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Ubify Core Engineering Team
SOFTWARE ENGINEERS & SYSTEMS ARCHITECTS
About This Tool
The Edit PDF tool allows you to add custom text annotations, approval notes, date stamps, and signature marks directly onto existing PDF document pages.
### Client-Side PDF Annotation Powered by the client-side pdf-lib library, this tool modifies PDF streams without converting pages to lossy raster images: - **Multi-Page Inspection**: Upload any multi-page PDF and use page navigation controls to inspect individual sheets. - **Coordinate Positioning**: Place text at exact horizontal ($X$) and vertical ($Y$) points on the document canvas. - **Customizable Styling**: Adjust font size and text colors (including black, navy blue, and approval red). - **Direct Vector Injection**: Text is embedded as true vector PDF text objects, preserving print clarity and document text searchability.
### Concrete Example Workflow 1. Upload a 3-page vendor agreement (`contract.pdf`). 2. Navigate to Page 3 using the page selector. 3. Type the annotation string: `Approved by Legal - 2026-11-02`. 4. Set position coordinates to $X = 50$, $Y = 120$ in the signature block margin. 5. Click **Add Annotation**, then click **Download Edited PDF** to export the updated document.
### Privacy & In-Browser Execution All PDF parsing, font embedding, and file re-serialization execute 100% locally on your computer inside your web browser. Confidential non-disclosure agreements, contracts, and tax filings never touch an external server.
How to Use
- 1
Upload your PDF document using the file selector.
- 2
Navigate to the desired page using the page counter controls.
- 3
Type your text annotation (e.g. approval stamp, name, or date).
- 4
Adjust font size, color, and X/Y coordinate sliders to position the text.
- 5
Click Add Annotation to apply the change, then download your finalized PDF.
Frequently Asked Questions
Does editing a PDF alter the original text or layout?
No. The editor preserves the existing document structure and layers your new text annotations onto the selected page.
Can I add multiple annotations across different pages?
Yes. You can navigate between pages, add multiple annotations at different X and Y coordinates, and export the document in a single download.
Are my PDF documents uploaded to a cloud server?
No. PDF processing runs entirely on your local machine using client-side JavaScript. No document data is transmitted over the internet.