Watermark PDF documents online for free. Add text overlays, logos, and security stamps while preserving searchable text. 100% private.
打开 MediaWatermark Pro →Add professional watermarks to your PDF documents without destroying text searchability. Our native PDF engine preserves the document structure while adding overlay or underlay watermarks. Perfect for contracts, proposals, reports, and confidential documents. Choose between visible text stamps, logo overlays, or invisible digital watermarks.
所有处理在浏览器内存中使用WebAssembly和WebGPU运行。无服务器。无存储。
拖放文件夹或ZIP文件。设计一次。即时导出完整保护的ZIP。
本地TensorFlow.js检测人脸并智能定位水印。
Yes! Our engine uses native PDF stamping — your text stays fully searchable and the document isn't rasterized.
Yes, use our Template Gallery with pre-built DRAFT, CONFIDENTIAL, and DO NOT COPY templates.
Yes, all processing happens locally so there are no upload limits.
拖放您的照片、PDF或视频。不会上传到任何服务器。
应用自定义文本、上传Logo或即时生成图库式网格图案。
点击导出。通过WebGPU在您的设备上几秒钟内完成本地处理。