Skip to content
EN

Software · PDF: read, create, edit

sidemark

Sidemark is a lightweight PDF annotator for Linux with a live Markdown notes panel. Open a PDF draw directly on it, and write structured notes beside it.

  • Completely free
  • Linux
  • Open source
  • No account

Overview

Features described in its GitHub repository: annotation and highlighting, Markdown support.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Sidemark is a lightweight PDF annotator for Linux with a live Markdown notes panel.” — GitHub, 10 November 2026
  • “Sidemark is a lightweight PDF annotator for Linux with a live Markdown notes panel.” — GitHub, 10 November 2026

At a glance

All of sidemark is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

  • Open source code
  • No account needed
  • Commercial use allowed

Sources and checks

  • Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) —
  • Facts collected from LicitPro automatic classification () —
  • Last technical check: 7 November 2026
  • Description from github.com — Dépôt GitHub brokkoli71/sidemark (MIT)

How listings are built →

Do you develop sidemark?

Correct this listing with the report form, or cite it with this optional badge (it shows the verified free status and changes nothing in the ranking):

<a href="https://licitpro.fr/en/resource/sidemark"><img src="https://licitpro.fr/badge/sidemark.svg?l=en" alt="Listed on LicitPro" height="20"></a>

Developers and publishers →

In the same category

Okular

Software · Open source

Okular is a PDF reader, available on Windows, macOS and Linux: annotation and highlighting, Markdown support.

Completely freeWinMacLinux

Xournal++

Software · Open source

Take handwritten notes.

Completely freeWinMacLinux

Adobe Reader

Software

Adobe Reader is a PDF reader, available on Linux: annotation and highlighting. Old edition (2013).

Completely freeLinux

PDF4QT

Software · Open source

PDF4QT is a PDF editor, available on Windows and Linux: command-line use.

Completely freeWinLinux

Sioyek

Software · Open source

PDF viewer designed for reading research papers and technical books.

Completely freeWinLinux

PDF Toolkit

Mobile app · Open source

All-in-one PDF and image toolkit for Android.

Completely freeAndroid