How to Build a React.js PDF Viewer with PSPDFKit 

for free obviously

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Absolutely! Here's an example: codesandbox.io/s/cranky-andras-57gx4s?file=/index.js

Please ensure you're loading a PDF from your public folder. If this doesn't work, please make sure you have all the necessary dependencies and follow every step as indicated in our Getting-Started Guide here: pspdfkit.com/getting-started/web/?frontend=react&download=npm&integration=module&project=new-project

Does the PDF URL have the same domain origin as your server ? If not, the browser (client) won't allow you fetching the PDF document. I'd recommend building a backend with node.js to request the PDF file, convert it to a buffer or blob, and then pass it to your front-end to load it as the document in PSPDFKit. Here's a guide that shows how to convert a URL to an Array Buffer: pspdfkit.com/guides/web/open-a-document/from-remote-url/ Alternatively, you could also use a proxy to work around the CORS error. This independent RU-vid tutorial explains in short why CORS issue happens and options to fix them: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gPzMRoPDrFk.html&ab_channel=SoftAuthor Please feel free to reach out to support@pspdfkit.com if you have any further questions or concerns, and we'd happily help.

Trial Mode is free but you'll always see a red watermak. It's removed once you purchase a license. If you want it for personal use, I'd recommend downloading our Apps or using our online demos. Apps: pdfviewer.io/ Demos: pspdfkit.com/demo/hello

Will there app for winOS released? If this would never be the plan, could I get the trial version for private use? The UI of PSPDFKit is so beautiful and clean.