plainmark.

Markdown, with room to think.

A little space
for your words.

A free, open-source Markdown viewer and editor for Windows, macOS, and Linux. Open a file. Find your focus. Make something worth keeping.

Get Plainmark Explore the source

No accounts. No ads. No tracking. Always free.

Plainmark in split view: Markdown on the left, a live reading preview on the right, and a document outline in the sidebar.
Write. Split. Read. One document, however you like to see it.

Your files stay yours.

Work with ordinary Markdown files on your own device. No upload, account, or cloud connection needed to write.

Just enough to write well.

Live preview, find and replace, a document outline, formatting shortcuts, and a focus mode. Light or dark, your choice.

Open from the start.

Read the code, make a change, or share it with someone. Official releases are free, with no subscriptions or locked features.

Make yourself at home

A small place to begin.

v0.1.0 · Early preview
A note about this preview.

The Windows and Mac installers are not yet publisher-signed or notarized, so your computer may show a security prompt. Linux compatibility depends on your distribution. Read the installation notes or build from source.

Made for your words,
not your attention.

Plainmark is a small, independent open-source project. No bundled offers, telemetry, premium tiers, or ads. That is the commitment for official Plainmark releases.

Read our principles