Free open-source macOS app

MacPreview Studio

An open-source macOS Preview alternative for signing PDFs, underlining text, drawing, adding annotations, and marking up images.

Download DMG for macOS Star on GitHub

Current build: early prototype

Download the DMG, drag the app to Applications, and start testing. Because it is not Apple-notarized yet, macOS may ask you to confirm opening it.

PDF signing Draw signatures directly on PDF pages.

Underline mode Add clean underlines without fighting freehand drawing.

Image markup Paint, write, erase, rotate, and export.

Install in four steps

1Download the DMG.

2Open the downloaded file.

3Drag the app to Applications.

4Right-click and choose Open if macOS warns you.

Security note: this first release is ad-hoc signed but not Apple-notarized yet. If macOS blocks launch, right-click the app and choose Open, or allow it from System Settings → Privacy & Security.