Vertical writing for Google Docs™

TateGaki is a free Google Docs add-on that brings Japanese vertical writing (tategaki) to Google Docs. Manuscript paper (400/200-character grids), ruby (furigana), and proper line-breaking rules — all inside a clean editor dialog.

Get it on Google Workspace Marketplace

Free during current release

TateGaki demo — vertical writing in Google Docs

TateGaki demo — vertical writing in Google Docs

400-character genkō yōshi (manuscript paper) main view

400-character genkō yōshi — main view

200-character genkō yōshi (manuscript paper)

200-character genkō yōshi

Ruby (furigana) input modal

Ruby (furigana) input modal

Export to Google Docs as a grid table

Export to Google Docs as a grid table

Google Drive file picker modal

Google Drive file picker

Who it's for

📝 For novelists and dōjin writers

Write in 400/200-character genkō yōshi with proper vertical layout. Ruby and kinsoku shori included.

🏫 For Japanese language teachers (worksheets, manuscript paper)

Quickly produce essay sheets and kanji practice paper, ready to print.

📄 For formal Japanese documents (greetings, certificates)

No Word required — make beautiful vertical Japanese documents in your browser.

🌏 For Japanese speakers abroad who need vertical-writing documents

Nothing to install locally. Use it from any browser, anywhere in the world.

Features

Manuscript paper modes

400-character (20×20) and 200-character (10×20) genkō yōshi layouts, with proper orange grid styling.

Vertical editor

Type vertically right inside the dialog. Full IME support for comfortable Japanese input.

Ruby (furigana)

Add ruby annotations alongside each column in manuscript paper mode.

Line-breaking rules

Proper kinsoku shori — punctuation and closing brackets never start a line.

Export to Google Docs table

Write the editor's content out to your Google Doc as a grid table (one cell per character).

Google Drive save

Save and load documents from your Drive, with overwrite support for in-progress work.

Read the dev story

🔧 Qiita (Japanese)

Building a Google Docs vertical-writing add-on with Claude — from no coding background to Marketplace launch

Technical write-up covering Apps Script, the Marketplace review, and the Claude-driven workflow that got it shipped. Original article in Japanese.

▶ Read

Install free now

One click to install from the Google Workspace Marketplace.

▶ Install free

Free during current release

FAQ

Q. Can Google Docs do vertical writing?

A. Not out of the box. Once you install TateGaki, you get vertical writing and manuscript paper layouts inside a dialog in Google Docs.

Q. Does it support 400-character manuscript paper?

A. Yes — both 400-character (20×20) and 200-character (10×20) genkō yōshi layouts are supported.

Q. Can I add ruby (furigana)?

A. Yes. In manuscript paper mode, each column has a ruby field on its right side.

Q. Does it apply Japanese line-breaking rules (kinsoku shori)?

A. Yes — both line-start and line-end kinsoku rules are applied automatically.

Q. Is TateGaki free?

A. Yes. TateGaki is free to install from the Google Workspace Marketplace.

For more questions, see the support page.

How we handle your data

TateGaki complies with the Google API Services User Data Policy, including the Limited Use requirements.

This add-on requests only the minimum permissions needed to write tables to Google Docs™ and save files to Google Drive™. No user data is sent to any external server.

See the Privacy Policy (Japanese) for details.