clairpdf.
Free · No signup · No software to install

Sign PDF for free

Place your signature using your finger, keyboard or an image.

1Choose my files2Preview3Download

PDF: 30 MB/file, 80 MB total, 120 pages. Images: 20 MB/file, 24 MP, 20 files.

Automatic processing · light on device, heavy on server

PDF outputs keep visible pages and text. Links, interactive forms, annotations and digital signatures are not preserved.

Visual signature only, without a certificate or identity verification. Editing invalidates any existing digital signature.

When should you use this tool?

Add a visible signature to a form or document copy without printing and scanning. Draw with your finger on a phone or with a mouse on a computer. You can also type your name or select an image of your signature.

How to get your result

Open the PDF, choose a page, create the signature and adjust its size and position. Check that it does not cover nearby text before downloading. Keep the original separately: changing a PDF that already has a digital signature invalidates that existing signature.

Prepare a PDF to send: the checklist

Choose · Adjust · Download

How it works

  1. 01

    Choose my files

    Automatic processing · light on device, heavy on server

  2. 02

    Preview

    Place your signature using your finger, keyboard or an image.

  3. 03

    Download

    PDFs and images without the hassle. Choose your files, adjust if needed and download the result. Free, no account, on phone, tablet and computer.

A question?

Is this a certified digital signature?

No. This tool adds a visible mark without a certificate or identity verification. If the recipient requires a certified or qualified signature, use the service they specify.

Are my files uploaded?

Light tasks stay in your browser. Heavy tasks, or local processing lasting over eight seconds, automatically use the server when available. Temporary files are deleted after processing or failure. No account needed.

Good to know

PDF outputs keep visible pages and text. Links, interactive forms, annotations and digital signatures are not preserved.