Lock Document For Free

Create a legally-binding electronic signature and add it to contracts, agreements, PDF forms, and other documents – regardless of your location. Collect and track signatures with ease using any device.
Drop document here to upload
Select from device
Up to 100 MB for PDF and up to 25 MB for DOC, DOCX, RTF, PPT, PPTX, JPEG, PNG, JFIF, XLS, XLSX or TXT
Note: Integration described on this webpage may temporarily not be available.
Last updated on Jan 16, 2026

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Rearrange pages in a PDF document.
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Compress PDFs to reduce their size.
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Convert PDFs into Word, Excel, JPG, or PPT files and vice versa.
Create from scratch
Start with a blank page.
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Upload a document
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Generate your customized signature
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Adjust the size and placement of your signature
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Download, share, print, or fax your signed document

Every eSignature tool you need – inside a powerful PDF software

eSignature solution
Document tracking
Enhanced productivity
Custom branding
Security & compliance

eSign documents and collect signatures

Easily fill, edit, and sign your PDF documents in a single application, on any device.
Type, draw, or use a signature converter to create an eSignature from a picture of your handwritten autograph.
Create fillable PDFs and send them for signature to one or multiple recipients.
Set signer roles and customize a signing order.

Get visibility into the signing process

Receive instant alerts once signatures are in place.
Specify CC’d recipients and set actions upon document completion.
Monitor changes in your documents with audit trails.

Speed up your approval workflows

Send documents for signature faster by sharing them via short links.
Simplify data and signature collection by posting fillable PDF forms online.
Collect payments along with signed documents.

Showcase your branding when requesting signatures

Display your logo on signature invites, user notifications, and in the eSignature editor.
Customize an email message for your eSignature invites.
Redirect signers to your website once they complete your document.

Maintain industry-leading security and compliance

Authenticate signers via a password.
Make your document workflows compliant with industry-specific regulations, including HIPAA.
Secure the authenticity of a document with a unique ID.
Set an expiration date for your document.

Join the world’s largest companies

Employees at these companies use our products.

How to Add a Signature to PDF (and Send it Out for Signature)

Watch the video guide to learn more about pdfFiller's online Signature feature

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pdfFiller scores top ratings in multiple categories on G2
4.6/5
— from 710 reviews
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
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Best Support - Summer 2025
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5.0
What do you like best?
PDFfiller is a great way for me to pre-fill documents that I use on a regular basis for my clients. By having as many fields clearly completed as possible, transactions that may have been held up due to illegible or missing information can be processed much more quickly. Clients also appreciate not having to do as much work! I also like the fact that I can use a social media signin for PDFfiller instead of having to create a separate user ID and password. It's one less thing that I have to remember.
What do you dislike?
Sometimes, I get frustrated by the "auto-detect" feature that highlights an entire line of a form. I'd rather use the text insertion feature and place text where I want it rather than have to edit the whole line. The other frustrating thing is having to make sure you're logged out on one computer before using it on another device in the office!
Recommendations to others considering the product:
I recommend PDFfiller without hesitation, with one caveat: only one sign-in is allowed at a time per user. If you use multiple computers at your place of employment, make sure you're signed out of PDFfiller on one computer before trying to sign on with the other. It will save you some aggravation. This is especially frustrating if you use the program on a desktop and a laptop and forget to sign out of the desktop computer before bringing the laptop home to work remotely. I did do a lot of research before deciding to invest in PDFfiller, and after my due diligence was hard-pressed to find an option with all of the features that I needed and at a price point that I felt was affordable. For the money, PDFfiller is a great investment for offices looking for ease and convenience with pre-filling forms. The learning curve is not very steep, and there is a lot of functionality for adding features besides text: check/"x" in specific boxes, highlighting, erasing, etc. I have used all of those features with little to no difficulty. Erasing is a bit of a science, with some trial and error involved in determining the exact size of the eraser needed for the job. Being able to move inserted text around easily and increase or decrease the font size as needed is a very helpful feature, especially if you want to call attention to certain pieces of information or make them stand out from the rest of the document. While I have not used the signature feature very often, I have found it to be useful in the rare instances that I have needed it. I have a copy of my signature saved in PDFfiller, which makes it very easy to insert a signature field into documents. Clients also appreciate this feature as well.
What problems are you solving with the product? What benefits have you realized?
PDFfiller is making it a lot easier for me to personalize and email forms to my clients, improving their service experience and saving me time and trouble. It's a huge convenience for me and much appreciated by clients whose handwriting is less than clear! The biggest benefit to me is having a library of frequently used documents that I can pull up on the fly, make adjustments and edits to a few fields, and have a new document ready to go in a matter of minutes. I've also been able to add information in the "white spaces" of forms I have created in the past, to include client-specific text, contact information and other items.
Laurie Seubert, Allied ASID
5.0
Sam, on-line support did a great job! I was very happy that Sam at the On-line Support, came on very quickly and helped me with what I needed and waited until I was sure it worked. I was also very happy that the program did "not" shrink the size of the words in the document like many other programs I have tried.
Homai Maier

Sign any document using pdfFiller’s eSignature service without hassle

Add your virtual signature in just a few simple steps – without a scanner or printer.

Upload

Upload your document to pdfFiller and open it in the editor.
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Sign

Generate and save your electronic signature using the method you find most convenient.
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Tweak

Resize your signature and adjust its placement on a document.
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Retrieve

Save a signed, printable document on your device in the format you need or share it via email, a link, or SMS. You can also instantly export the document to the cloud.
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Upload document
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Why choose pdfFiller for eSignature and PDF editing?

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Cross-platform solution

Upload your document to pdfFiller and open it in the editor.
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Unlimited document storage

Generate and save your electronic signature using the method you find most convenient.
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Widely recognized ease of use

Resize your signature and adjust its placement on a document.
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Reusable templates & forms library

Save a signed, printable document on your device in the format you need or share it via email, a link, or SMS. You can also instantly export the document to the cloud.

The benefits of electronic signatures

Bid farewell to pens, printers, and paper forms.
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Efficiency

Enjoy quick document signing and sending and reclaim hours spent on paperwork.
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Accessibility

Sign documents from anywhere in the world. Speed up business transactions and close deals even while on the go.
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Cost savings

Eliminate the need for paper, printing, scanning, and postage to significantly cut your operational costs.
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Security

Protect your transactions with advanced encryption and audit trails. Electronic signatures ensure a higher level of security than traditional signatures.
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Legality

Electronic signatures are legally recognized in most countries around the world, providing the same legal standing as a handwritten signature.
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Sustainability

By eliminating the need for paper, electronic signatures contribute to environmental sustainability.

Enjoy straightforward eSignature workflows without compromising data security

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GDPR compliance

Regulates the use and holding of personal data belonging to EU residents.
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SOC 2 Type II Certified

Guarantees the security of your data & the privacy of your clients.
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PCI DSS certification

Safeguards credit/debit card data for every monetary transaction a customer makes.
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HIPAA compliance

Protects the private health information of your patients.
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CCPA compliance

Enhances the protection of personal data and the privacy of California residents.

Instructions and Help about Lock Document For Free

Lock Document: simplify online document editing with pdfFiller

When moving your document flow online, it's essential to have the right PDF editor that meets your requirements.

All the most widely used file formats can be easily converted into PDF. This makes creating and using most document types easy. You can create a multi-purpose file in PDF instead of keeping its content in different file formats. It is also the best option in case you want to control the layout of your content.

Though many solutions allows PDF editing, it’s hard to find one that covers the range of PDFs editing features available at a reasonable price.

pdfFiller’s editing solution includes features for annotating, editing, converting PDFs into other formats, adding signatures, and filling forms. pdfFiller is an online PDF editor you can use in your browser. You don’t have to download any programs.

Use one of the methods below to upload your document template and start editing:

01
Upload a document from your device.
02
Find the form you need in our catalog using the search field.
03
Open the Enter URL tab and insert the link to your sample.
04
Upload a document from your cloud storage (Google Drive, Box, Dropbox, One Drive and others).
05
Browse the Legal library.

Once you uploaded the document, it’s saved and can be found in the “My Documents” folder.

Use editing tools to type in text, annotate and highlight. Add and edit visual content. Change a document’s page order. Add fillable fields and send documents for signing. Collaborate with users to complete the fields. Once a document is completed, download it to your device or save it to the third-party integration cloud.

How to Use the Lock Document Feature in pdfFiller

The Lock Document feature in pdfFiller allows you to secure your documents and prevent any unauthorized changes or edits. Follow these simple steps to use this feature:

01
Open the document you want to lock in pdfFiller.
02
Click on the 'Lock Document' button located in the toolbar at the top of the page.
03
A pop-up window will appear with options to set a password for the document. Enter a strong password that you can remember but others cannot easily guess.
04
You can also choose to set additional security options such as allowing or disallowing printing, copying, or modifying the document.
05
Once you have set the desired password and security options, click on the 'Lock' button to apply the lock to the document.
06
Congratulations! Your document is now locked and secure. Any attempts to make changes or edits to the document will require the password you set.
07
To unlock the document and make changes, simply open the document in pdfFiller, click on the 'Lock Document' button again, enter the password, and click on the 'Unlock' button.
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Remember to keep your password safe and secure. If you forget the password, you will not be able to unlock the document or make any changes.

By using the Lock Document feature in pdfFiller, you can have peace of mind knowing that your important documents are protected from unauthorized access or modifications.

For pdfFiller’s FAQs

Below is a list of the most common customer questions. If you can’t find an answer to your question, please don’t hesitate to reach out to us.
What if I have more questions?
Contact Support
Click Review > Restrict Editing. Under Editing restrictions, check Allow only this type of editing in the document, and make sure the list says No changes (Read only). Click Yes, Start Enforcing Protection.
First, open the Office document you would like to protect. Click the File menu, select the Info tab, and then select the Protect Document button. Click Encrypt with Password. Enter your password then click OK.
Click the Select a file button above or drag and drop a PDF into the drop zone. Enter a password, then retype it to confirm the password. Click Set password. Download the password protected PDF document or sign in to share it.
Microsoft Word allows users to protect a document by creating a password for it. This password is different from your device's password. Hence, the locked documents cannot be accessed if your device's password is compromised. However, if you lose or forget a password, Word cannot recover your data.
Microsoft 365 includes a file protection feature that allows authors to mark a file as Final. This locks the file, preventing any further editing.

Ready to try pdfFiller's? Lock Document

Upload a document and create your digital autograph now.
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