Sign PDF Online — Free
Add your signature to PDF documents. Type, draw, or upload a signature image.
200万以上のファイル変換
数千人のユーザーに信頼されています
安全な転送
HTTPS暗号化アップロード
プライバシー優先
処理後にファイルを自動削除
登録不要
すぐに変換を開始
どこでも動作
あらゆるブラウザ、あらゆるデバイス
変換方法
Upload your PDF document.
Create your signature by typing, drawing, or uploading an image.
Position and resize the signature on the desired page.
Click Sign and download your signed PDF.
About Sign PDF
Sign PDF lets you add a visual signature to any PDF document without printing or scanning. Choose from three signature methods: type your name with a handwriting-style preview, draw your signature with your mouse or touchscreen, or upload an image of your existing signature.
Position your signature precisely on any page with our visual editor. Drag to place, resize to fit, and preview exactly how it will look before processing. The signature is embedded directly into the PDF as a permanent visual element, ensuring it appears consistently across all PDF viewers.
Business professionals sign contracts and proposals without printing. Remote workers complete HR documents and expense reports digitally. Real estate agents add signatures to listing agreements and purchase offers. Freelancers sign invoices and statements of work. Students sign permission forms and applications.
The signed PDF maintains full compatibility with all viewers and can be further annotated, printed, or shared. For legal compliance, combine with our PDF encryption tool to add password protection after signing.
Common Use Cases
- •Sign contracts and agreements
- •Complete HR and legal documents
- •Add signature to invoices
- •Sign forms without printing
- •Digital document signing
How It Works
Signatures are embedded as PDF drawing operations (text or image) at precise coordinates. Text signatures use Helvetica font rendering. Image signatures are embedded as PNG graphics with transparency support.