Sign PDF Online – Add Signature to Documents

Need to sign a contract, an offer letter, a lease agreement, or a consent form — without printing, scanning, or installing any software? Electronic PDF signatures are fully legal in most countries and take less than 60 seconds to apply. This guide covers every free method to sign a PDF online or offline, from drawing your signature with a mouse to generating a legally binding digital certificate — all without a printer in sight.

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Are Electronic Signatures Legally Binding?

Yes — in most countries, electronic signatures carry the same legal weight as handwritten ones. In the USA, the ESIGN Act (2000) and UETA make e-signatures legally valid. The EU recognises them under eIDAS regulation. The UK under the Electronic Communications Act. India under the IT Act. Pakistan under PECA 2016. For highly regulated documents (wills, property deeds, court orders), check local requirements — some still require wet ink. For everyday business contracts, NDAs, offer letters, and forms, an electronic signature is fully binding.

4 Types of PDF Signatures Explained

Before choosing a method, understand the four signature types — they differ in how they look, how they're created, and their legal standing:

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Drawn Signature

Draw your signature with a mouse, trackpad, or finger on a touchscreen. Most natural-looking option — closely resembles a real handwritten signature.

🖱️ Mouse / Finger

⌨️

Typed Signature

Type your name and choose from cursive-style fonts. Fastest method — generates a professional-looking signature in seconds with zero drawing skill needed.

⌨️ Keyboard

🖼️

Uploaded Image Signature

Sign a white piece of paper, photograph it, then upload the image. Best for replicating your exact real-world signature digitally.

📷 Photo Upload

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Digital Certificate Signature

Cryptographically verified signature tied to a digital certificate. Tamper-proof — any modification after signing invalidates it. Required for some legal and government documents.

🏛️ Enterprise / Legal

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Which Type Should You Use?

For 95% of everyday signing — contracts, HR forms, NDAs, consent forms, rental agreements — a Drawn or Typed signature is perfectly sufficient and legally valid. Digital Certificate signatures are needed only for government submissions, court documents, or financial instruments that specifically require one.

Method 1 — ProPDFMaker Sign PDF (No Upload, Any Device)

ProPDFMaker — Draw, Type or Upload — Zero Upload to Server

✅ Free 🔒 No Upload 🌐 Any Browser 🏆 Recommended 🚫 No Sign-Up

ProPDFMaker's Sign PDF tool lets you draw, type, or upload a photo of your signature and place it anywhere on your PDF — entirely inside your browser. Your document is never uploaded to any external server at any point. Supports adding multiple signatures, initials, dates, and text fields. Works on desktop, tablet, and mobile.

Open the ProPDFMaker Sign PDF tool in any browser on any device.
Click Choose File or drag and drop your PDF into the tool. The document opens in the browser-based editor.
Click Add Signature from the toolbar. Choose your method: Draw (mouse or finger), Type (cursive font), or Upload Image (photo of handwritten signature).
Create your signature and click Apply.
Drag your signature to the correct position on the page. Resize using the corner handles. Add initials or date fields if needed.
Click Download Signed PDF to save the completed document to your device.

✍️ Sign PDF Now 📝 Fill PDF Form

💡 Zero-upload = maximum privacy. Contracts, medical forms, and legal documents never leave your device during the signing process — unlike every other tool on this list that uploads your file to a third-party server.

Method 2 — Adobe Acrobat Reader (Free Desktop App)

Adobe Acrobat Reader — Fill & Sign (Free, Offline)

✅ Free Reader 💻 Offline 🔒 No Upload 🪟 Win 🍎 Mac

Adobe Acrobat Reader — the free version — includes a fully functional Fill & Sign tool that lets you type, draw, or upload a signature and place it anywhere in any PDF. It runs entirely offline with no file upload. Signatures are saved for reuse across future documents. See Adobe's official Sign PDF guide for full details.

Open your PDF in Adobe Acrobat Reader (free download at get.adobe.com/reader).
Click Fill & Sign in the right-hand Tools panel (or go to Tools → Fill & Sign).
Click Sign in the toolbar that appears, then select Add Signature.
A popup offers three options — Type (cursive font), Draw (mouse/trackpad), or Image (upload photo). Create your signature and click Apply.
Click where you want the signature placed on the document. Drag to reposition, or use the resize handles to scale it.
Save the signed PDF via File → Save As — save as a new file to preserve the original unsigned version.

⬇️ Download Adobe Reader Free 💳 Acrobat Pro Pricing

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Save Your Signature for Reuse

Adobe Reader saves your signature after the first use. Tick "Save signature" when creating it — on future documents, your stored signature will appear instantly without having to re-draw or re-type it.

💡 Adobe Reader's Fill & Sign is the gold standard for offline PDF signing. It is the most widely installed PDF tool in the world and supports all three signature creation methods with no file upload or account required.

Method 3 — Smallpdf eSign PDF (Free Online)

Smallpdf — Fast Online Signing, No Printing Needed

✅ Free 🌐 Online ⚡ Fast 📱 Mobile OK

Smallpdf's eSign PDF tool lets you upload a PDF, draw your signature, add initials and date fields, and download the signed document — all for free with no printing or scanning. Smallpdf is GDPR compliant and ISO/IEC 27001 certified. It deletes uploaded files from their servers within 1 hour of processing.

Visit smallpdf.com/sign-pdf in your browser.
Click Choose File or drag and drop your PDF onto the page.
Click Add Signature — draw, type, or upload an image of your handwritten signature.
Place your signature on the relevant page, then add text, initials, or date stamps as needed.
Click Finish & Sign to finalise, then download the signed PDF.

🚀 Try Smallpdf eSign 💳 View Pricing

💡 Smallpdf also supports requesting signatures from others on its Pro plan — useful when you need a colleague or client to counter-sign the same document remotely.

Method 4 — iLovePDF Sign PDF (Free, Batch & Request Signatures)

iLovePDF — Sign Solo or Request Signatures from Others

✅ Free 🌐 Online ⚡ Multi-Party 🚫 No Account (Solo)

iLovePDF Sign supports two workflows: signing a document yourself instantly (no account needed), or sending the document to multiple signers by email with tracked signing status. It provides a complete eSignature workflow for teams and businesses — making it the most versatile free option for multi-party signing on this list.

Sign It Yourself (No Account):

Go to ilovepdf.com/sign-pdf and click Only Me.
Upload your PDF and click Sign PDF.
Choose Signature, Initials, or Stamp from the panel on the right.
Draw, type, or upload your signature, then place it on the document.
Click Finish and download the signed PDF.

Request Signatures from Others:

On the iLovePDF Sign page, select Multiple Signers.
Upload the PDF and add each signer's name and email address.
Place signature fields for each signer on the relevant pages.
Click Send for Signature — each signer receives an email and signs online. You are notified when all parties have signed.

🚀 Try iLovePDF Sign 💳 View Pricing ℹ️ All iLovePDF Tools

💡 iLovePDF's multi-signer workflow sends each person a unique signing link via email — you can track who has signed and who is pending, all from a single dashboard. Perfect for contracts that need two or more signatories.

Method 5 — Sejda Fill & Sign (Free, No Registration)

Sejda — Free PDF Form Filler & Signature Tool

✅ Free 🌐 Online 🚫 No Registration ⚡ No Watermarks

Sejda's Fill & Sign tool is completely free with no watermarks and no registration required. It combines PDF form filling with signature placement in a single interface — ideal for filling in form fields AND adding your signature to the same document in one step. Uploaded files are deleted automatically after 2 hours.

Visit sejda.com/sign-pdf and click Upload to select your PDF.
Once the document loads, click Sign in the top toolbar, then Add Signature.
Choose from three creation methods: Type your name (cursive), Draw (mouse/touchscreen), or Upload an image.
Create your signature and click Save, then click on the page where you want it placed.
Fill in any remaining form fields using the text tool, then click Download to save the completed, signed PDF.

🚀 Try Sejda Free 💳 View Pricing

💡 Sejda is one of the few tools that offers no watermarks on its free tier — making it an excellent option when you need a clean signed document without a paid subscription.

Method 6 — PDF24 Sign PDF (Free, Desktop & Online)

PDF24 — Free Sign Tool, Online & Offline Windows App

✅ Free 🌐 Online 💻 Desktop App 🪟 Windows 🔒 Offline Option

PDF24's Sign PDF tool is available both as a free online tool and as a Windows desktop app that runs fully offline. It has no file size limits, no watermarks, and no daily caps. The desktop version is the best choice for users who regularly sign documents and need a fully offline, no-upload solution on Windows.

Using PDF24 Online:

Go to tools.pdf24.org/en/sign-pdf.
Upload your PDF and wait for the editor to open.
Click Add Signature and draw, type, or upload your signature.
Place the signature on the page and adjust size as needed.
Click Save and then download the signed PDF.

Using the PDF24 Desktop App (Offline):

Download the free PDF24 Creator desktop app for Windows.
Open PDF24 → select Sign PDF from the toolbox.
Open your PDF and add your signature using Draw, Type, or Image upload.
Save the signed file — entirely offline, no internet required.

🚀 Try PDF24 Online ⬇️ Download Desktop App

💡 The PDF24 desktop app is ideal for professionals who sign multiple documents daily — it processes everything locally on your Windows PC, and no internet connection is required after installation.

Method Comparison at a Glance

Use this table to pick the right signing method based on your privacy needs, device, and whether multi-party signing is required.

#	Method	Free	No Upload	No Sign-Up	Multi-Party	Mobile
1	ProPDFMaker Sign	✅ Yes	✅ Yes	✅ Yes	✗ No	✅ Yes
2	Adobe Acrobat Reader	✅ Free tier	✅ Desktop	⚠️ Account needed	⚠️ Pro only	✅ App
3	Smallpdf eSign	✅ Free tier	✗ Uploads	✅ Yes	⚠️ Pro only	✅ Yes
4	iLovePDF Sign	✅ Free tier	✗ Uploads	✅ Solo signing	✅ Yes (free limit)	✅ Yes
5	Sejda Sign	✅ Yes	✗ Uploads	✅ Yes	✗ No	✅ Yes
6	PDF24 Sign	✅ Yes	✅ Desktop app	✅ Yes	✗ No	⚠️ Online only

How to Create a Clean Signature Image for Upload

If you prefer to use an image upload so your digital signature exactly matches your real one, follow these steps to create a clean, high-quality signature image:

Use white paper and a dark pen — black or dark blue ink provides maximum contrast. Avoid ruled paper; plain white gives the cleanest result.
Sign large — sign bigger than you normally would. Larger signatures photograph with more detail and scale down more cleanly than small ones scaled up.
Photograph in good lighting — natural daylight works best. Avoid shadows across the signature. Take the photo directly above the paper, not at an angle.
Crop tightly — use your phone's photo editor to crop right to the edges of your signature, removing all excess white space.
Save as PNG with white background — PNG preserves sharp edges. If your tool supports it, use a transparent background so the signature blends naturally over any PDF.
Remove the background (optional) — free tools like remove.bg can strip the white background, leaving just the signature strokes on a transparent layer — ideal for clean overlaying on any PDF.

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Protect Your Signed PDF After Signing

Once signed, protect your document from further modification. Use our Password Protect PDF tool to lock the file with AES-256 encryption, or our Watermark PDF tool to add a "SIGNED" or "CONFIDENTIAL" stamp across all pages before distributing. You can also compress the signed PDF if it needs to be emailed within an attachment size limit.

Frequently Asked Questions

Is an electronic signature the same as a digital signature?

No — these are different things. An electronic signature is any mark applied to a document to indicate intent to sign — a drawn signature, typed name, or image upload. A digital signature is a cryptographically verified certificate-based signature that proves identity and ensures the document has not been altered. For most contracts and business documents, an electronic signature is sufficient. Digital signatures are required for certain government, legal, or financial instruments. ProPDFMaker's Sign PDF tool creates electronic signatures.

Can I sign a PDF on my iPhone or Android phone for free?

Yes — open ProPDFMaker's Sign PDF tool in Safari (iPhone) or Chrome (Android) and draw your signature with your finger directly on the touchscreen. Smallpdf and iLovePDF also work well on mobile browsers. All three require no app download and no account for basic signing.

How do I sign a PDF without Adobe Acrobat Pro?

The free version of Adobe Acrobat Reader includes a full Fill & Sign tool — you do not need Pro. Alternatively, ProPDFMaker Sign PDF, Sejda, and PDF24 are all completely free alternatives with no Adobe account required.

Can I add multiple signatures to the same PDF?

Yes — all tools listed in this guide support placing multiple signatures on the same document. This is useful for PDFs with multiple signature fields (e.g. both parties signing a contract, or signing and initialling on different pages). Use the ProPDFMaker Sign tool or iLovePDF to add as many signature, initials, and date fields as needed across any number of pages.

Will someone be able to remove my signature from the PDF?

A basic electronic signature applied as an image can technically be removed by someone with PDF editing software. To prevent this, use our Password Protect PDF tool to set a Permissions Password — this blocks editing while still allowing the document to be opened and viewed. For tamper-proof signing where any modification invalidates the signature, a digital certificate signature via Adobe Acrobat Pro is required.

How do I send a PDF to someone else for them to sign?

iLovePDF Sign and Smallpdf eSign both offer multi-party signing workflows — you upload the document, add the other party's email, place signature fields for them, and send. They receive an email with a signing link, sign online, and you are notified when done. This is included in their free tiers with limits, or unlimited on paid plans.