PDF Tools·3 min read

PDF Metadata: What It Reveals and How to Edit It

You send a proposal to a new client, and their reader shows the title bar as Draft v7 - old client name. Nobody typed that on the pages. It came from the PDF's metadata, a small block of document information that travels with the file and quietly records who made it, with what, and when. The PDF Metadata Editor shows that information and lets you change or remove it in your browser. This guide explains what each field holds, where hidden copies live, and how to clean a file before it leaves your hands.

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What PDF metadata is

The label on the outside of the file.

Every PDF can carry a document information dictionary with a handful of standard fields: Title, Author, Subject, Keywords, Creator, Producer, and the creation and modification dates. Readers show them under Document Properties, and some show the title in the tab or window bar instead of the file name.

Most people never fill these fields in, so the software does it for them. Word copies the document title and your account name, a scanner app writes its own name, and a PDF library stamps itself as the producer. The result is a record you did not write but still send to everyone who gets the file. Lawyers, journalists and recruiters have all been caught out by it: an author field naming a rival firm, a creation date that contradicts a story, or a template title from a previous employer.

The hidden second copy: XMP

Why an old title keeps coming back.

Many PDFs also contain an XMP packet, a block of XML that repeats the same information and sometimes adds more, such as editing history or the original file path. Some readers prefer the XMP copy, so changing only the Title field can leave the old title showing.

The editor shows whether an XMP packet exists and lets you read it in full. When you save, the Remove the XMP metadata packet option, ticked by default, deletes that copy so only your new values remain.

Editing the fields

Change, clear or add.

Open the PDF and every field fills in with its current value. Type a new title, fix the author, add keywords separated by commas, or set the creation and modification dates with the date pickers. Emptying a field removes it from the file rather than leaving a blank value.

Two extras are worth knowing. The Language field sets the document's main language, such as en-GB, which screen readers use and accessibility checkers look for. And the Show the title option tells readers to display your title instead of the file name. Custom fields added by other apps, such as Company or SourceModified, appear in their own list where you can edit or delete them.

A worked example: cleaning a proposal before it goes out

Two minutes that save an awkward call.

Input: proposal.pdf, exported from a template last used for another client. Open it in the editor. Title reads Draft v7 - Northwind, Author shows a colleague who left last year, and a custom Company field names the old client. The XMP packet repeats all three.

Set Title to Website Redesign Proposal, Author to your company name, clear Subject, and delete the Company custom field. Keep Remove the XMP metadata packet ticked and tick Show the title. Press Save & download. Output: proposal-metadata.pdf, which opens with the new title in the reader's bar and nothing left of the old client.

Removing everything before you share

One button for the cautious.

When a file should carry no document information at all, press Remove all metadata. The information dictionary, the XMP packet and the language tag are deleted, and the file downloads with a -clean suffix. The pages look exactly as before.

Check custom fields first. They often hold company names or file paths.
Remember that metadata is not the page content. Names in headers, footers and signatures stay until you edit the pages.
Clean the final version. Editing the file afterwards in another app may add new metadata.
Unlock password-protected files first with Unlock PDF, then protect them again after cleaning.

Metadata and search engines

A small fix for published PDFs.

Search engines index PDFs and can use the document title when they list one. A PDF titled Microsoft Word - Document1 looks careless in results and gives searchers nothing to go on. Setting a clear title and subject before you upload a brochure, price list or white paper costs a minute.

Keywords matter far less than they once did, so do not stuff them. A clear title, an accurate subject line and a language tag do more for readers and search engines alike. Everything here runs in your browser with pdf-lib, so even unpublished documents stay on your device. If you publish many PDFs, make a habit of opening each final file here before upload; it takes less time than renaming the file and fixes the name readers actually see.