We are a small team of developers and readers who got frustrated with the state of online file conversion — so we built something better. Here is our story, our philosophy, and where we are headed next.
In late 2024, one of our team members was preparing for a professional certification exam. He had purchased several textbooks in EPUB format from an online publisher and needed to convert them to PDF so he could print specific chapters and annotate them with a pen — old school, but effective for retention.
He tried the first converter that appeared in a Google search. It asked him to upload his textbook to a server in another country. He hesitated but went ahead. The conversion took nearly a minute, and the result was a PDF with mangled formatting and a watermark across every page unless he paid $9.99 for "premium." He tried a second tool. This one required creating an account and verifying his email before he could download the output. A third tool worked but was so slow that it felt like the server was handling hundreds of requests ahead of his.
When he mentioned the experience to the rest of the team at Affor Technologies, it sparked a conversation that none of us could let go of. We are a team that builds web applications for a living. We know what modern browsers can do. And we knew, instinctively, that converting an ebook file does not actually require a server. Browsers can read files from your device. They can decompress ZIP archives. They can generate PDFs. They can do all of this in a sandboxed environment that is as secure as online banking.
So we asked ourselves a simple question: what if we built a converter where the file never left the user's device?
We spent the next several weeks building the first version. We parsed hundreds of EPUB files to test edge cases — books with complex chapter structures, novels with dozens of embedded images, textbooks with tables and footnotes. We tuned the MOBI parser to handle the quirks of Amazon's legacy format. We tested on Chrome, Firefox, Safari, and Edge, on laptops, tablets, and phones. When we were satisfied that the output quality was genuinely good, we launched CheersPDF as a free tool.
That was early 2025. Since then, CheersPDF has grown into a suite of four tools: EPUB to PDF, MOBI to PDF, PDF to EPUB, and PDF Image Extraction. Every one of them runs entirely in the browser. Every one of them is free. And every one of them reflects the same core belief that started it all: converting a file should not require trusting a stranger with your documents.
These are the principles we actually build around — not marketing slogans, but engineering decisions we make every day.
Most tools promise privacy through policy. We deliver it through architecture. CheersPDF has no server-side file processing component — there is literally no infrastructure that could receive your files, even if someone wanted it to. Your privacy is not a feature we toggle on or off; it is baked into the foundation of how the software works. We think this distinction matters enormously.
We resist the temptation to add features just because we can. Every tool on CheersPDF does one thing well. EPUB to PDF converts EPUB to PDF. MOBI to PDF converts MOBI to PDF. There are no confusing menus with 47 options. We believe that most people just want to select a file and get a result, and we design around that expectation. Advanced settings exist for users who want them, but they are never required.
When we say CheersPDF is free, we mean it without qualifiers. There are no premium tiers hiding the good features behind a paywall. There are no daily conversion limits. There are no watermarks on your output files. Every feature is available to every user, always. The site is supported by advertising, which means you help keep CheersPDF free simply by visiting — and we are grateful for that.
We believe in telling you exactly what happens when you use our tools. Our Privacy Policy is written in plain language. Our FAQ answers are honest about limitations. If a scanned PDF will not convert well, we tell you upfront instead of giving you a broken output and hoping you do not notice. We would rather lose a conversion than lose your trust.
File conversion should not require technical expertise, expensive software, or a fast internet connection. We design CheersPDF to work for everyone: students converting textbooks in a library, grandparents sharing family documents, professionals preparing reports on a commuter train. If you can use a web browser, you can use CheersPDF.
CheersPDF is not a "set it and forget it" project. We actively improve conversion quality, fix edge cases, and add support for new formats and features. We are currently working on AZW3 support, batch conversion improvements, and better handling of complex PDF layouts with tables and multi-column text. When we ship updates, they benefit every user immediately — no download, no update prompt, just better results the next time you visit.
A look under the hood for the curious. If you are not interested in the technical details, feel free to skip ahead — you do not need to understand any of this to use CheersPDF.
CheersPDF is built entirely with standard web technologies — no browser plugins, no extensions, no native code. Here is what happens when you convert a file:
Decompressing a large EPUB or parsing a complex MOBI file can take a few seconds of intensive computation. If we ran that work on the browser's main thread, the page would freeze and become unresponsive. Instead, we use Web Workers — dedicated background threads that process data independently of the main thread. This is the same technology that lets applications like Google Sheets perform complex calculations without freezing the interface. The result is a converter that stays responsive even while processing large files.
We believe in building on the shoulders of proven, open-source software. The core libraries CheersPDF depends on — jsPDF, JSZip, and pdf.js — are used by thousands of projects, reviewed by the open-source community, and maintained by dedicated teams. By using these libraries instead of writing everything from scratch, we benefit from years of testing, optimization, and security review that we could not replicate on our own.
Affor Technologies is a technology company focused on building practical, privacy-respecting tools for everyday use. We believe that the best software solves real problems without creating new ones — like privacy concerns, subscription fatigue, or installation headaches.
CheersPDF is our flagship product, but it represents a broader philosophy: that browser-based tools can be just as powerful as desktop applications while being more accessible, more private, and more convenient. The browser has evolved from a simple document viewer into a full application platform, and we think that potential is still vastly underused for everyday utilities.
We are a small, focused team. We do not have a large marketing department or venture capital funding demanding growth at all costs. We build tools we actually use, and we share them openly because we believe the internet is better when good tools are free and accessible. Our revenue comes from advertising on the site, which keeps CheersPDF sustainable without requiring us to charge users or compromise on features.
If you are curious about how we approach content quality and accuracy, read our Editorial Standards. If you want to know exactly what data we do and do not collect, read our Privacy Policy, written in plain language.
CheersPDF is under active development. Here is a look at what is on our roadmap.
We do not have fixed release dates — we ship updates when they are ready and tested. If you have a feature request or notice a bug, we genuinely want to hear about it.
We would love to hear from you — whether it is feedback, a bug report, a feature request, or just a note to say hello.
Email us at: contact@affortechnologies.com
Learn how we create and review content: Read our Editorial Standards