Add Electronic Signature PDF on Linux For Free

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Last updated on Jan 4, 2026

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
It was the worst because I had no idea how to work the program. It took well over 5hrs for something that should have taken less than 5 mins had a I known what to do
Anonymous Customer
What do you like best?
I like the ability to send to sign documents the most. I use it in my business daily. I like the features to organize my documents and to make templates. The templates are a life saver. Also, PDF filler has a large library of documents, anyone can easily personalize templates, can prepare add signatures, dates and finalize documents all in one step, saves time, LOTS of time!
What do you dislike?
I like it all. I don't have any complaints.I have used other document signing programs and they are way more difficult to use. No so with PDFfiller. The mobile app is not that easy to use as the (desktop) version. If I had to say Sometimes there is a delay from screen to screen. But that could be connection.
Recommendations to others considering the product:
If you need a document editing tool that does everything you can think of USE PDFFILLER it ROCKS! If you need to use this product to mark up documents and sign, try this product! I like to keep everything that I do 100% electronic, so with products like this, I am able to do so.
What problems are you solving with the product? What benefits have you realized?
I can get leases and contracts signed very easily. I like the ability to get clients to sign contracts and leases on their mobile phones. I now use the program Every Single Day to create, manipulate or convert files that used to sit waiting, sometimes for days at a time, to be done by the one or two people with access to more expensive and less user friendly programs. Now I have a new "can-do" attitude to the workings of .pdf files. I can't recommend this online tool enough and it's so affordable, you can buy a license to use at home. Great product, lots of advantages. You will not look back, you will not regret this purchase.
David Nelson
Much Needed Support When everything in my world is reaching for a way and there is no way in sight, pdfFiller comes through. They come through when I'm up and they come through when I'm down. Unlike any other needed support, you are there even when Im bleeding. Thank you
Princessa J Whitehead
Well I am very new to PDFfiller. Our agency is responsible for billing HMO's and MCO's and this site has been very helpful and useful. I would be interested in learning more.
Kentocc C
Sign it! In general is a very good option to fill and sign documents. I did not buy the paid version because I was in need at the moment and it worked perfect for me. I like the easy to follow process of this software. You dont need to know how to use it. As soon as you start filling any document everything march along the way I did not see any cons because I was able to resolve my needs with the free trial. I would hesitate to pay for this software if I need again.
Lilia M.
We would like become a distributor and sale partner for PDFfiller. We will design documents and forms to sell through PDFfiller. Many thanks in advance foryour cooperation. Best regards,
Marcel D
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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