PDF Raven

What it does

PDF Raven is a modern online PDF editor that works entirely in your browser. Without signing in, you can instantly annotate PDFs by adding text, highlights, comments, drawings, and shapes—no downloads or watermarks. Sign in to unlock PDF Raven's full potential with true PDF editing, permanent redaction (not just black boxes), and Studio—a powerful workspace that lets you edit, organize, and transform PDFs effortlessly with a smooth, hassle-free experience. Works seamlessly on desktop and mobile.

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  CanaryPDFSep 2025 · ▲114

  Extract tables and edit PDF files right in your browser

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  PDF Expert for Mac2015 · ▲187

  The best PDF viewer, editor, and form filler available.

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  Full-featured PDF editor for Mac, with OCR and Word export.

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  PDFgear2022 · ▲110

  The free pdf solution for all

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  PDF Annotator by Good Annotations2020 · ▲105

  Draw on your pdf online

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  Editaê PDF25d ago · editaepdf.lovable.app · ▲3

  Edit, merge, and sign PDFs directly in your browser.

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  Open-Source eInk Bike Computer▲385

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• TL
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  Let agents source clips from terabytes of your local video

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• SA
  Simple algorithm and color space to generate diverse skin tones▲627

  Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…

  Life & fun · Aug 2026 · toneyalexander.github.io

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  AdAnt AI▲608

  Claude for viral, high-converting social ads

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  I trained a 125M model to autocomplete piano on-device▲598

  I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.

  AI · 16d ago · simedw.com