Accelerate the way you Underline PDF on Desktop For Free
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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.

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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.

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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.

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What our customers say about pdfFiller
See for yourself by reading reviews on the most popular resources:
Very user friendly site. I did lose my first document, since I didn't select the 'DONE' box first. Maybe just a little pop up message on how important that step is would be helpful.
2015-06-21
On first blush,this is a fine tool. I have a limited number of documents. So this works great. Simple. Easy to follow. Support answered some not so obvious questions quickly and easily. Well done. I have one question or suggestion..I would like to merge a couple of my documents...but don't want to pay for a full upgrade for just two or three uses. Can you offer a "yeah we'll let you do this" one off pricing for someone like me? Would be very helpful. (I will also say I tried several of the competing products...and this was far easier to use)
2017-04-20
It made filling out forms extremely easy and PDFfiller takes cakes care of faxing and emailing the documents. Well worth the price to avoid the stress!
2018-06-14
I am having trouble with the Schedule B when it gets half way down the page my screen jumps back to the top and I have a hard time making sure everything is on the right line
2018-11-08
What do you like best?
I like the choice of fonts because one can add changes or complete empty fields to a pdf and by using a different font from the original text it is clear that the additions are different from the original.. Also I like that one can add circles, check marks, "X" to a doc. And can erase portions of text.
What do you dislike?
I dislike that you have to pay extra to add or subtract pages from a pdf.
What problems are you solving with the product? What benefits have you realized?
My hand writing is very poor. So I use PDFiller to compensate for this deficiency..
I like the choice of fonts because one can add changes or complete empty fields to a pdf and by using a different font from the original text it is clear that the additions are different from the original.. Also I like that one can add circles, check marks, "X" to a doc. And can erase portions of text.
What do you dislike?
I dislike that you have to pay extra to add or subtract pages from a pdf.
What problems are you solving with the product? What benefits have you realized?
My hand writing is very poor. So I use PDFiller to compensate for this deficiency..
2019-05-21
I have had a great experience thus far…
I have had a great experience thus far in my free trial. I have been able to merge documents to create a continuous flow, create signature stamps and fill out fillable pdfs' for my work. This is a great product!
2024-10-30
Prompt and honest.
They answered my query online immediately and refunded for an incorrectly charged (not their fault) subscription fee within the hour! Was not expecting such prompt service and honesty to be fair, but so grateful they are honourable.
2020-09-06
Best part of the service is responsiveness to online support, but there are a few minor glitches that should be addressed. I'll elaborate later when time allows for it.
2025-04-30
Completed what I needed done
Completed what I needed done. The reason for 4 stars is because you force people to sign up for a monthly subscription versus just charging for the one time use of the feature.
2025-03-03
Accelerate the Way You Underline PDF on Desktop
Enhance your PDF experience with the streamlined underlining feature. This tool allows you to highlight essential information quickly and efficiently, making your document review process seamless and organized.
Key Features
Intuitive interface for easy navigation
Single-click highlighting for rapid underlining
Customizable underline styles to suit your preference
Compatible with various file formats
Quick access to recently edited documents
Potential Use Cases and Benefits
Perfect for students who need to mark important text in study materials
Ideal for professionals reviewing contracts or reports
Helpful for researchers organizing reference materials
Useful for editors providing feedback on articles or manuscripts
This feature addresses the challenge of efficiently identifying key points in lengthy documents. By enabling you to underline vital information swiftly, you save time and enhance your productivity. Whether you are studying, working, or editing, this tool elevates your PDF handling to meet your needs.
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 you highlight a PDF on a PC?
0:56 2:43 How to Highlight Text in a PDF on Windows - YouTube YouTube Start of suggested clip End of suggested clip I'll navigate to the comment tab on the ribbon which contains my annotation tools I'll selectMoreI'll navigate to the comment tab on the ribbon which contains my annotation tools I'll select highlight then use my cursor to drag it over the text be aware that this feature will only work on PDF
How do I underline text in a PDF?
Highlight, strikethrough, or underline text Choose Tools > Comment, and select the Highlight Text tool , the Strikethrough Text tool , or the Underline Text tool . Note: ... Drag from the beginning of the text you want to mark up. ... (Optional) To add a note, double-click the markup and add text in a pop-up note.
How do you highlight an entire PDF?
Click somewhere in the document, then press Ctrl + A (Windows) or ⌘ Command + A (Mac) to select all text in the document.
What is the shortcut for underline in PDF?
How to Underline Text in PDFs? Click Tools. on the toolbar -> hit Underline -> choose the words or sentences you want to emphasis; Or choose the text at first -> click Tools on the toolbar -> hit Underline; Or press shortcut Ctrl + Alt + U -> then select the text you want to underline.
How do you highlight on a PC?
To highlight with the keyboard, move to the starting location using the arrow keys. Then, hold down the Shift key, and press the arrow key in the direction you want to highlight. Once everything you want is highlighted, let go of the Shift key.
Video instructions on how to Underline PDF on Desktop
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