Adobe's free browser tool for adding your own signature to a PDF: no trial and no expiry, though requesting signatures from others and audit trails need a paid Acrobat plan.

Sign PDF online free (Adobe Acrobat)

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For signing a document yourself, this costs nothing.
Sign in to save the file; otherwise Adobe deletes it after processing.
When you need others to sign and an audit trail, move to a signing service.

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Adobe Express prices in rupees: Free at ₹0 with 5GB of storage and access to 345,000+ templates, and Premium at ₹398.84 a month including GST with 250 generative credits and 100GB. The page also states Airtel customers can claim 12 months of Premium free until 27 January 2027.

Adobe Express pricing (India)

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If you are an Airtel customer, claim the free year of Premium in the Airtel Thanks app.
Premium adds one-click resize and brand kits, the two features small teams use most.

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