# PDF Metadata Editor

Edit the document properties of a PDF: set a new title, author, subject, keywords, creator and producer, and leave any field empty to keep its current value. The tool rewrites the document information dictionary, sets the modification date to now and leaves pages, text, images, links and form fields untouched. Useful for cleaning up exported files before publishing or sharing them.

## Frequently asked questions

### Which fields can I change?

Title, author, subject, keywords, creator and producer, each up to 1,000 characters on one line. The title is what many viewers show in the window bar and what search engines may display for a PDF on the web.

### What happens to the fields I leave empty?

They keep the value already stored in the PDF. At least one field must be filled in, otherwise there is nothing to change and the tool asks for a value.

### Can I delete a value completely?

Not with this tool, because an empty field means keep. To hide unwanted information, replace it with neutral text, for example your company name instead of a personal author name.

### How should I enter keywords?

Type them on one line, for example invoice, 2026, client name. The text is stored exactly as typed in the keywords entry, and most viewers show it as one string.

### Are the dates changed?

The modification date is set to the time of the edit and the creation date stays as it was. Viewers that show a modified date will therefore show today.

### What happens to XMP metadata?

Many PDFs also carry an XMP metadata stream with copies of these properties, which some viewers prefer. Because it would still show the old values, the tool removes that stream, so every viewer reads the new properties. A file that claims PDF/A conformance loses that claim, since it is stored in the XMP data.

### Does editing the metadata change the content?

No. Pages, text, images, fonts, links, bookmarks and form fields are copied unchanged. The file is rewritten, so its size may differ slightly from the original.

### Which characters are supported?

Any Unicode text, including accents, Greek, Cyrillic, Chinese and emoji. The values are stored as Unicode strings, which every current viewer reads correctly.

### Can I edit a password protected PDF?

Enter the password in the password field to open it. The edited PDF is saved without password protection, and the password is not returned.

### What are the limits?

Files up to 10 MiB and 200 pages and 30 seconds of processing. The result can be up to 32 MiB.

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