Add Electronic Signature PDF on Linux For Free

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Last updated on Sep 20, 2025

How to Add Electronic Signature PDF on Linux with pdfFiller

What does it mean to add an electronic signature to a PDF?

Adding an electronic signature to a PDF involves annotating the document with a virtual signature, which serves the same purpose as a handwritten signature. This process typically utilizes a digital certificate that verifies the identity of the signer and enhances the document's security. The e-signature not only provides legal compliance but also streamlines document workflows, allowing for faster approvals.

Why adding an electronic signature is critical for modern document workflows

The integration of electronic signatures into document workflows offers numerous advantages. It reduces the time spent on manual signing processes, minimizes paperwork, and promotes eco-friendly practices. In an increasingly digital world, being able to quickly sign contracts, agreements, and other important documents can significantly enhance productivity.

Use-cases and industries that frequently add electronic signatures

Various industries benefit from electronic signatures, particularly where documents require urgent approvals. Common use cases include:

  • Real Estate: Signing lease agreements and purchase contracts.
  • Legal: Finalizing contracts and agreements swiftly.
  • Insurance: Processing forms and claims efficiently.
  • Healthcare: Authorizing patient consent forms.

Step-by-step: how to add an electronic signature in pdfFiller

Adding an electronic signature to a PDF in pdfFiller involves the following steps:

  • Log into your pdfFiller account.
  • Upload the PDF document.
  • Click on the 'Add Signature' option.
  • Choose to draw, type, or upload your signature.
  • Place your signature on the document.
  • Save the signed document or send it directly.

Options for customizing signatures, initials, and stamps when you add e-signatures

pdfFiller provides versatile options for customizing your electronic signature. Users can create signatures that reflect their identity, whether by drawing, typing, or uploading an image. Additionally, initials and stamps can be added for further personalization, enhancing recognition and formality in business contexts.

Managing and storing documents after you add an electronic signature

Once you have added an electronic signature to a PDF, pdfFiller allows you to manage and store your documents securely in the cloud. You can categorize documents, set permissions for sharing, and track edits. This capability not only ensures easy access from any device but also maintains the integrity of the signed documents.

Security, compliance, and legal aspects when you add e-signatures

Using electronic signatures is governed by laws such as the ESIGN Act and UETA in the U.S. pdfFiller ensures that all e-signatures comply with these regulations, advocating for security and legal validity. By encrypting documents and implementing secure access controls, pdfFiller maintains a robust security framework.

Alternatives to pdfFiller for electronic signature workflows

Several alternatives exist for adding electronic signatures to PDFs, each with unique offerings. While exploring alternatives, consider factors such as user experience, features, and pricing. Notable competitors include:

  • DocuSign: Known for its widespread adoption and superior integrations.
  • HelloSign: Offers a streamlined user interface and essential features.
  • Adobe Sign: Provides advanced features but may require higher costs.

Conclusion

Adding an electronic signature to a PDF is a pivotal function in enhancing digital document workflows. With pdfFiller, users are empowered to integrate e-signatures seamlessly into their processes, leading to increased efficiency and compliance. Understanding the significance and the steps involved ensures that individuals and teams can leverage this capability effectively.

Collect legally binding electronic signatures the easy way

Edit, sign, send — done!

Quickly edit documents online, add signatures, and send for signing — all from one easy-to-use solution you can access from anywhere.
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Customize your workflow

Send documents to a single recipient or an entire group. Assign roles, set a signing order, and schedule reminders for a smooth, error-free process.
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Collect data efficiently

Create fillable PDF forms and let your recipients complete them from any device. Publish forms online or share them via a direct link to capture data and signatures without chasing people down.
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Track and store documents

Get real-time visibility into the signing process and keep track of all your documents in one place. Your files are stored in secure cloud storage, so you can access them anytime and anywhere.
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Share & collaborate

Need more eyes on a document before sending? Share it with the team to edit or highlight content, redact sensitive information, leave feedback, and exchange comments.
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Maintain security & compliance

Collect signatures in compliance with ESIGN, UETA, eIDAS, and GDPR. Protect your documents with a password, request additional signer authentication, set document expiration dates, and more.
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How to send a document for signature?

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Upload

Upload your document to pdfFiller and click E-sign.
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Add recipients

Choose who needs to sign and add as many recipients as you need.
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Prepare

Drag and drop fillable fields on your document and assign them to specific recipients.
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Finalize & send

Review your recipients, customize the signing order, set reminders, and hit Send.
Upload your document

Who needs this?

Explore how professionals use pdfFiller to get documents signed.
Sales
Human Resources
Legal
Real Estate
Education
Finance
Sales

Sales

Quickly edit contracts, add eSignatures, and send them to clients or vendors for signing without leaving pdfFiller. Track who has signed and who still needs to take action, keeping your business running smoothly.
  • Service agreements
  • Vendor contracts
  • Non-disclosure agreements (NDAs)
  • Purchase orders
Human resources

Human Resources

Create fillable PDF forms for offer letters, employment contracts, and onboarding documents. Let new hires complete and sign them from any device, making the onboarding process accessible and hassle-free for everyone.
  • Offer letters
  • Employment contracts
  • Non-compete agreements
  • Benefits enrollment forms
Real estate

Real Estate

Edit property agreements, add signature fields, and send them to buyers, sellers, or agents for signing. Send documents to a single recipient or an entire group, and track the signing process in real time to ensure timely closings.
  • Purchase agreements
  • Lease contracts
  • Property disclosure forms
  • Inspection reports
Education

Education

Create fillable forms for permission slips, enrollment documents, or policy acknowledgments. Allow parents, students, or staff to complete and sign them from any device. Keep track of all signed documents in one secure place for easy access and compliance.
  • Permission slips
  • Enrollment forms
  • Scholarship applications
  • Teacher contracts
Finance

Finance

Edit financial agreements, add eSignatures, and send them to clients or stakeholders for signing. Allow clients to complete and sign online digital forms from anywhere to simplify loan applications, account openings, and authorizations.
  • Loan agreements
  • Investment contracts
  • Financial statements
  • Payment authorizations

Why sign documents with pdfFiller?

GDPR
AICPA SOC 2
PCI
HIPAA
CCPA
FDA

Ease of use

Users appreciate pdfFiller's intuitive interface and the ability to manage documents from anywhere without clunky desktop software.

More than eSignature

pdfFiller is a complete solution that offers PDF editing, eSignature, file storage, and collaboration under one roof.

For individuals and teams

Whether you work solo or with a team, pdfFiller equips you with all the tools to handle your daily document tasks.

Collect signatures with a trusted, all‑in‑one solution

Try easy-to-use tools for all your document management needs.
Upload your document

pdfFiller scores top ratings on review platforms

Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
I like that I can quickly sign something without printing and scanning signing and scanning again. I can send this out right from here via my email, haven't checked Gmail records yet, but if they've been recorded there, I think I will use this app for years to come.
CM B
What do you like best?
I love how I can get my work done even while traveling. The ability to create and manage forms easily is great, especially with my job's remote workforce.
What do you dislike?
There isn't anything I can think of that I dislike.
What problems are you solving with the product? What benefits have you realized?
My productivity and response time is up.
User in E-Learning
Perfect for my needs! I found it super easy to use - was looking for a product like this and it really met my needs! I have used it for basic tasks and it works great. I feel like if I ever want to do more creative documents that I will need more training. This feature is a bit complicated to me.
Christine D.
THE BEST SUPPORT TEAM I'VE EVER FOUND It is honestly the best and most complete pdf program with all the features. It's fast, intuitive, and their support team is absolutely prompt and efficient. I thought I had to wait like with other programs and help on the Internet, but nothing could be further from the truth: in less than two hours my problem is solved. I am very happy with them.
Bella Valario
Helpful program with good customer support This program makes it much easier to complete a complex form than doing it by hand and the customer support is very responsive.
Charles Gomes
This is my first time using pdfFiller and I m excited about using the other features that it offers. I truly want to gain all the functions and capabilities that are at hand.
Anthony W
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Watch pdfFiller eSignatures in action

Check out a quick video tutorial that shows how to create and place your signature or send a document for signing.

FAQs

If you can't find what you're looking for, please contact us anytime!
Select Annotate PDF from the File menu and select your PDF file to be signed. Click the Image button in the toolbar (it looks like a silhouette of a person) or press Shift+Ctrl+I (that is "I" for Image). Click on document, and a file browser dialog will open. Select the image of your signature.
How to Check a Digital Signature of a File in Linux Check If Gnu Privacy Guard (i.e., GnuPG or GPG) Is Already Installed on Your System. Download the Publisher's Public Key. Import the GPG Key. Download the Pretty Good Privacy (PGP) Signature File. Verify the Signature of the Installer.

Collect signatures with a trusted, all‑in‑one solution

Try easy-to-use tools for all your document management needs.
Upload your document