Switch from Nitro to pdfFiller for a Add Electronic Signature PDF Solution Gratuito

Use pdfFiller instead of Nitro to fill out forms and edit PDF documents online. Get a comprehensive PDF toolkit at the most competitive price.
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.
0
Forms filled
0
Forms signed
0
Forms sent

Discover the simplicity of processing PDFs online

Card illustration
Upload your document in seconds
Card illustration
Fill out, edit, or eSign your PDF hassle-free
Card illustration
Download, export, or share your edited file instantly

Switch from Nitro to pdfFiller in 4 simple steps

1
Sign up for free using your email, Google, or Facebook account.
2
Upload a PDF from your device or cloud storage, check the online library for the form you need, or create a document from scratch.
3
Edit, annotate, redact, or eSign your PDF online in seconds.
4
Share your document, download it in your preferred format, or save it as a template.

Experience effortless PDF management with the best alternative to Nitro

Create and edit PDFs

Create and edit PDFs

Instantly customize your PDFs any way you want, or start fresh with a new document.
Fill out PDF forms

Fill out PDF forms

Stop spending hours doing forms by hand. Complete your tax reporting and other paperwork fast and error-free.
Build fillable documents

Build fillable documents

Add fillable fields to your PDFs and share your forms with ease to collect accurate data.
Save reusable templates

Save reusable templates

Reclaim working hours by generating new documents with reusable pre-made templates.
Get eSignatures done

Get eSignatures done

Forget about printing and mailing documents for signature. Sign your PDFs or request signatures in a few clicks.
Convert files

Convert files

Say goodbye to unreliable third-party file converters. Save your files in various formats right in pdfFiller.
Securely store documents

Securely store documents

Keep all your documents in one place without exposing your sensitive data.
Organize your PDFs

Organize your PDFs

Merge, split, and rearrange the pages of your PDFs in any order.

Customer trust proven by figures

pdfFiller is proud of its massive user base and is committed to delivering the greatest possible experience and value to each customer.
740K
active users
239
countries
75K
new subscribers per month
105K
user reviews on trusted platforms
420
fortune 500 companies
4.6/5
average user rating

Get started with
an all‑in‑one PDF software

Save up to 40 hours per month with paper-free processes
Make quick changes to your PDFs even while on the go
Streamline approvals, teamwork, and document sharing
Decoration
G2 Badge
G2 recognizes pdfFiller as one of the best tools to power your paperless office
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
Easiest To Do Business With - Summer 2025
Best Meets Requirements- Summer 2025
Best Support - Summer 2025
Easiest Setup- Summer 2025

Our user reviews speak for themselves

Read more or give pdfFiller a try to experience the benefits for yourself
5.0
This app is great. I can handle all of my business's contract signing operations and form generation with one tool! I would like to see more mobile app functionality.
Chad V
5.0
What do you like best?
i like tha twe can make changes wright in PDF and fax right away
What do you dislike?
I like everything about PDF is it most convenient to use
What problems are you solving with the product? What benefits have you realized?
faxing benefits
Administrator in Automotive

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 to add a signature block to a PDF Open the PDF with Adobe Acrobat. Select Tools at the top left of the screen. In the Forms & Signature sections, choose Prepare Form. Select Start. Choose the Add a Signature block icon from the tools ribbon. Move your cursor to where you want to place the block and click.
How to sign documents with an electronic signature. Click review and sign link in email. Click prompt in document. Create electronic signature. Select signature option. Sign document. Finalize signature. Send.
Click on the Signature Properties button to check signature properties. In the signature Properties window click Show Signers Certificate button. Following screen will be displayed once you click on it. Initially you will get the summary of the Digital Signature in the certificate viewer window.
Open the PDF document and select Sign from the top tools bar. Alternatively, from the All tools menu, select Fill & Sign. Create your signature and initials if not already done.
Follow the steps below to add a signature: Open your document in Adobe Acrobat. Click the Tools tab and scroll down to the Forms and Certificates section. Click on Digitally Sign from the new options bar. Select the digital signature you want to use and click Continue.
How to add a signature block to a PDF Open the PDF with Adobe Acrobat. Select Tools at the top left of the screen. In the Forms & Signature sections, choose Prepare Form. Select Start. Choose the Add a Signature block icon from the tools ribbon. Move your cursor to where you want to place the block and click.
How to request a signature from Nitro Pro Open the desired document in Nitro Pro, make any required updates, then select Request a Signature from the top ribbon's Home tab. The Nitro Sign panel will open on the right and your PDF will begin uploading to Nitro Sign.
Apply a stamp Open a document, and then from the All tools menu, select View more > Add a stamp. From the left panel, select Stamp and then select a desired stamp from a required category. At a desired position on the document, select to place the selected stamp.
Join 64+ million people using paperless workflows to drive productivity and cut costs