Edit PDF Metadata
Change title, author, creator, producer, dates and custom PDF properties locally in your browser.
How to change PDF properties
1. Select PDF
Drag and drop or choose your file. The editor reads the current properties locally in your browser.
2. Edit fields
Change standard properties, timestamps, or custom Info fields. Structural properties such as page count require changing the document itself.
3. Save PDF
Download the rewritten PDF with your updated document properties.
What can I edit?
- Descriptive fields: Title, Author, Subject, and Keywords.
- Software fields: Creator and Producer.
- Dates: Creation Date and Modification Date.
- Custom Info fields: add or change supported string properties in the Document Information dictionary.
What does saving change?
Lyonite rewrites the PDF and writes the edited properties to the Document Information dictionary. If an active document-level XMP metadata stream is present, the current editor removes it so stale XMP values do not contradict the edited fields.
Rewriting the file also invalidates existing digital signatures over the original bytes. Use an unsigned copy when you need to preserve a valid signed original.
Frequently Asked Questions
Can I change the "Title" that appears when I open a PDF?
Yes. Some viewers display the PDF's internal Title metadata instead of, or alongside, the filename. Changing the Title field can change that displayed label, although the exact behavior depends on the PDF viewer.
How do I change the Author of a PDF?
Load the PDF, change the Author field, and save the updated copy. Do not confuse Author with Creator: Author is usually a person or organization, while Creator usually identifies the authoring application.
What happens to XMP metadata when I save edits?
Lyonite currently edits the Document Information dictionary rather than rebuilding an XMP packet. When the file is saved, the active document-level XMP stream is removed so old XMP values do not conflict with your new Info fields.
Can I edit a digitally signed PDF?
You can create an edited copy, but the existing signature will no longer validate against the rewritten bytes.
A signature field may still remain in the edited copy. Lyonite detects signature structures but does not validate certificate trust or cryptographic validity.
Are files uploaded to your server?
No. This metadata editing operation runs locally in your browser. Lyonite does not upload the PDF to its server for metadata processing.