# apphelp tool profile
name: PDF Sign & Stamp
tool: tool-pdfsign
domain: pdfsign.apphelp.net
canonical: https://pdfsign.apphelp.net/en
summary: 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.
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.
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
languages: en, zh-CN, zh-TW, ar, de, fr
seo: locale-routed, canonical, hreflang, sitemap, robots, JSON-LD
geo: llm.txt profile, concise task summary, input/output contract, use-case list, local-first privacy notes
privacy: browser-local processing, no upload by default
limits: visual signatures only (no certificate-based digital signatures); flatten-to-image removes selectable text and increases file size; PDFs up to 50 MB
related: https://pdfwatermark.apphelp.net/en ; https://pdfmerger.apphelp.net/en ; https://imagetopdf.apphelp.net/en
analytics: Microsoft Clarity and Google Analytics (opt-in)
no-login: true