Add Watermark to PDF and Encrypt PDF for iPhone For Free

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
Based on 12500+ reviews
Last updated on Sep 21, 2025

Add Watermark to PDF and Encrypt PDF for iPhone with pdfFiller

Learn how to add a watermark and encrypt your PDF files using pdfFiller on your iPhone. This process will help you secure your documents and brand your digital assets effectively.

What is adding a watermark to PDF and encrypting PDFs?

Adding a watermark to a PDF involves superimposing a text or image (often identifying the owner) onto a document to prevent unauthorized use. Encrypting a PDF secures it by encoding the content so that only those with the correct password can access it. Both processes enhance document security and enforce copyright protections.

The purpose of adding a watermark to PDF documents

Watermarks serve multiple purposes, including:

  1. 1.
    Protecting intellectual property by marking documents with identifying info.
  2. 2.
    Discouraging unauthorized copying or distribution of your content.
  3. 3.
    Branding documents by including logos or company names.
  4. 4.
    Indicating the document's status, such as “draft” or “confidential.”

How to perform adding a watermark to PDF and encrypting PDF with pdfFiller: step-by-step

Follow these steps to effectively watermark and encrypt your PDF:

  1. 1.
    Open pdfFiller on your iPhone.
  2. 2.
    Select the PDF file you want to edit.
  3. 3.
    To add a watermark, navigate to the “Watermark” tool.
  4. 4.
    Choose your watermark type: text or image, and customize it.
  5. 5.
    To encrypt, go to the “Protect” settings and set a password.
  6. 6.
    Save your changes and download the updated file.

Supported file formats for adding watermarks and encrypting PDFs with pdfFiller

pdfFiller supports a wide range of file formats including:

  1. 1.
    PDF
  2. 2.
    DOC and DOCX
  3. 3.
    PPT and PPTX
  4. 4.
    TXT
  5. 5.
    Image formats like JPEG and PNG

This versatility ensures you can work with various document types while adding watermarks and encryption.

Can you remove or edit a watermark in PDF after adding it?

Yes, watermarks can be removed or edited in pdfFiller. This flexibility allows users to update their watermark as needed, ensuring it remains relevant and effective without the need for newly created documents.

Is a watermark visible on all PDF readers?

Most modern PDF readers will display watermarks. However, the appearance may vary depending on the reader’s capabilities and settings. Always check a few different platforms to confirm visibility.

Does adding a watermark increase the PDF file size?

Generally, adding a simple text watermark will not significantly increase the file size. However, complex images or large logos may lead to a small increase in size, depending on their resolution and compression settings.

Why should you add a watermark to PDFs and other files?

Watermarks are not just aesthetic; they are functional. Adding a watermark to your files enhances security, deters unauthorized use, and increases brand recognition. Whether for personal use or business documents, it's a critical step for document management.

Benefits of using pdfFiller for applying watermarks

Utilizing pdfFiller for watermarking and encrypting your PDFs comes with several advantages:

  1. 1.
    User-friendly interface accessible on iPhone and other devices.
  2. 2.
    Robust security features to protect sensitive information.
  3. 3.
    Customization options for watermarks to suit your branding.
  4. 4.
    Comprehensive features that combine editing, e-signing, and collaboration.

Common use cases for adding watermarks across industries

Adding watermarks is beneficial in various scenarios, including:

  1. 1.
    Publishing: Protecting unpublished manuscripts and drafts.
  2. 2.
    Real Estate: Marking property documents to deter unauthorized use.
  3. 3.
    Corporate: Branding company reports and presentations.
  4. 4.
    Legal: Indicating confidentiality on documents requiring sensitive handling.

Conclusion

Adding a watermark and encrypting PDFs with pdfFiller on your iPhone provides users with essential tools for document security and branding. Whether you are protecting confidential information or enhancing your professional image through branding, understanding these processes is crucial. pdfFiller enables seamless editing, e-signing, and document management from a single cloud-based platform. Start utilizing these features today for a streamlined and secure document handling experience.

Try these PDF tools

Edit PDF
Quickly edit and annotate PDFs online.
Sign
eSign documents from anywhere.
Request signatures
Send a document for eSignature.
Share
Instantly send PDFs for review and editing.
Merge
Combine multiple PDFs into one.
Rearrange
Rearrange pages in a PDF document.
Compress
Compress PDFs to reduce their size.
Convert
Convert PDFs into Word, Excel, JPG, or PPT files and vice versa.
Create from scratch
Start with a blank page.
Edit DOC
Edit Word documents.

Brand your documents with custom watermarks

Add a final touch after editing

Add stamps, dates, and page or bates numbering to ensure PDFs are secure and professional. Customize watermarks by adjusting size, orientation, color, and transparency.
Screen

Clarify your contracts

Avoid confusion when sending documents for review or signing. Stamp them as "Draft", "Final" or "Copy" to add clarity and indicate versions during contract negotiations.
Screen

Share with confidence

Protect documents with watermarks before sharing. Ensure everyone who has access knows their status and owner.
Screen

Organize at a glance

Add watermarks to see which documents are "Drafts", "For Review", or "Archived", saving you from opening the wrong version.
Screen

How to add a watermark to a PDF?

Illustration

1. Upload

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

2. Apply a watermark

Click Watermark at the top to create and customize a watermark.
Illustration

3. Save and export

Apply your changes and choose how to export your document: download, send to cloud storage, save in your account, share, and more.
Upload your document

Who uses this tool?

Learn how professionals use pdfFiller to brand and protect their documents.
Business Owners
Finance
Real Estate
Construction
Healthcare
Education
Legal
Business Owners

Business Owners

Protect intellectual property and maintain brand consistency across all documents. Add a company name to proposals to enhance branding or apply a custom text watermark to internal documents to indicate their status before sharing.
  • Business plans
  • Pitch decks
  • Internal memos
  • Marketing materials
Finance

Finance

Indicate the status of sensitive financial documents to ensure compliance and prevent misuse. Apply text-based watermarks to differentiate between internal review versions and copies intended for client records.
  • Loan agreements
  • Investment contracts
  • Financial statements
  • Tax returns
Real Estate

Real Estate

Brand marketing materials and protect sensitive client information throughout the transaction process. Add an agency name to property listings for brand recognition or apply a text watermark to agreements to clarify their status during negotiations.
  • Purchase agreements
  • Lease contracts
  • Property disclosure forms
  • Inspection reports
Construction

Construction

Safeguard proprietary information when managing project documentation. Apply a protective watermark to project bids before submission or add a status-indicating watermark to blueprints to prevent premature use.
  • Project bids
  • Blueprints
  • Change orders
  • Subcontractor agreements
Healthcare

Healthcare

Protect patient confidentiality and maintain control over sensitive medical records. Apply a custom watermark to patient documents or medical research before sharing to indicate their current status.
  • Patient records
  • Lab results
  • Medical research
  • Billing statements
Education

Education

Manage administrative workflows and control the distribution of study materials. Add a watermark to student records to clarify their official status or stamp submitted applications for better organization.
  • Permission slips
  • Enrollment forms
  • Scholarship applications
  • Unofficial transcripts

Why trust pdfFiller to watermark your documents?

GDPR
AICPA SOC 2
PCI
HIPAA
CCPA

All-in-one solution

Handle all your document tasks in one place. Create and edit PDFs, collect data and signatures, collaborate, and manage files securely in the cloud.

Cloud-native accessibility

pdfFiller is entirely cloud-based and cross-platform, allowing you to access your documents anytime and anywhere, without installing any software or storing files on multiple devices.

Your documents—secured

pdfFiller prioritizes data protection and regulatory compliance through security measures like data encryption and signer authentication.

Watermark PDFs with a trusted, all-in-one solution

Try pdfFiller for all your document management needs.
Upload 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 love it. I will definitely renew when the time come. The Military offer me a free site for forms filler but I can never open it on my personal computer. I have to use it on the government issued computer.
Sallie M
took a while to figure it out. Not sure if I am happy that anyone tyhat fgets a form must log into your online app. Want to have them do it in acrobat reader onlt.
mike k
Ease of use. I was able to tab over to next box throughout the form. There was no need for the prompt, and I. was unable to disable it. Otherwise, it was quick and easy.
Dennis E H
What do you like best?
As a Realtor, my whole business is based on electronic documentation. PDF filler is kind of named poorly, because it really is a PDF editor. It allows you to easily change almost anything on a pdf document...across both desktop and mobile platforms. It simply works as you'd expect it to...every time. I use it practically every day.
What do you dislike?
I wish there were better tools for generating lines (how about a toggle into and out of orthagonal for a line?) It should allow deeper zooming with a thumbnail view showing where you are in the overall document. I like my pdfs to look perfect and sometimes these limit me in that goal.
What problems are you solving with the product? What benefits have you realized?
A Realtor literally lives or dies on his/her electronic documentation. This tool lets me master the changes that inevitably occur with documents. I use it every day.
Arjen Sundman
this site is awesome this site is awesome, ive seen a lot of programs and sites like this but none compare in quality and non are as user friendly! will recommend this site to anyone working with PDF files!!
Charles Patrick Taylor II
Thank you so much for the opportunity… Thank you so much for the opportunity to use pdfFiller it was useful but due to difficulty of internet connection in our place and seldom I use the application, I have decided to cancel. Rest assured that I would also recommend it to my officemates.
Lorelie Asis
Great service Great service, had a problem with some money beikg taken from me which shouldn't have been, either it was my fault or theirs idk doesnt matter. What matters i the support was quick to give it back. Such service isnt seen very much around
Anonymous
What do you like best? I like being able to alter PDFs and forms What do you dislike? yearly subscription is expensive and costly What problems are you solving with the product? What benefits have you realized? It makes it much easier for me to complete forms.
Rachel McNally
Because of distance learning, I am sending assignments to my GED students, and then send back the answers for them to self-grade. This allows me to fill in the assignment and send it back effortlessly!
Anonymous Customer
Show more Show less

Watch PDF watermarking in action

Check out this video tutorial to learn how to protect and personalize your PDFs with custom watermarks.

FAQs

If you can't find what you're looking for, please contact us anytime!
To add a watermark to a PDF on your iPhone, use pdfFiller’s easy-to-navigate interface. Start by opening the app, selecting the PDF you wish to edit, and choosing the 'Add Watermark' option. You can customize the text, font, size, and placement of the watermark. This approach enables you to protect the intellectual property of your documents effectively. For added security, consider encrypting the PDF after adding the watermark. This dual action enhances document security, ensuring that sensitive information is safeguarded.
You can encrypt a PDF file on your iPhone through pdfFiller by first uploading the document to the platform. After editing, navigate to the security settings, where you can set a password for document access. This ensures that only authorized users can view the content. Encrypting PDFs is essential for protecting sensitive information, especially in industries like law or finance. For best practices, use strong passwords combining letters, symbols, and figures to maximize the document's security.
pdfFiller offers a unique fusion of document editing and security features, making it an ideal choice for adding watermarks and encrypting PDFs. The platform allows for seamless integration of these features, catering specifically to the needs of remote professionals and legal teams. Moreover, using a comprehensive service like pdfFiller reduces the need for multiple tools, streamlining your document management process. Be sure to take advantage of its user-friendly interface, which makes these features accessible even to those who may not be tech-savvy.
Yes, you can automate the process of adding watermarks and encrypting PDFs using pdfFiller’s document automation features. This is particularly beneficial for small to medium enterprises (SMEs) that frequently handle standardized documents. By creating templates, you can swiftly apply your predefined watermark and encryption settings to multiple PDFs at once, saving time and ensuring consistency. This not only enhances efficiency but also ensures that all documents comply with your security requirements effortlessly.
Adding watermarks to PDFs can enhance document security by displaying clear ownership and discouraging unauthorized use. However, this alone does not fully protect your document. For comprehensive protection, combining watermarking with encryption is advisable. Using pdfFiller, you can add both features seamlessly, ensuring that your sensitive information is not only marked but also secured against unauthorized access. Always inform stakeholders of the importance of these practices, as it reflects your commitment to data protection.
Absolutely, pdfFiller is designed for cross-platform compatibility, allowing you to edit and secure PDFs seamlessly on various devices, including your iPhone. Whether you’re working from home or on the go, you can easily add watermarks and encrypt documents without losing functionality. This is particularly advantageous for remote professionals who need consistent access to document management tools across devices. Utilize the cloud-based nature of pdfFiller to ensure your documents remain up-to-date and secure, regardless of where they are accessed.

Watermark PDFs with a trusted, all-in-one solution

Try pdfFiller for all your document management needs.
Upload document