Add Watermark to PDF Online – Text & Logo Watermarks with Live Preview

1. 1Upload your PDF: Click 'Select PDF Document' or drag and drop your file into the upload zone. High-resolution page previews render automatically.
2. 2Choose Watermark Type: Select Text Watermark or Image Watermark.
3. 3Select a Ready-to-Use Preset: Click presets like 'CONFIDENTIAL', 'DRAFT', 'COPY', or 'DO NOT COPY' to instantly apply tailored fonts, colors, and angles.
4. 4Customize Appearance: Adjust opacity slider (5% to 100%), rotation angle (-45°, 0°, +45°), font size, and color palette.
5. 5Choose Placement: Use the 3x3 position matrix (Top, Center, Bottom) or toggle Repeated / Tiled Pattern for page-wide security.
6. 6Target Pages: Apply to all pages, skip the cover page, or specify custom page ranges.
7. 7Apply & Download: Click Apply & Download Watermarked PDF to compile your secure PDF in local browser memory.

Watermarking is an essential safeguard for intellectual property, proprietary business data, and pre-release publications:

• Confidentiality & Non-Disclosure: Mark contracts, trade secret disclosures, and internal memos with prominent diagonal 'CONFIDENTIAL' or 'PRIVATE' stamps.
• Draft Review Cycles: Stamp internal proposals and design specs with semi-transparent 'DRAFT' watermarks to prevent accidental release.
• Brand & Copyright Protection: Overlay company logos or copyright notices across creative portfolios, photography samples, and e-books.
• Court Exhibits & Audit Trails: Stamp discovery records with 'COPY' or 'OFFICIAL' identifiers for document compliance.

• Protecting financial statements: Apply semi-transparent company stamps across quarterly investor decks.
• Academic papers & preprints: Add 'DO NOT DISTRIBUTE' or 'UNDER REVIEW' watermarks to research manuscripts.
• Legal contracts & agreements: Stamp 'CLIENT COPY' or 'DRAFT ONLY' on unsigned contract revisions.
• Preventing unauthorized copying: Use repeated tiled watermarks to prevent screenshotting or unauthorized reproduction.

Unlike traditional cloud services that upload your confidential PDFs to remote servers, ZechKit processes your documents directly inside your browser memory using WebAssembly and client-side JavaScript (pdf-lib). Your files are never uploaded, stored, or inspected by third parties.