v0.5.5 is hereMeet TextPack

WINDOWS & ANDROID · FREE & OPEN SOURCE

TumblingCat · Markdown reader & editorLight. Clean.
Easy on the eyes.

A lightweight, open-source Markdown reader and editor with comfortable typography.
Supports .md and image-packed .textpack files. Your words and pictures travel together.

Download for WindowsView source
6.35 MiB · No installation·Also on Android
Actual app screenshotWindows · Soft green theme · WYSIWYG editor
Actual screenshot of TumblingCat md for Windows, with its Chinese interface: a WYSIWYG editor in the soft green theme, file and formatting toolbars above a heading and a list of app features.
Editing tools within reach. More room for your words.View full-size image

01 / LESS, BUT BETTER

Everything you need.
Nothing weighing you down.

Room for your words.
Freedom to make it yours.

LIGHTWEIGHT

Lightweight from the first click.

One Windows EXE, ready to run. TumblingCat uses your system’s WebView2 runtime to keep the app itself small.

6.35MiBWindows portable EXE
v0.5.5 app size
OPEN & LOCAL

Open code. A clean experience.

Source code you can inspect, under Apache-2.0. No account required, no editor usage analytics. Your documents are read and saved locally.

No accountLocal filesOpen source
MARKDOWN + TEXTPACK

Your words and images, together.

Work with familiar .md files, or bundle Markdown and local images into one .textpack. Illustrated notes are easier to move and share.

Meet single-file illustrated notes
MADE FOR READING

A comfortable rhythm for your words.

Switch between WYSIWYG, source, and reading views. Adjust type size, line spacing, and page width. Choose black, white, or a soft green theme.

AaType sizeSpacingWidth

Your documents do not need to be uploaded. Remote images and web pastes may connect to the relevant image servers.

02 / ONE FILE. ALL TOGETHER.

One document.
Everything in its place.

Screenshots, reference images, and words.
All packed neatly into one file.

Create a TextPack or save an existing Markdown document as one. Embedded images travel with the file, making it easy to move between your computer and phone.

.md+.textpack

Conversion bundles accessible local images. Existing remote images keep their original URLs.

Download a TextPack sample
My ideas.textpackONE FILE
├─text.mdMarkdown content
├─info.jsonDocument metadata
└─assets/Original image files
├─inspiration.png
└─reference.jpg
Images inside. No separate attachment folder to carry.

03 / READY WHEN YOU ARE

Your next page starts here.

A lighter way to read and write.

What’s new

Android

Android 7.0+ · ARM64

v0.5.5

Take your reading and ideas with you.

Download for Android
10.64 MiB · ARM64 package.apk
Download source:GitHub
SHA-256 checksums

Uses the system file picker. No broad storage access needed.

Windows and Android are both available as v0.5.5 from GitHub.

READ. WRITE. TAKE IT WITH YOU.

Markdown guides

How to share Markdown with its images in one file

A Markdown note can lose its pictures when you copy only the .md file. TumblingCat can bundle Markdown and accessible local images into a single TextPack document.

Open, edit, and read Markdown on Windows

TumblingCat is a free, open-source Markdown reader and editor with a portable Windows EXE. Switch between formatted editing, source, and reading views without creating an account.

Read Markdown and illustrated notes on Android

TumblingCat for Android opens local Markdown and TextPack notes with embedded images. The current APK supports ARM64 devices running Android 7.0 or later.

What is a TextPack file, and how do you open it?

TextPack stores Markdown and local images in one file. Open .textpack or .md.textpack documents in TumblingCat, or use a ZIP utility to extract the text and attachments.

Markdown images not showing? Check paths, permissions, and URLs

Opening the Markdown text does not guarantee that an app can access its images. First identify local files versus remote URLs, then check paths, permissions, and formats.

Export Markdown to PNG images or copy a selected passage

TumblingCat can export a complete Markdown document to PNG images or copy selected text as an image. Long documents are split into numbered pages, so you do not have to capture each screen manually.

Browse all guides

A few things before you begin

What is the difference between Markdown and TextPack?

A regular .md file contains Markdown text; local images usually live in a folder beside it. A .textpack stores the text and images in one ZIP container. A name such as notes.md.textpack works too—the extension is still .textpack. Other editors need TextPack support to open it directly. You can also unzip it to access the text and attachments.

Do I need an account or an internet connection?

No account is needed. Documents are read, edited, and saved on your device. TextPack documents with embedded images also work offline. Displaying or exporting remote images and pasting web content requires access to the corresponding image URLs.

Can I read long documents and large files?

Yes. Chapter outlines, reading preferences, and position restoration help you keep your place. Documents of 2.5 MiB or more open with viewport rendering, reducing the work of laying out the entire document at once. This lightweight preview may display complex formatting differently from regular documents.

Are my changes saved automatically?

You save the original document manually. Unsaved changes are kept in local recovery drafts, with up to five drafts retained. TextPack drafts include embedded images. Recovery drafts offer limited recovery; save and back up important work regularly.