QBMFX Add PDF watermark guide
Mark a PDF copy with text such as DRAFT, SAMPLE or a shop-specific note before sharing it. Choose an appropriate font size and opacity, then inspect pages containing photographs, signatures and dense tables. A watermark can communicate document status, but the visible label should never be treated as encryption, access control or a guarantee against copying.
Before you start
Keep an unchanged copy of the original PDF. Use a clear file name and check that the selected files belong to this job. Use an unencrypted PDF and open it before processing to confirm that the pages display correctly.
Work on a device with enough free memory for the job. A small sample is a useful first check, especially on a phone or when the source contains many pages or high-resolution photographs. Keep other large processing tabs closed while generating the result.
Steps and settings
- Choose a PDF and enter the watermark text.
- Set text size, position and opacity.
- Generate the marked copy and check its readability.
Use the settings shown in the workspace for this task. Recheck the file order and measurements before starting. If you change an input or setting after a result is generated, create a fresh output so the downloaded file matches the choices currently displayed.
Processing details
The tool draws additional visible text on each page. Opacity controls the strength of that added text relative to the content already on the page.
Processing stays on your device, without an account, API subscription or document upload. Book centers, freelancers and developers can use the website free of charge; prepare its resources while online before working offline. The current installed app and extension have a separate release schedule.
Result checks
- Open the actual downloaded result and compare it with the source or entered details.
- Check the first and final pages, ordering, borders and any fine text, numbers or stamps.
- Print a single test sheet before a large job. Choose actual size or 100% when physical measurements matter.
- Keep the original input until the customer or intended reader has accepted the result.
Practical limits
Watermarks do not prevent copying or editing. They can obscure content and can invalidate existing digital signatures when the file is changed.
A PDF edit can invalidate an existing digital signature. Image-based PDF output can remove selectable text, interactive fields and links. Use the original when its editable or interactive features must be preserved.
Offline preparation and app availability
Prepare the website resources from Help while the connection is available and wait for the ready status. Tools that use OCR or a Nastaliq font require an additional optional resource download. HEIC decoding is included in the main website resource pack. Test the required workflow after disabling the connection; browser storage can be cleared or evicted later.
Adding the site to a phone’s Home Screen creates convenient access and does not itself prepare every resource. The existing Microsoft Store app and Edge extension contain the original four PDF tools. This Book Center website tool needs a separate installed-package release before it appears in those apps.
Add PDF watermark answers
Document protection
A visible watermark describes a copy’s status. It does not authenticate the document or stop another program from extracting or changing its contents.
Price and account requirements
This website tool is 100% free. No login, subscription or paid conversion tier is required. Your device supplies the processing memory.
Files and privacy
Input documents and generated results are handled locally. They are not sent to a QBMFX conversion API or stored in a customer database. Website hosting and advertising can still make separate network requests.
Offline preparation
Prepare the website resources from Help while connected, then test the required tool offline. OCR and Urdu text tools also need their optional language or font resources prepared first. Browser storage can be removed by the browser or by you.
Windows app and Edge extension
The existing installed app and extension contain the original four PDF tools. These new Book Center tools belong to the website release; they will need a separate installed-package update.
Related workflows
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