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Generate new PDFs from scratch or transform existing documents into reusable templates. Type anywhere on a PDF, rewrite original PDF content, insert images or graphics, redact sensitive details, and highlight important information using an intuitive online editor.

Fill out & sign PDF forms

Say goodbye to error-prone manual hassles. Complete any PDF document electronically – even while on the go. Pre-fill multiple PDFs simultaneously or extract responses from completed forms with ease.

Organize & convert PDFs

Add, remove, or rearrange pages inside your PDFs in seconds. Create new documents by merging or splitting PDFs. Instantly convert edited files to various formats when you download or export them.

Collect data and approvals

Transform static documents into interactive fillable forms by dragging and dropping various types of fillable fields on your PDFs. Publish these forms on websites or share them via a direct link to capture data, collect signatures, and request payments.

Export documents with ease

Share, email, print, fax, or download edited documents in just a few clicks. Quickly export and import documents from popular cloud storage services like Google Drive, Box, and Dropbox.

Store documents safely

Store an unlimited number of documents and templates securely in the cloud and access them from any location or device. Add an extra level of protection to documents by locking them with a password, placing them in encrypted folders, or requesting user authentication.

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What our customers say about pdfFiller

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good solid editor-- would like to see other payment choices, like a quarterly option, and even instead of relying on automatic renewal, send a reminder email prior to the renewal to ensure the user is still consistently using product

Jo Ann L

2014-08-27

I had a little issue trying to find out how to print the form. Also, the little movable box that kept showing me where to check got in the way of reading the document. I X'ed it out most of the time so I could read the instructions.

Ellen K

2018-05-09

PDFfiller Overall, this product is good and I would recommend it to a friend. Like it over Adobe. When I played around with the trial, I liked how you had many options and the program layout was nice. Love the ease of use when trying to alter a pdf. I wish I had a longer trial period and sometimes I could not save a file causing me to save over the original file.

John M.

2020-03-03

All PDF tools in one app My overall satisfaction about that app is a lot, it's just great tool for everyone, for students and also employees as well, at any time people can make change in their document and send it wherever it's needed. That's basically great app, because you can solve all document issues in one app, scanning, adding image to the document putting dates, even signature, saving as pdf, or word or excel, sending to email, printing and etc. which help users to save more time. I remember I faced problem while logging in, actually I think to login for that kind of program is something extra.

Verified Reviewer

2019-10-09

It is a very friendly tool that help us and make the life more easy at the moment we handled a PDF file, is very easy and comfortable, options are also very helpful, I really recommended, I´d have been using this tool for more that a year and is very cool because all your documents are on your dashboard, so is easy to search for old documents that you will wanted to review.

Abdiel

2022-07-25

Filling out Veteran forms made easy This PDF filler is so efficient and easy to learn. I help so many veterans with their forms and always had to print them out and fill them out myself. Thank you for helping me help them and others that cannot fill out forms on their own.

Elizabeth Gutierrez

2021-08-31

I had a free trial with pdfFiller and while the product didn't fit all of my needs the support was very responsive and helpful. It was a good experience all around.

John C

2021-07-22

Immediate refund received I had thought I had cancelled my subscription so was very surprised to get a notification from PayPal that I had been charged $96. I immediately contacted pdfFiller and the matter was sorted out, and a refund received, within a couple of hours. Friendly and efficient service, with no arguments. Very impressed.

Simon Johnston

2021-01-21

Fairly easy to use Fairly easy to use. Would like to combine 2 or more docs into one file so I can fax as a group. I'm sure that's an option; but haven't found it yet...still new at this.

Linda M.

2020-07-16

Add Underline to PDF on Mobile stress-free

Have you ever been exhausted by carrying your laptop around everywhere you go, so that you can keep working with documents? Have you ever your clients backing off just because of an inability to Add Underline to PDF on your Mobile? By using pdfFiller, you're getting the solution that frees you from relying on a software with no cloud storage support, to be able to work from any device, anywhere.

pdfFiller is a web-based PDF editor with advanced functionality for smartphone users and enables you to Add Underline to PDF on Mobile just exactly like you would on your laptop or computer. You can do both and get your documents instantly synced from the cloud storage. Utilize the website, desktop application, or the mobile app. Check out the list below for the best features available on mobile devices:

01

Various supplementary benefits. Notarize your records or send prepared forms right to the IRS in just a few clicks

02

All-round compatibility. Forget about using different tools for computers and mobile phones. Use a universal solution and keep all your records in one storage

03

24/7 support. Contact our friendly customer care service if you encounter difficulties while working with the service

04

Legally-binding eSignature. Use eSignature that’s court admissible and has bank-level security and compliance

05

High-level security. Protect your data with the latest encryption features according to the most important security standards

Manage documents like a professional. Do business right from your browser or install the application. Despite of your choice, all your actions are still secured with the most up-to-date encryption features, so that nobody can get unauthorized access to your data. Don't wait, benefit from professional document management now!

Stay Mobile: Add Underline to PDF on Mobile

Stay Mobile's Add Underline to PDF feature empowers you to enhance your documents with precision. You can easily underline important text on the go, making your mobile PDF editing experience seamless and intuitive.

Key Features

Simple tapping to underline text

Works on any mobile device

Supports various PDF formats

Undo and redo options for editing flexibility

User-friendly interface for effortless navigation

Potential Use Cases and Benefits

Highlight essential information in books or articles

Prepare documents for meetings by marking key points

Assist students in studying by emphasizing critical notes

Prepare reports with visible details for review

Share underlined PDFs directly with colleagues or classmates

This feature solves your problem by allowing you to quickly underline important text anytime and anywhere. You no longer need to print documents or use complex software. With just a few taps, you can highlight the content that matters most, making it easier to recall information when you need it.

Get documents done
from anywhere

Create, edit, and share PDFs even on the go. The pdfFiller app equips you with every tool you need to manage documents on your mobile device. Try it now on iOS or Android!

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

How do I highlight text in a PDF on my phone?

Add markup Tap the Navigate icon and then scroll up, down, left, or right to navigate your way through the PDF to the place where you want to make your markups. Tap and hold the Pen icon to select either the Pen or Highlighter option.

How do I highlight a line in a PDF on my phone?

To create a highlight, tap the center of your screen to bring up the Action Bar. Tap the Annotation Toolbar, then the Highlighter icon. Drag the marker with your finger to the end of a sentence or paragraph to highlight the text.

How do you underline a PDF on iPhone?

How to Underline Text in a PDF on iPhone Open the PDF document in Highlights. Tap the PDF you want to open in the Highlights document browser: ... Select the text you want to underline. This will bring up the selection popover: Tap the underline button in the selection popover.

Where is highlighter tool in PDF?

Choose Tools > Comment, and select the Highlight Text tool , the Strikethrough Text tool , or the Underline Text tool .

How do you insert a line in PDF?

Adding lines to a PDF document Choose Tools > Text Tool. Choose Notes > Line. Drag in the document until the line is located where you want, and drag the end points until it points where you want.

How do I underline text in a PDF on my phone?