The basic flow is intended to be free. Ads can be used to keep the service available.
Watermark PDF
Add centered or diagonal text watermark to protect your documents.
How it works
Watermark PDF in ConvertiHub is built to solve everyday office tasks quickly without technical steps. Upload your files, apply the action you need, and download the result in seconds from desktop or mobile. To keep processing safe, the platform validates real file type, enforces upload limits, and uses temporary storage outside the public folder. If your document has unusual internal structure or comes from an old scanner, processing may fail; if that happens, retry with a different file or re-export it from the original software. The tool is optimized for speed, clarity, and practical compatibility in routine work, study, and document administration.
FAQ
It accepts files compatible with the tool and validates real MIME type for safer handling.
If a PDF or image is damaged or structurally incompatible, you will get a friendly error and can retry.
Files are kept temporarily and removed automatically by a scheduled cleanup task.
This tool runs locally on the server using standard PHP libraries.