How to Translate Substack From Thai to Spanish (Step-by-Step)

Thai-language content on Substack is rich and worth reading. If Spanish 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 Thai newsletter in place, directly into Spanish, with bilingual translation. The Thai stays visible and the Spanish 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 Thai paragraph on top and the translated Spanish 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 Thai-language newsletter open in a tab.

Step 1 — Open the Thai newsletter

Open the Thai piece you want to read.

Step 2 — Set Spanish as your target

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

Step 3 — Translate the page

Click Translate Now. BothLang places a Spanish translation directly beneath each Thai paragraph, leaving the Thai 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 Thai.

The short version

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

Try it on your next Thai-language newsletter.