Easily Merge and Replace PDF online For Free

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Up to 100 MB for PDF and up to 25 MB for DOC, DOCX, RTF, PPT, PPTX, JPEG, PNG, JFIF, XLS, XLSX or TXT
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Discover the simplicity of processing PDFs online

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Upload your document in seconds
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Fill out, edit, or eSign your PDF hassle-free
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Download, export, or share your edited file instantly
Top-rated PDF software recognized for its ease of use, powerful features, and impeccable support
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025

Every PDF tool you need to get documents
done paper-free

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Create & edit PDFs

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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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.
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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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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.
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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.
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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.

Customer trust by the numbers

64M+
users worldwide
4.6/5
average user rating
4M
PDFs edited per month
9 min
average to create and edit a PDF
Join 64+ million people using paperless workflows to drive productivity and cut costs

Why choose our PDF solution?

Cloud-native PDF editor

Access powerful PDF tools, as well as your documents and templates, from anywhere. No installation needed.

Top-rated for ease of use

Create, edit, and fill out PDF documents faster with an intuitive UI that only takes minutes to master.

Industry-leading customer service

Enjoy peace of mind with an award-winning customer support team always within reach.

What our customers say about pdfFiller

See for yourself by reading reviews on the most popular resources:
I needed fast, no nonsense access to CMS approved forms, HCFA1500 to be specific. This was fast, easy to use, and I can save my files to my pc. I can edit, print, e mail, fax, its great! I love it! I had questions on how to use certain edit features, I couldn't figure out, as I am not a computer "savy" person, I just get on, know what I have to do, and need it to work. The support team responded immediately to my questions and I knew I had 24-7 access to them which is important to me as I often work late at night. That is actually priceless. Great product at a great price w awesome customer support
Michele
2016-09-05
It's very good and I recommend it to others. I know I am not getting the full benefit, and should attend a webinar but feel too busy unless it could be archived and watched at my convenience.
Laurel S
2018-03-07
I filled in IRS 990, Schedules A & O but didn't know I was using PDFfiller and when I tried to print I found I was locked out, so I had to subscribe and still have filled our forms that are locked out. Need timely hep in unlocking these documents. Since this experience and subscribing to PDFfiller (annual Suscrition) I have found it works very well. I contract for a Jazz club's 5 venues sites and have to fill out two cities' forms that I found easy to get using PDFfiller. I also became the treasurer of the Jazz Club again and had to bring out IRS 990s up to dat--non-profit. Again fond using PDFfiller to get fillable forms easy, better than going to IRI.gov.
Hugh R
2018-12-09
I'm doing my own real estate contract and pdffiller has made this experience less stressful and actually kind of fun! I'll definitely be using this service a lot.
susan r
2019-09-10
The format of the website was a lot to get used to as there are a plethora of options to go through. Once I was familiar with the site it became obvious this was everything I needed it to be. Great functionality, easy to use. Highly recommend.
Justin S
2020-02-07
Had a moment of learning like how to… Had a moment of learning like how to rotate document but have been overall very satisfied for what I wanted to do.
jehovah0123
2019-04-06
Easy to use My company provides PDF forms that need to be edited and PDF filler allows me to do that The software was easy to download and use. It's does everything I need and more. I don't dislike anything about this product.
Verified Reviewer
2019-01-21
Awesome software! Very easy to use and great to help fill PDF's and create them. I use this software very often and I rarely have issues. Sometimes it lags and it can be a pain, but overall this is a great software to use and I don't have many cons.
Travi Y.
2018-03-27
Needed something to fill out a form in… Needed something to fill out a form in a hurry - it did recognise the fields, that's a plus compared with some others, LOL. Wasn't looking for any fancy features like faxing, but did the job. May only cancel IF I don't use it that much.
Stu Mountjoy
2020-04-21

Tips on how to Merge and Replace PDF online

If your everyday workflow involves editing or processing numerous PDF files, the range of your editor’s functionality determines your efficiency and capacity throughout the working day. If you are using the appropriate software for your day-to-day jobs, to Merge and Replace PDF must be a fast and straightforward process. Try out pdfFiller to access any document feature in seconds and focus on the value of your projects.

With this robust online editor, you can access your document history from any device and make all the changes you need at any time. The intelligible toolbar provides each functionality within a click, so you do not have to spend a lot of time onboarding or getting additional training. Create, edit, share, add fillable fields, and collaborate on your documents efficiently.

Check how easy it is to Merge and Replace PDF with pdfFiller

01
Go to the pdfFiller website and log in to your account. If you are a new user, you can register a new profile in a few clicks.
02
Go on to the Dashboard and import your file by clicking + Add new. Utilize the handiest method to add it: upload, find a template, link it from the storage space, or just insert the URL.
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Now you are set to Merge and Replace PDF.
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If required, introduce any additional modifications to your document using the comprehensive toolbar: add content, place fillable fields, annotate, highlight, or insert media.
05
Invite other users to collaborate on the file in real time.
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As soon as done, click DONE to complete editing.
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Upload the document to your account or access it in your document history.

Merge and Replace PDF with pdfFiller and get sophisticated functionalities to lift up your document processing experience. Work on your documents without obstacles on your way to greater efficiency, whether it is an individual task or a collaborative project. Start your free trial and try it now!

Easily Merge and Replace PDF Feature

With our Easily Merge and Replace PDF feature, you can take control of your documents like never before. Whether you need to combine several PDFs into one, or simply replace pages within a file, this tool streamlines your workflow, saves you time, and enhances your productivity.

Key Features

Merge multiple PDF files effortlessly
Replace specific pages within existing PDFs
Intuitive and user-friendly interface
Fast processing for large documents
Keep original formatting intact

Benefits and Use Cases

Create comprehensive reports by merging different files into a single PDF
Update documents quickly by replacing outdated information
Organize important files for presentations or meetings
Streamline paperwork for legal and business transactions
Simplify document sharing with clients and colleagues

This feature solves your document management problems by offering a straightforward solution with just a few clicks. You no longer need to waste time navigating complex software or dealing with cumbersome formatting issues. Instead, you have the tools at your fingertips to efficiently handle your PDF documents, making your tasks simpler and more effective.

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!

Video guide about Merge And Replace PDF

#1 usability according to G2

Try the PDF solution that respects your time.
Users Most Likely To Recommend - Summer 2025
Grid Leader in Small-Business - Summer 2025
High Performer - Summer 2025
Regional Leader - Summer 2025
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025