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Hypothesis - Web & PDF Annotation icon

Hypothesis - Web & PDF Annotation

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Developer: Annotation Unlimited PBC
4.1200,000

Collaboratively annotate, highlight, and tag web pages and PDF documents.

Collaboratively annotate, highlight, and tag web pages and PDF documents.

User reviews

10 Β· from the Chrome Web Store
  • J

    Jakeukalane Milegum Firisse

    Mar 16, 2026

    It doesn't seem to be working anymore

  • A

    Anish Shrestha

    Feb 24, 2026

    Great extension. Does exactly what it needs to do. Minimalistic and replaces/merges a lot of extensions out there. There are occasional bugs which I bet are more prone due to growing SPAs, but still pretty usable.

  • A

    Anirudra Gc

    Aug 16, 2025

    Have not tried it on PDFs, but works great on Websites. No complaints here. Amazing extension, does what it claims to do.

  • A

    Ahmed Taboubi

    Aug 8, 2025
  • A

    Abby Graham

    May 23, 2024

    I really enjoy the this extension, it's very useful and easy to use. My only issue is it's a little buggy. Whenever I click into a different tab and return to the pdf, the pdf doesn't load but only on pages I've highlighted. Occasionally, the highlight/annotate buttons will stop appearing when I select a sentence. The only way to fix this, that I've found, is to fully close the pdf tab, and return to the original website that I accessed the pdf on, and load it up again. Ultimately, I really ...

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