There are a lot of free online PDF converters. But some of them are all free but some are partly free. If you want to find a totally free online tool. You can find them by guessing what kind of company would like to provide a free one all the time. Find the technology providers. They always present their free tools to attract a company customer. We can use them also. Let's take a PDF converter as an example.

1.Primary Conversion Service Providers: These companies usually allow users to convert a few pages for free or provide a limited free trial. Their ultimate goal is to convert free users into paying customers. This approach helps to build customer loyalty and can prompt users to purchase if they are in urgent need or require advanced features. Examples of such providers include:

• Free PDF Convert: https://www.freepdfconvert.com/
• Smallpdf: https://smallpdf.com/pdf-converter
• Online2PDF:https://online2pdf.com/

2.Companies Offering Other PDF Functions: These companies might collect some information from users and follow a similar model to the first type but aim to push users toward their other services or premium conversion functions. Examples of such businesses include:

• 17pdf: https://17pdf.com/converter/

• iLovePDF: https://www.ilovepdf.com/

3.PDF Technology Companies Targeting B2B Clients: These companies may offer all their functions freely on their websites to draw traffic, mainly aiming to allow their B2B clients to experience their services online, thereby reducing query time. This model benefits individual users (B2C) by providing unrestricted access to the tools they need for PDF processing. Commonly, these are PDF SDK providers, such as:

• Free online PDF conversion tool by ComPDFKit PDF SDK: ComPDFKit PDF Tools
• Free online PDF editing tool by ComPDFKit PDF SDK: ComPDFKit Web Viewer Demo
• Free online editing tool by PSPDFKit: PSPDFKit Demo

The third one is always free and good to use. Good luck!