Quick answer
What is Overlay PDF used for?
Purpose
What does Overlay PDF do?
Expect a separate combined copy. Check that the letterhead has not obscured body text or footers.
Who normally uses it?
This guide is useful for people adding visible information, branding, numbering, print layouts, or reusable page content. The working tool is focused on one outcome: Lay one PDF over another — letterhead, a draft mark, a stamp.
Prepare
Before you start
- Plan the pages, position, text, color, and size before applying a repeated change.
- Keep important text inside a safe margin so printers and page crops do not hide it.
- Work on a copy when the output will make comments, fields, or additions permanent.
Worked example
Apply a one-page letterhead to a multi-page document.
This example describes a practice task, not a document you need to upload to us. Use your own authorised file and keep the original.
- 01
Prepare the example
Choose the base document first and the letterhead second, preferably with matching paper sizes.
- 02
Make the change
Choose Over or Under the document, then Actual size, Fit inside page, Cover page or Stretch to page. Create and inspect the result.
- 03
Check the result
Expect a separate combined copy. Check that the letterhead has not obscured body text or footers.
When the result is not right
Troubleshooting Overlay PDF
If alignment is wrong, check the two page sizes and Fit setting. There is no page matching selector in this view. Use a letterhead source with clear space for the base text.
Before you rely on the output
An opaque overlay background can hide the base page. Matching paper sizes does not guarantee matching margins.
Open the saved result as well as the preview. Keep the original until you have checked the pages and information that matter for your task.
Better results
Practical tips for Overlay PDF
Use the page preview at a larger zoom for precise placement.
Keep typography, spacing, color, and position consistent across repeated pages.
Open the exported PDF and inspect the first, middle, and last affected pages.
Honest expectations
Limitations and important checks
The result depends on the structure and quality of the source document, so visually inspect the exported file before relying on it.
Browser memory varies by device. Very large or unusually complex PDFs may work better when processed in smaller groups.
Questions and answers
Overlay PDF FAQ
Direct answers to the questions people commonly ask before using this tool.
What is Overlay PDF used for?
Overlay PDF is a browser-based Filozy tool built for this task: Lay one PDF over another — letterhead, a draft mark, a stamp. It runs on this device, creates a separate result, and does not require an account or document upload.
Can I use Overlay PDF on a phone or tablet?
Yes. Overlay PDF works in a current mobile browser. Complex PDFs can need more memory, so keep the tab open, avoid switching apps during processing, and inspect the result before closing the page.
Does Overlay PDF upload my file?
No. The selected file is opened and processed by code running in this browser tab. Document bytes and filenames are not sent to Filozy.
Will this change my original file?
No. Browsers cannot silently overwrite the file you selected. Filozy creates a separate result for you to save or pass to another local tool.
What should I check after using Overlay PDF?
Open the combined copy and inspect the first and last pages for alignment and unintended covering. Check pages of different sizes separately, and keep both originals.
Do I need an account or subscription?
No account is required for this browser-side tool. It runs on the device and does not use a document-upload allowance or daily server quota.
Privacy
Where does my document go?
For this tool, the document stays in the browser tab. Filozy can load same-origin support files such as its PDF engine, fonts, or OCR data, but the selected document bytes and filename are not sent with those requests.