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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 · 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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