Switch from SmallPDF to pdfFiller for a Add Formula Field Button to Document for Sign Solution For Free

Use pdfFiller instead of SmallPDF to fill out forms and edit PDF documents online. Get a comprehensive PDF toolkit at the most competitive price.
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Switch from SmallPDF 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 SmallPDF

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.

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4.6/5
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Save up to 40 hours per month with paper-free processes
Make quick changes to your PDFs even while on the go
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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
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Our user reviews speak for themselves

Read more or give pdfFiller a try to experience the benefits for yourself
4.0
PDFfiller is a very helpful tool. However, I do feel there are aspects that could be improved. For example, it would be useful to be able to fill in ovals.
Werner H
5.0
What do you like best?
The interface of PDFfiller is simple and intuitive. I think that most people can sign up and start using PDFfiller without having to spend much time figuring things out. Once we load a PDF into the system, there are straightforward menu items and labels that help to fill out virtually any form from start to finish. I can save to PDF format with my filled-in information or print right from the PDFfiller website.
What do you dislike?
Anytime I post my information online, I get apprehensive about how my data is being used. Though I'm sure PDFfiller probably takes measures to keep our uploaded and saved documents secure, I just never know with all the malware and server attacks that often occur, in general.
Recommendations to others considering the product:
Some people probably don't want to hassle with putting their documents through a digitized system, but I think once you upload one form to PDFfiller, you'll see how intuitive the entire process and may possibly not print out documents to fill them out anymore.
What problems are you solving with the product? What benefits have you realized?
My handwriting is basically terrible and I often get strains when writing since I typically haven't written by hand much over the past several years. PDFfiller lets me fill out PDF documents more effortlessly and lets me align text and other objects with great precision.
Thomas Ayukawa

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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
If you are not in form editing mode, choose Tools > Prepare Form. Using the Button tool, drag across the area where you want the button to appear. In the Options tab, choose an option in the Layout menu for the button label, icon image, or both.
A: PDF Studio 9 and above is capable of creating PDF forms with custom calculations. You have the ability to use some preset simple calculations or advanced custom calculations using Java. Select the Text Field that you would like to perform the calculation and open up the Text Field Properties.
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