移除浮水印
偵測並移除 PDF 文件中的浮水印。
About Remove Watermark
How Watermark Removal Works
OxygenPDF scans your PDF for watermark-like elements: annotations marked as watermarks, Optional Content Group (OCG) layers used for overlays, and transparency-based XObject watermarks. The tool classifies each detection by type and confidence level, then removes the ones it can.
For annotation-based watermarks, removal is lossless — the tool strips the annotation objects from the PDF structure without touching the page content. For OCG layer watermarks, the tool rasterizes pages with the watermark layer hidden, producing a clean output.
When You Need to Remove a Watermark
Watermarks serve a purpose during review. Once a document is final, they get in the way.
Finalized Documents
A draft watermark on an approved contract looks unprofessional. Remove it before sending the final version to clients or stakeholders.
Print-Ready Output
Watermarks that look fine on screen can be distracting in print. Strip them for clean hardcopies.
Presentation Materials
Slides and handouts exported as PDF sometimes carry leftover watermarks from the source tool. Clean them up before sharing.
Inherited Documents
PDFs from other teams or vendors sometimes arrive with watermarks you didn’t add. If you have the right to use the content, remove the overlay.
Detection and Removal Strategies
The tool auto-detects watermarks and classifies them by type: annotation, OCG layer, or XObject. Each detection gets a confidence rating. You can choose between auto (lets the tool decide), annotation-only, OCG-only, or combined removal strategies.
For OCG removal, which involves rasterization, you can set the output quality: low (72 DPI), medium (144 DPI), or high (216 DPI). Annotation removal is always lossless. A side-by-side preview shows the before and after so you can verify the result before applying.
How It Compares
Watermark removal is tricky because watermarks are embedded in different ways. Most tools only handle the simple cases.
| 功能特色 | OxygenPDF | Adobe Acrobat | Smallpdf |
|---|---|---|---|
| Annotation watermark removal | |||
| OCG layer watermark removal | Partial | ||
| XObject/transparency detection | |||
| Side-by-side preview | |||
| Configurable output quality | |||
| No file upload required | Desktop only | ||
| Free to use | Limited |
No Upload, No Server
Watermarked documents are often sensitive: they were marked for a reason. Uploading them to a third-party service to remove the marking defeats the purpose of document control.
OxygenPDF detects and removes watermarks entirely in your browser. The PDF stays on your machine. The cleaned output downloads locally. No server ever sees your document.
移除浮水印: 常見問題
關於此工具及其運作方式的常見問題。
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$9 單次付費