Bibme.org was acquired by Chegg and turned into a spammy money grab. Seven ads on one page, and most of the ads are dynamic video ads! The website is unusable now. Rest in peace bibme.org. I relied on you all throughout high school and my undergrad. Source: almost 3 years ago

I have seen papers on turnitin get into the low 30s from quotations plus an extensive bibliography. If you are using commonly cited books and a bibliography writing website such as bibme.org or citationmachine.net then this bumps the score up. Also, if you have previously put the draft of the same paper through turnitin, this may also be a reason for high scores. Source: about 3 years ago

If you don't mind an Electron or web-based app with a subscription, you could also look at Zenreader [0], Polar [1] or maybe even Readwise [2]. Zotero will also have a PDF Reader app with Markdown export soon [3]. And some cross-platform note taking / PKM apps also have some kind of PDF annotation support (directly: Logseq [4]; via plugins: Obsidian [5], Roam Research [6]). That said, all these apps are very... - Source: Hacker News / over 2 years ago

I bumped into https://zenreader.co.uk ages ago but never tried it. Source: almost 3 years ago