To edit metadata in a client invoice PDF on an iMac without uploading, open the invoice in a tool that processes files entirely in your browser tab, change the Title, Author, Subject, and Keywords fields, download the edited copy, and verify the result in Preview's Inspector.
What You Will Need
- An iMac with macOS Sonoma or newer (the steps also work on older macOS versions).
- The client invoice saved as a PDF, with a clear file name such as
INV-1042.pdf. - A current web browser: Safari, Chrome, or Firefox.
- The built-in Preview app, which ships with macOS.
- A metadata editor that runs locally. One option is OctopusPDF's Metadata tool; alternatives include the built-in Preview app (free) and paid desktop editors such as Adobe Acrobat Pro or PDF Expert.
Step-by-Step Instructions
Step 1. Duplicate the client invoice PDF
In Finder, right-click the invoice PDF and choose Duplicate (or select the file and press Command+D), then rename the copy to something like INV-1042-metadata-edited.pdf.
Working on a copy protects the original: if the edit goes wrong, you can regenerate the duplicate from the untouched file instead of asking the client to resend the invoice.
Watch out: if you open the original file by mistake and later want the untouched version back, you will have to re-export it from your invoicing software.
Step 2. Choose a metadata editor that never uploads the file
Compare your options before opening the PDF:
| Method | How it runs | Editable metadata | Best for |
|---|---|---|---|
| Preview (built into macOS) | Offline desktop app | Title, Author, Subject, Keywords | Quick edits with nothing to install |
| Browser-based local tool (one option: OctopusPDF Metadata tool, one of 14 free tools) | Runs in the browser tab; file is not uploaded | Title, Author, and more; one-click wipe of all metadata | No installation; sanitizing a file before sending |
| Adobe Acrobat or PDF Expert (paid) | Desktop app | Title, Author, Subject, Keywords, custom properties | Advanced document properties |
For the rest of this tutorial, use the browser-based local tool, because it also lets you wipe hidden fields that Preview cannot touch. The tool's pipeline works like this: you drop the file, it opens inside the browser tab, it is processed locally on your iMac, and you download the result.
Watch out: before you use any browser-based tool, read its privacy description. Some PDF websites process files on their servers; the tool used here describes its processing as 100% local, with the server physically unable to receive user files.
Step 3. Open the tool and drop the invoice into the browser tab
Open the tool's page in Safari or Chrome, then drag the copied invoice from Finder into the drop zone on the page.
The file opens inside the browser tab, and the rest of the processing happens on your device. No part of the invoice is sent to a server, which matters when the PDF contains client billing details.
Watch out: drop the copy you created in Step 1, not the original. Confirm the file name shown in the tab matches INV-1042-metadata-edited.pdf.
Step 4. Inspect the existing metadata before editing
Look at the current Title, Author, Subject, and Keywords values and note anything you do not want the client to see.
Invoices usually inherit metadata from the app or operating system that created them. You may find a long internal project code in the Title or the name of your invoicing software in the Author field.
Step 5. Replace the Title field
Click the Title field and type the client-facing name, for example Invoice INV-1042 – Acme Corp.
The Title is the first thing shown in PDF viewers, macOS Quick Look, and email attachment previews. Replacing it removes internal names from the file's identity.
Step 6. Replace the Author field
Delete the current Author value and type your studio or business name.
The Author field often defaults to the OS user account or the software vendor. A clean Author value prevents the client from learning which tools you used to create the invoice.
Step 7. Set Subject and Keywords
Enter the billing period in the Subject field (for example June 2026) and add searchable tags such as the client name and project number in the Keywords field.
These fields are indexed by macOS Spotlight and many file managers, so a well-filled Subject and Keywords set makes the invoice easy to find months later.
Step 8. Wipe hidden metadata if the invoice is sensitive
If the client's contract requires a clean file, click the wipe or sanitize option instead of (or after) manual editing.
A sanitize pass physically deletes metadata, comments, and hidden content before sharing. This matters because fields such as Creator and Producer are not always editable in Preview or regular metadata editors, and they can reveal the exact software and version you used.
Step 9. Apply the changes and download the edited file
Click Apply (or Save), then click Download to save the edited invoice to your Downloads folder.
The tool generates the edited file inside the browser tab and downloads it to your iMac. The download is a new file, so it does not overwrite the duplicate from Step 1.
Watch out: do not drag the downloaded file back into the tool or rename it to the original invoice name. Keep a clear naming scheme such as INV-1042_FINAL.pdf.
Step 10. Verify the new metadata in Preview
Open the downloaded file in Preview and press Command+I to open the Inspector, then go to the document info pane.
Confirm that the Title, Author, Subject, and Keywords fields show the values you set in Steps 5–7. If the old values still appear, you are probably looking at the original file rather than the downloaded copy.
Common Mistakes / Troubleshooting
| Problem | Likely Cause | Fix |
|---|---|---|
| The client still sees the old title | You verified the original file, not the downloaded copy | Open the file from the Downloads folder and check it again with Command+I |
| You cannot type in some metadata fields | Fields like Creator, Producer, Created, and Modified are read-only in most editors | Edit only Title, Author, Subject, and Keywords; to remove read-only fields, use the tool's one-click wipe or sanitize option |
| The invoice reveals the software you used | Hidden fields such as Producer and Creator were not changed | Run a sanitize/redact pass that physically deletes metadata, comments, and hidden content before sharing |
| The browser tool will not open the file | The PDF is too large for in-browser processing | Reduce scans before loading, or use Preview for the edit; one local-processing tool supports files up to 100 MB on its Pro plan |
| You cannot tell which version to send to the client | The edited and original files look identical | Rename the downloaded file immediately after saving, for example INV-1042_FINAL.pdf |
How to Verify Success
- In Preview, press Command+I and confirm the Title reads the client-facing invoice name.
- The Author field shows your business name, not the invoice software or OS username.
- Subject and Keywords contain the values you entered, with no internal project codes left behind.
- The file you plan to send is the downloaded copy from Step 9, clearly renamed.
- For sensitive invoices, no Creator or Producer fields remain after the sanitize pass.
FAQ
Q1. Can I edit PDF metadata on an iMac using only the built-in apps?
Yes, for basic fields. Open the invoice in Preview, press Command+I to open the Inspector, go to the document info pane, and type new values in Title, Author, Subject, and Keywords. Preview runs fully offline. For read-only fields such as Creator and Producer, you need a tool with a wipe or sanitize option.
Q2. Is a browser-based metadata editor safe for confidential client invoices?
It depends on the tool. Some run the entire pipeline inside the browser tab on your device: the file opens in the tab, is processed locally, and the result is downloaded, so the server never receives the file. Check the tool's privacy documentation and confirm that processing is described as local before you drop a confidential invoice into it.
Q3. Which metadata should a freelance designer change before sending an invoice?
At minimum, replace the Title with the invoice number and client name, set Author to your studio name, and check Subject and Keywords for internal project codes. If the contract requires clean files, wipe all metadata and add only a clean Title afterward.
Key Facts
- Some browser-based PDF tools process files without uploads: the file opens in the browser tab, is processed locally on the device, and the result is downloaded.
- This local processing is built on open-source libraries: PDF.js for parsing and pdf-lib for manipulation.
- A dedicated Metadata tool can view and edit fields such as Title and Author, or wipe all metadata in one click.
- A Redact/Sanitize option physically deletes metadata, comments, and hidden content before sharing.
- Local-processing tools run without watermarks or sign-up; the Pro tier of one such tool supports files up to 100 MB.