How to Translate Substack From Japanese to Korean (Step-by-Step)

Japanese-language content on Substack is rich and worth reading. If Korean is your stronger reading language, the usual friction applies: copy the text into a translator and lose the layout, or read slower than you would like.

This guide shows a third option — translate the Japanese newsletter in place, directly into Korean, with bilingual translation. The Japanese stays visible and the Korean meaning appears right beside it, so you can read the meaning quickly and still check the original for any word, name, or phrase.

Demo note: the screenshots below are built in a real Substack layout to show exactly how BothLang displays a bilingual page — the Japanese paragraph on top and the translated Korean directly beneath, with a hand-drawn arrow pointing at the translation.The workflow is identical on any newsletter because BothLang works on whatever page you are viewing.

What you need

• BothLang installed in Chrome, Edge, or Firefox — see the download page.
• The extension pinned to your toolbar.
• A Japanese-language newsletter open in a tab.

Step 1 — Open the Japanese newsletter

Open the Japanese piece you want to read.

Step 2 — Set Korean as your target

Click the BothLang icon. Set Translate into to Korean and Page display to Bilingual.

Step 3 — Translate the page

Click Translate Now. BothLang places a Korean translation directly beneath each Japanese paragraph, leaving the Japanese intact. A hand-drawn arrow marks the first translated paragraph.

Step 4 — Switch reading modes

• Bilingual — source and translation together.
• Translation only — fastest.
• Original only — back to clean Japanese.

The short version

1. Install and pin BothLang.
2. Open a Japanese newsletter.
3. Set Translate into: Korean, Page display: Bilingual.
4. Click Translate Now.
5. Read the Korean with the Japanese original underneath.

Try it on your next Japanese-language newsletter.