Features Demo FAQ

Sign documents.
Privately. Instantly.

Stop uploading your sensitive PDFs to the cloud. AirSign is the beautifully fast, 100% offline desktop app built for professionals who value privacy.

Limited Time Offer
€99 €49 (tax free)
Offer ends in:
30d
00h
00m
00s
Get AirSign for Windows One-time purchase. No subscriptions.
AirSign editor view showing a PDF document loaded and ready to sign
100% Offline
0 Cloud Uploads
1x Payment
Simple

Drag. Drop. Done.

Open any PDF, JPG, or PNG file by simply dragging it into the window. Images are automatically converted to PDF in the background, ready for your signature in under a second.

AirSign upload screen with drag and drop area
Intuitive

Draw your signature
naturally.

Use your mouse or trackpad to draw a fluid, natural-looking signature. Save it once and reuse it across all your documents. Place it anywhere with a single click.

AirSign signature drawing modal with Clear and Save buttons
Precise

Add text. Resize freely.

Type text anywhere on the document and resize it dynamically by dragging the corners. Fill out forms, add dates, notes — everything snaps perfectly into place.

AirSign text editing with resize handles on a document
Legally Binding

Valid under EU & US Law.

Signatures drawn with AirSign are fully compliant as Simple Electronic Signatures (SES) under the eIDAS Regulation (EU) and the ESIGN Act (US), providing legal validity for NDAs, freelance agreements, and everyday business contracts without exposing your data.

See it in action

From opening a file to exporting a signed PDF — in seconds.

FREE WEB TRIAL (1 PDF)

Try AirSign directly in your browser

Upload a PDF, draw your signature, and export 1 document for free to test the speed.

Frequently Asked Questions

Is it really 100% offline?

Yes. AirSign runs entirely on your local machine. We don't have servers, we don't upload your documents, and we don't collect your data. Your PDFs never leave your hard drive.

Are the signatures legally binding?

Absolutely. Signatures drawn with AirSign qualify as Simple Electronic Signatures (SES) and are legally valid under EU (eIDAS) and US (ESIGN) laws for most business contracts, NDAs, and agreements.

Do I have to pay monthly?

No. AirSign is a one-time purchase. You buy it once, and you own the current version forever. No subscriptions, no hidden fees.

Ready to take back your privacy?

Join professionals who trust AirSign to keep their documents safe and local.

Get AirSign Now