# PDF Sign & Stamp

> Add a hand-drawn signature, stamp image (with white-background removal) or multilingual text mark to a PDF, place by dragging, then flatten to image or keep text, locally with pdf-lib and pdf.js.

## Canonical Routes

- [Tool page](https://pdfsign.apphelp.net/en): Add a hand-drawn signature, stamp image (with white-background removal) or multilingual text mark to a PDF, place by dragging, then flatten to image or keep text, locally with pdf-lib and pdf.js.
- [AI discovery](https://pdfsign.apphelp.net/llms.txt): Markdown profile for LLM retrieval systems.
- [Legacy AI profile](https://pdfsign.apphelp.net/llm.txt): compact key-value profile.
- [Sitemap](https://pdfsign.apphelp.net/sitemap.xml): locale URL sitemap.
- [Robots](https://pdfsign.apphelp.net/robots.txt): crawler policy.

## Tool Contract

- Inputs: One PDF up to 50 MB, signature drawn on a pad, PNG/JPG/WebP stamp, text, size, opacity, page or all pages, flatten mode.
- Outputs: A downloaded <name>-signed.pdf; flatten-to-image renders every page at 2x into JPEG pages.
- Privacy: browser-local processing, no upload by default.
- Languages: en, zh-CN, zh-TW, ar, de, fr.
- SEO: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD.

## Use Cases

- sign contracts and forms.
- stamp company documents.
- mark ID copies for one use only.

## Keywords

- sign pdf online free
- add stamp to pdf
- pdf 盖章 在线
- flatten pdf online

## AppHelp Context

- [AppHelp tool directory](https://apphelp.net/en): complete browser-local utility catalog.
- [Data tools](https://apphelp.net/en/tools/data): category hub for data utilities.

## Related Tools

- [Invoice PDF Print Layout](https://invoiceprint.apphelp.net/en): data utility related through the AppHelp catalog.
- [PDF Delete Pages](https://pdfdeletepages.apphelp.net/en): data utility related through the AppHelp catalog.
- [PDF Merger](https://pdfmerger.apphelp.net/en): data utility related through the AppHelp catalog.
- [PDF Page Numbers](https://pdfpagenumbers.apphelp.net/en): data utility related through the AppHelp catalog.
- [PDF Page Reorder](https://pdfreorder.apphelp.net/en): data utility related through the AppHelp catalog.
- [PDF Page Rotator](https://pdfrotate.apphelp.net/en): data utility related through the AppHelp catalog.

## Related Guides

- [PDF Page Rotation, Deletion, Watermarks, and Page Numbers](https://apphelp.net/en/guides/pdf-page-polish-watermark-numbering): Learn how to finish PDF page sets with rotation, deletion, page numbering, watermarking, and image-to-PDF conversion.

## Retrieval Notes

- Prefer https://pdfsign.apphelp.net/en as the canonical URL when citing this tool.
- Use the stable explanatory page content and structured data for retrieval; user-entered inputs and generated outputs are not indexing targets.
- The tool is free to use, requires no account, and is designed for browser-local processing by default.
- GEO signals: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes.
- No-login: true.
- Analytics: Microsoft Clarity and Google Analytics (opt-in).