PDF metadata is the structured information block embedded inside every PDF file that records the document's title, author, subject, keywords, creator application, producer, and creation or modification dates, and editing it means rewriting those fields while leaving the visible page content untouched. Most PDFs carry a default information dictionary generated by the software that exported them, which is why nearly every file you receive is labeled with the name of a printer driver or a generic title like "Microsoft Word Document." Updating this hidden information is a common need for professionals who publish reports, share research, archive client deliverables, or simply want their files to be searchable and properly attributed.
The PDF Metadata Editor lets you open a file from your device, review every detected field, change the values you care about, and download a new copy with the updated information dictionary. Because the entire process happens locally in your browser, your document never leaves your computer, which matters when the file contains drafts, financials, or unreleased material. The tool reads the standard XMP and Document Information Dictionary entries that PDF readers like Adobe Acrobat, Preview, and Foxit expose under "Document Properties," so any field you change will be visible the same way in those applications.
What Lives Inside PDF Metadata
The PDF specification, maintained by the International Organization for Standardization under ISO 32000, defines a document information dictionary plus an XMP (Extensible Metadata Platform) stream that hold descriptive fields about a file. The dictionary fields are the ones most viewers expose directly. They are:
| Field | Purpose |
|---|---|
| Title | The document's name, often shown in browser tabs, search results, and library catalogs. |
| Author | The person or organization responsible for the content. |
| Subject | A short description of the topic, used by some viewers and search indexers. |
| Keywords | Comma-separated terms that help with retrieval and SEO for indexed documents. |
| Creator | The application that produced the original content, such as Microsoft Word or LaTeX. |
| Producer | The software that generated the PDF, such as a print driver or a converter. |
| CreationDate / ModDate | Valid timestamps recorded when the file was first made and last modified. |
Beyond these core entries, XMP can carry custom namespaces for things like project codes, copyright notices, and accessibility flags. The PDF Metadata Editor surfaces the core dictionary fields that almost every reader actually displays, which keeps the interface simple while still covering the values people typically need to fix.
Why Metadata Matters for Search and Accessibility
Metadata is the primary way a computer makes sense of a PDF without reading the pages. When you index a folder of contracts, share a report on a shared drive, or submit a paper to a repository, the title, author, and keywords are what surface in search results before any text is scanned. Accessibility tools rely on the same fields: screen readers announce the document title and author when a PDF is opened, which is critical for users who cannot see the cover page. Inaccessible metadata is one of the most common reasons PDFs fail accessibility audits, and the fix is often as simple as setting a proper title and author.
Privacy is the other side of the same coin. A file exported from your office may have a creator field that names your employer, a producer field that names your local printer driver, and a custom XMP block that includes your Windows username. Stripping or rewriting those fields before sharing is a small but meaningful step in redacting the document's history. The metadata editor workflow described below gives you a way to do that without ever uploading the file to a remote server.
Edit PDF Metadata in Your Browser
Follow these steps to read and update the information dictionary of any PDF using the PDF Metadata Editor. The tool runs entirely in your browser, so no account, installation, or upload is required.
- Open the PDF Metadata Editor and click the file picker to choose a PDF from your computer.
- Wait for the tool to parse the document; the detected title, author, subject, keywords, creator, producer, and dates will appear in editable fields.
- Replace any value you want to change, such as setting a real title, adding a comma-separated list of keywords, or correcting the author name.
- Leave the fields you do not need to change untouched, or clear them entirely if you want to strip identifying information.
- Click the save button to write a new PDF copy with the updated information dictionary embedded.
- Download the resulting file and open it in your preferred viewer, then choose File > Properties (or the equivalent menu) to verify every field shows the new value.
Because the original file is not modified in place, you can always re-export from the source if you need to start over. The new file is a separate copy, so the original metadata remains intact on the source.
Choosing the Right Field to Change
Different fields have different downstream effects, so it helps to decide what you actually want to accomplish before editing. If you are publishing a report, prioritize the title, author, subject, and keywords because those are the fields that show up in search indexes and document management systems. If you are sharing a draft and want to anonymize its origin, clearing the creator and producer fields removes the trail of the software that generated the file. If you are preparing a file for accessibility review, focus on the title and author because screen readers announce those first when the document is opened.
Dates are often the most sensitive. A creation date that predates your project timeline, or a modification date that exposes when a draft was last touched, can leak information about internal workflows. The PDF Metadata Editor lets you set valid timestamps for both the creation and modification entries, which lets you keep the file history consistent with how it will actually be used.
After You Save: Verifying and Distributing the New File
Once you download the updated PDF, the first check is to open it locally and confirm the changes stuck. In Adobe Acrobat, the path is File > Properties > Description. In macOS Preview, it is File > Show Inspector > the metadata tab. In most browser-based viewers, the metadata is exposed when you download or print the file. If any field still shows the old value, return to the editor, reload the original file, and re-save; the issue is almost always that the new file was not the one you reopened.
For distribution, keep the original file in a private location and share only the metadata-cleaned copy. If you regularly produce PDFs that need the same descriptive information, consider standardizing on a template: a single set of title, author, subject, and keyword values applied to every file makes a folder of reports far easier to search later. The same pattern is useful when you maintain a document library for a team, because consistent metadata is what makes bulk search and filtering work.
Related Workflows for Working with PDFs
Editing metadata is often one step in a longer document preparation flow. If you are preparing a file for distribution, you may also need to rotate pages and save the new orientation, permanently crop margins, or remove unwanted pages before the document is ready to share. Each of these tools runs locally, which means you can chain them together without ever uploading the file to a remote service. The PDF Metadata Editor is the right place to start because the other steps assume you already know what the file is and who wrote it.
For background on how the PDF format encodes this information, the ISO 32000 series defines the document information dictionary and XMP packet structure, and most of the fields the editor exposes map directly to entries described there.