Free Alternatives to Adobe Acrobat Reader for Signing a Contract

Acrobat Reader is already free, so "free alternative to Acrobat Reader for signing" usually means something more specific: you do not want to install a heavy desktop app, you do not want an Adobe account nagging you toward a paid plan, or you just need to fill one form and sign it once without any of that. This guide (published by Adira, which sells contract review and lifecycle software, so we have a commercial reason to want you signing contracts more carefully, though every tool below is free and works whether or not you ever touch our product) tests six real free ways to fill in a PDF form and add a signature: Adobe's own free browser tool, Xodo, PDFgear, LibreOffice, the signing features already built into macOS Preview and Microsoft Edge, and Weave, Adira's free browser tool for reading and marking up a contract before you sign it. It also covers the one thing almost none of these tools tell you plainly: a signature you draw, type, or apply with a self-made certificate is not the same thing, under Indian law, as the signature a court will presume is genuine.

The comparison, tested

Free-tier terms and app pricing change often. Treat this as a snapshot checked in September 2026, and re-verify on the vendor's own site before you rely on a specific limit.

Tool	Draw / type / image signature	Certificate (DSC) signing	Fill form fields	Free limit	Watermark	Data location
Adobe Acrobat Reader (desktop, baseline)	Yes, via Fill & Sign	Yes, using a local self-signed Digital ID, built in, no Pro subscription needed	Yes, native AcroForm filling	None; free forever for reading, filling, and signing	None	Local by default; only uploads if you choose Adobe Document Cloud
Adobe's free browser tool (acrobat.com)	Yes, draw, type, or upload an image	No; certificate signing needs the desktop app	Yes, basic form filling	No published document cap, but pushes an Adobe account sign-in and nudges toward a paid Acrobat trial	None on the signed file itself	Uploaded to Adobe's servers to process
Xodo (free Reader app / web signer)	Yes, draw, type, or image	No on the free app; certificate/Digital-ID signing is a paid Xodo PDF Studio feature, not free	Yes	Reader app: unlimited, local. Free web signer: capped at one PDF per day	None	Local for the desktop/mobile Reader app; uploaded for the web signer
PDFgear (desktop app)	Yes, draw, type, or image	No	Yes, plus annotation tools	None stated; free, no signup	None	Local; PDFgear's desktop app processes core PDF edits, including signing, on your device
LibreOffice (Draw / Writer)	Yes, but manual: insert a signature image or a typed text box into the PDF in Draw, then export	Yes, if you already hold an X.509 certificate in your OS keystore, using File > Digital Signatures on PDF export	Limited; not built for interactive AcroForm filling the way dedicated tools are	None	None	Fully local, fully offline
macOS Preview (built in)	Yes, draw with the trackpad or capture an ink signature with the camera; typed text via a text box	No, Preview does not do certificate-based signing	Yes, native form filling	None; built into every Mac	None	Fully local
Microsoft Edge (built in, PDF reader)	Draw and type only; no image import	No	Yes, native form filling	None; built into Edge	None	Fully local
Free e-sign vendor tiers (DocuSign, Zoho Sign, Dropbox Sign)	Yes, standard click-to-sign	No, by default	Varies by vendor	Varies; see the full comparison below	Varies	Usually vendor-hosted, outside India by default
Weave (Adira, free)	Not a signing tool	Not a signing tool	Not applicable	None, fully free	None	In-browser, never uploaded

Sources for the table: Adobe's guide to digital signatures in Acrobat and Reader, Xodo's digital signature options support page, Xodo PDF Studio pricing, PDFgear's sign-PDF page, LibreOffice's Digital Signature in PDF Export help page, Apple's guide to filling and signing PDFs in Preview, and vendor free-tier pages for DocuSign, Zoho Sign, and Dropbox Sign, checked directly on each vendor's pricing page.

What we found testing each tool

Adobe Acrobat Reader is the baseline everyone here is trying to avoid, but the free desktop app already does more than most people assume: Fill & Sign draws, types, or drops in an image signature at no cost with no document cap, and Reader can also generate a self-signed Digital ID and apply a real cryptographic signature, free, without an Acrobat Pro subscription. Most people looking for an "alternative" are really avoiding the install size and account nagging, not a missing feature.

Adobe's free browser tool (the online sign-pdf page at acrobat.com) skips the install, convenient for a one-off signature. The trade-off: your file uploads to Adobe's servers, and the flow steers you toward an Adobe account and then a paid Acrobat trial for anything beyond the basics.

Xodo's free reader app draws, types, or places an image signature locally, no upload, no cap. The catch is certificate signing: Xodo's real Digital-ID/DSC-import feature lives in Xodo PDF Studio, a separate paid product starting around $12.99/user/month, not the free reader. If a review calls Xodo "free certificate signing," check whether it means the free reader (draw/type/image only) or paid Studio.

PDFgear delivers on its free tier: draw, type, or image signatures, no watermark, no signup, with its desktop app running core PDF operations, signing included, on your own device. It offers no certificate-based signing at all, so it sits in the same legal category as any drawn signature, covered below.

LibreOffice is the least polished for this job but the most capable in one respect most comparisons miss: a PDF opens as a Draw document, so you can insert a signature image or a typed text box anywhere, offline, and its PDF export genuinely supports Digital Signatures, applying a real X.509 certificate-based signature if you already hold one in your OS keystore. Clunkier than a dedicated Fill & Sign tool for form fields, but the only tool here doing both visual and certificate signing, fully free, fully offline.

macOS Preview is a quietly strong option on a Mac: draw with the trackpad, or hold a signed paper up to the camera for Preview to capture and reuse, plus native form filling. No certificate-based signing.

Microsoft Edge's built-in PDF reader draws or types directly onto a document and fills form fields, locally, with zero setup. What it produces is explicitly a visual mark, not a cryptographic signature, closer to a scribble on a printout than a reusable signature image or a certificate-based one.

Weave is not a signing tool, and it should not pretend to be one. It is Adira's free, in-browser tool for reading a contract and marking up specific clauses, including the execution clause, before you decide how to sign anything, with nothing ever uploaded.

The India honesty core: a certificate is not automatically a DSC

Here is the mistake this comparison exists to prevent: Adobe Reader and LibreOffice can both apply what looks, in the interface, like a proper "digital signature," complete with a certificate icon and a green checkmark. That is not automatically the same thing India's Evidence Act treats specially. Whether a signature counts as legally "secure" turns on where the certificate came from, not on whether the tool shows one.

Section 10A of the Information Technology Act, 2000 protects any contract formed electronically, drawn, typed, or clicked:

"Where in a contract formation, the communication of proposals, the acceptance of proposals, the revocation of proposals and acceptances, as the case may be, are expressed in electronic form or by means of an electronic record, such contract shall not be deemed to be unenforceable solely on the ground that such electronic form or means was used for that purpose." Source: Section 10A, Information Technology Act, 2000, Indian Kanoon

So every method in the table above, including a plain trackpad scribble in Preview, forms a binding contract. What none of them get automatically is the court presumption reserved for a "secure electronic signature." Section 15 of the Act sets that bar:

"An electronic signature shall be deemed to be a secure electronic signature if, (i) the signature creation data, at the time of affixing signature, was under the exclusive control of signatory and no other person; and (ii) the signature creation data was stored and affixed in such exclusive manner as may be prescribed." Source: Section 15, Information Technology Act, 2000, Indian Kanoon

And Section 85B of the Indian Evidence Act, 1872 is what actually flips the burden of proof once that bar is met:

"In any proceedings, involving secure electronic signature, the Court shall presume unless the contrary is proved that (a) the secure electronic signature is affixed by subscriber with the intention of signing or approving the electronic record..." Source: Section 85B, Indian Evidence Act, 1872, bare act text (Devgan.in)

In practice, "prescribed" and "reliable" means a certificate issued through the Section 3A route: a Digital Signature Certificate from a CCA-licensed Certifying Authority, or an Aadhaar eSign through a licensed intermediary. A self-signed Digital ID generated in Adobe Reader, or pulled from your own OS keystore in LibreOffice, satisfies neither. It is cryptographically real, tampering after signing is detectable, but nobody independently verified the key belongs to you, the entire point of a Certifying Authority. It sits in the same evidentiary bucket as a drawn signature: valid, but yours to prove if the other side denies it.

The test you can run: after applying any "digital signature" in Reader, LibreOffice, or any other tool, open the signature panel and check the Issuer field. Your own name or "self-signed" means a cryptographically-real but legally-unrecognised signature. eMudhra, (n)Code Solutions, Capricorn, Sify, NSDL e-Governance, or CDAC means a real DSC or Aadhaar eSign, and the Section 85B presumption applies. For the full comparison of DSC, Aadhaar eSign, and click-to-sign, see Aadhaar eSign vs DSC vs click-to-sign; for the wider set of free e-signature routes in India, including a genuinely free Section 85B-grade signature through DigiLocker, see free e-signature tools for contracts in India.

None of the tools in this comparison work on the documents the IT Act excludes from its scope entirely: a negotiable instrument other than a cheque, a power of attorney, a trust deed, a will, or a contract for the sale or conveyance of immovable property. Those still need wet ink, regardless of which free tool's signature you tried to apply.

Stamping is a separate step, and none of these tools handle it

Nothing above touches stamp duty. A PDF signed with any tool in this table, self-signed certificate included, is still an instrument under the Indian Stamp Act, 1899 and the applicable state Stamp Act, and duty attaches to the document itself, not to how it was signed. You arrange stamping separately; an instrument that should have been stamped but was not risks being treated as inadmissible in evidence.

A privacy test before you sign anything sensitive

Before dropping a real, unsigned contract, a salary figure, or a bank account number into any browser-based tool above, run a two-minute check: open your browser's developer tools (F12), go to the Network tab, and upload a throwaway test PDF. A large POST request firing off to the tool's own domain confirms the file is uploaded and processed on a server; almost nothing appearing there is a genuine sign the work is happening locally. By the vendors' own documentation, Adobe Reader, Xodo's desktop/mobile reader, PDFgear's desktop app, LibreOffice, Preview, and Edge all process locally by default; Adobe's browser tool and Xodo's free web signer both require an upload. A contract that identifies a real person is personal data under Indian law from the moment it does, not only once stamped "confidential," and Section 8(5) of the Digital Personal Data Protection Act, 2023 states the underlying duty plainly: a data fiduciary "shall protect personal data in its possession or under its control... by taking reasonable security safeguards to prevent personal data breach." Prefer a local tool for anything sensitive, or run the test above on an unfamiliar site first.

Red flags

Normal	Red flag	Why it matters
A drawn, typed, or image signature is used for a low-stakes internal approval	The same drawn or self-signed-certificate signature is used for a high-value or first-time-counterparty deal	You lose the Section 85B presumption exactly where a dispute is most likely
Certificate issuer field shows a CCA-licensed CA (eMudhra, NSDL, CDAC, etc.)	Certificate issuer field shows your own name or "self-signed," and nobody checked	A self-signed certificate looks identical to a real DSC in the interface but carries none of its evidentiary weight
A tool's certificate-signing feature is confirmed as part of the free plan before relying on it	A "digital signature" feature turns out to be a paid add-on (as with Xodo PDF Studio) discovered only after signing	You may believe you have a secure signature and have actually applied nothing of the sort
A confidential contract is signed in a local, offline tool (Reader, Xodo reader, PDFgear desktop, LibreOffice, Preview, Edge)	The same confidential contract is uploaded to an unfamiliar "free PDF sign" site found through an ad	An unfamiliar destination may log or retain an uploaded contract with no stated data terms
A power of attorney, will, trust deed, or property sale agreement is executed on paper	Any of these is signed through a free PDF tool "because it was quick"	First Schedule documents are outside the IT Act's scope; no e-signature validly executes them
Stamping is arranged separately, regardless of which free tool signed the document	The signed PDF is treated as fully executed with no thought given to stamp duty	Duty attaches to the instrument, not to the signature method used to create it
The signer's audit trail (who signed, when, from where) is exported and kept somewhere retrievable	The only record of who signed is the visual mark itself, with no timestamp or identity log kept anywhere	If the signature is denied later, you have nothing beyond the mark itself to prove who applied it

Fixing a clause written for "just sign the PDF"

Bad (common in fast-moving vendor and freelance agreements): "This Agreement is validly executed by either Party affixing an electronic or scanned signature to this document, and such signature shall be treated as an original for all purposes."

What is wrong: it treats a drawn signature, a self-signed digital certificate, and a licensed DSC as legally interchangeable, when only some of them carry the Section 85B presumption, and it says nothing about who keeps proof of who actually signed.

Better: "This Agreement may be executed and delivered electronically. Execution by a signature applied using any free or paid PDF tool (drawn, typed, image-based, or a self-generated digital certificate) is sufficient for Agreements not exceeding INR [X] in value, provided the signing party retains a record of the signer's identity, date, and method used. For Agreements exceeding INR [X], or where either Party reasonably anticipates a dispute, execution shall use a Digital Signature Certificate issued by a Certifying Authority licensed by the Controller of Certifying Authorities, or Aadhaar eSign, each a secure electronic signature under Section 15 of the Information Technology Act, 2000 for the purposes of Section 85B of the Indian Evidence Act, 1872. This clause does not apply to any document that, under the First Schedule to the Information Technology Act, 2000, requires physical execution, and does not affect either Party's obligation to pay applicable stamp duty."

What changed and why: it stops treating every "digital signature"-looking output as equivalent, ties the method to deal value or dispute risk, names the licensed route for anything that matters, and keeps the First Schedule and stamping carve-outs explicit rather than assumed.

How this interacts with related pages

Which tool fills and signs a PDF is a different question from which signature method carries legal weight. Read this alongside free e-signature tools for contracts in India for the fuller comparison of DocuSign, Zoho Sign, Dropbox Sign, and the free Aadhaar eSign route through DigiLocker, and Aadhaar eSign vs DSC vs click-to-sign for the legal comparison this page's certificate discussion assumes.

US and global contrast

In the US, the federal ESIGN Act and the state-level Uniform Electronic Transactions Act treat a reliable signature, drawn, typed, or clicked, plus a decent audit trail, as generally sufficient; there is no separate government-certified "secure" tier carrying an automatic court presumption the way Section 85B creates in India. That is why Reader, Xodo, PDFgear, Preview, and Edge are all built around the drawn/typed/image signature: for most of their users, that is legally adequate at home. India layers a second tier on top through Section 15 and Section 85B, one none of these general-purpose free tools reach unless the certificate genuinely traces back to a CCA-licensed Certifying Authority.

FAQ

Is a signature I draw in a free PDF tool legally valid in India? Yes. Section 10A protects any contract formed electronically, including one signed with a drawn, typed, or image signature. It does not automatically get the Section 85B court presumption, reserved for a "secure electronic signature."

Does Adobe Acrobat Reader's built-in digital signature count as a real DSC? Only if the certificate behind it was issued by a CCA-licensed Certifying Authority. Reader's free self-signed Digital ID produces a real cryptographic signature, but nobody independently verified the key is yours, so it does not carry the Section 85B presumption. Check the Issuer field to see which you have.

Which free tool in this comparison actually gives me a real DSC-grade signature? None of them, on their own. LibreOffice can apply a certificate-based signature on export, but only if you already hold a genuine licensed-CA certificate in your OS keystore, a separate purchase or an Aadhaar eSign transaction, not something any tool here issues for free.

Is Xodo's certificate or Digital-ID signing feature free? No. The free reader app handles drawn, typed, and image signatures. Certificate-based Digital ID signing lives in Xodo PDF Studio, a separate paid product.

Do I still need to pay stamp duty if I sign for free with one of these tools? Yes. Stamp duty attaches to the instrument under the Indian Stamp Act, 1899 and the applicable state Stamp Act, regardless of which tool applied the signature.

Which of these tools is safest for signing a confidential contract? Reader, Xodo's desktop/mobile app, PDFgear's desktop app, LibreOffice, Preview, and Edge all process locally by default. Adobe's browser tool and Xodo's free web signer both require an upload. Run the Network-tab test above if unsure about an unfamiliar tool.

This guide gets you to a correct, specific understanding of what each free PDF tool actually does when you sign with it, and whether that signature carries any special weight under Indian law. It does not tell you whether a particular tool or method is adequate for a specific contract, counterparty, or deal size, that depends on facts this page cannot see, and is not legal advice. Talk to a lawyer before finalising a signing policy for a high-value or high-risk agreement.