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Sign PDF

Draw or type a signature and place it on the page.

Select a PDF to sign

Click to choose, or drop a file here

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Fill & Sign PDFFill in a PDF form and sign it — type text, tick boxes, add dates, drop your signature and initials anywhere.Redact PDFBlack out and permanently flatten sensitive areas.Protect PDFAdd a password to a PDF, encrypted with AES-256.Unlock PDFRemove a known password from a PDF.

Ký PDF — frequently asked questions

Is this a legally binding e-signature?+

This creates a visual signature image placed on the page — it's not a certified digital signature with identity verification. For contracts that require legal e-signature compliance, use a dedicated e-signature service.

Can I save my signature for reuse next time?+

Not currently — you'll draw your signature fresh each time you use the tool, and nothing is stored.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The AI tools that used to send extracted text to a server are currently disabled.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.

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