can show it as present without displaying its values.

  • The input limit is 15 MB (15,000,000 bytes) and 200 pages per PDF. Complex or malformed files can also be rejected.

  • Encrypted PDFs are rejected during inspection. AiMetaOff provides no PDF password entry.

  • PDFs with detected digital signatures or signature fields can be inspected if they otherwise load. Cleanup is disabled. A rewrite changes the bytes a digital signature covers. Use an unsigned source copy if one is available.

  • PDFs with compressed object streams are unsupported. These streams package PDF objects and differ from ordinary compressed page-content streams, which the tool can preserve.

Remove supported PDF metadata

Inspect, remove and verify PDF metadata

If inspection or cleanup stops, check the file and format limits in Help.

  1. Inspect the original. Open Inspect File and use Choose files to select your PDF. Inspection starts automatically. Open View technical details on the file row. Check the Info entries and Document-level XMP finding. Expand Stored metadata to see any available XMP text, and note the values or categories you want to clear.

  2. Clear the document properties. Open the PDF tool in the same tab and make sure the inspected PDF is selected in the file list. Under Cleanup scope, keep Info and XMP checked to clear both stores. Click Clean selected. The site processes the PDF in your browser and writes a separate PDF copy. The original stays available for comparison.

  3. Download and inspect the saved copy. Use Download new copy when it appears. In Inspect File, choose that exact downloaded file. For a successful check of both categories, look for Not found in inspected structures for Info and XMP. If the tool reports No selected data to remove, there was no detected removal to confirm. If inspection fails, the result is unverified.

  4. Open both files in a trusted PDF viewer. Compare the page count, page dimensions, visible text and layout. Check any comments, attachments, form fields or bookmarks relevant to what you plan to share.

AiMetaOff reopens its output and checks the format, page count and selected metadata findings. On the supported path it keeps existing page-content streams and resources, so it does not turn pages into screenshots. Existing fixture checks compared page text and rendered pixels before and after cleanup. Compare your own download to catch differences that those checks cannot cover.

PDF metadata removal, redaction and sanitization

Clearing Info and catalog-level XMP removes document properties. Use redaction to remove sensitive text or graphics from page content. Use a PDF sanitization workflow when you also need to find and remove hidden or embedded information.

What can still be in the PDF?

  • Page text, images, visible signatures and watermarks, including names printed on the page.

  • Hidden or off-page content, layers and searchable OCR text behind a scanned page.

  • Comments, annotation authors, form values, bookmark titles and file attachments.

  • Embedded-image metadata, object-level XMP, identifiers in retained objects and active content such as actions.

What happens to earlier revisions?

Some PDF editors save changes incrementally by appending a revision. Earlier versions of objects can still be present in those files. When AiMetaOff successfully cleans an eligible PDF, it writes a new PDF from the retained object graph and drops objects that are no longer referenced. The rewrite also clears the PDF trailer's file ID entry. Existing tests confirmed removal of earlier metadata markers in a synthetic incremental PDF. Values can still survive in reachable content, and any other copies of the original retain their own data.

Verify independently with pdfinfo

With Poppler installed, run pdfinfo "cleaned.pdf" to check the common Info fields and whether a document metadata stream is present. Run pdfinfo -meta "cleaned.pdf" to display the catalog-level XMP when present. Substitute the actual filename and compare with the original. A successful command with no XMP output supports the document-level check. An error leaves the check unresolved. Page counts, file sizes and filesystem timestamps describe other aspects of the file. These commands cover selected properties and do not provide a full hidden-content audit.

FAQ

Can I remove the PDF author without clearing the title?

AiMetaOff clears Info as a category, so any Title in Info is removed with Author. Catalog-level XMP can contain another copy of either value. If you need to keep the title while clearing the author, use an editor that supports field-level changes in both stores and verify the saved file.

Why is the PDF author still visible after removal?

Check where the name appears. In document properties, look for a value in the other metadata store or check that you opened the downloaded copy. If it appears on the page, in a comment, in a form or in an attachment, it lives outside the properties AiMetaOff clears.

Can removed PDF metadata be recovered?

An editor that only appends changes can leave earlier values in the same file. AiMetaOff rewrites supported inputs, and the synthetic incremental fixture confirmed that the tested old markers were absent from the rewritten objects. Check retained content and other copies for the same values if they are sensitive.

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