Slides Translator vs Slide Buddy (2026): Which Free Google Slides Translator Actually Wins?

What These Two Tools Are

Slides Translator is a Google Workspace add-on that translates selected text or slides using the Google Translate API. It exposes a sidebar with a source/target language picker and a "Translate" button — familiar to anyone who has used Google Translate in a browser.

Slide Buddy is a Google Workspace add-on that translates entire decks using Google Gemini Flash. Instead of a dropdown, it accepts natural-language commands like "Translate the whole deck to Spanish" or "Translate slides 3–8 to formal Japanese", and it processes slides plus speaker notes in a single pass.

Both are listed in the Google Workspace Marketplace and install in under a minute.

Feature Matrix

Speed: Where the Gap Shows Up

For a single slide, both tools feel instant — under ten seconds. The gap opens when you ask for a full deck. Slides Translator handles slides one at a time, with each call going to Google Translate and back. On a 10-slide deck that means 10 sequential round-trips, plus UI re-renders. In our test that came out to roughly 25–40 seconds depending on slide density.

Slide Buddy sends the whole deck to Gemini Flash in a single batched request. Gemini returns translations for every text frame at once, and Slide Buddy writes them back in parallel. The same 10-slide deck finishes in about 7 seconds, regardless of whether you also asked it to translate speaker notes.

For a 50-slide training deck or a multilingual rollout where you're producing the same deck in five languages, that 4–6× speed difference compounds quickly.

Languages and Quality

Both tools cover the ~100 languages most users need, including Spanish, French, German, Portuguese, Chinese (Simplified and Traditional), Japanese, Korean, Arabic, Hebrew, Hindi, Vietnamese, Thai, and Turkish. The difference shows up in how they translate.

Slides Translator uses neural machine translation tuned for short strings — fast, literal, and predictable. Slide Buddy uses an LLM, which means it can take context across the whole slide into account and respect requested tone (e.g., "translate to formal Japanese for an enterprise audience"). For technical or domain-specific decks, the LLM approach tends to produce fewer awkward literal renderings.

For right-to-left languages, Slide Buddy preserves the original text-frame geometry rather than rebuilding it, which avoids the layout drift that sometimes shows up in Arabic and Hebrew translations.

Pricing

Slides Translator ships a free tier with a daily character or slide quota and paid plans for heavier use. If you translate decks occasionally, the free tier is usually enough. If you translate daily or work with long decks, you'll hit the quota.

Slide Buddy is fully free with no quota, no paywall, and no sign-up. There is no premium tier today. For users who simply need to translate decks reliably without managing a billing relationship, that matters.

Which Should You Pick?

Pick Slides Translator if: you only translate a handful of slides at a time, you prefer a familiar Google-Translate-style dropdown, and you don't need speaker-notes translation.

Pick Slide Buddy if: you translate full decks, you need speaker notes translated alongside slide text, you want tone control, you work with RTL languages, or you simply don't want to manage a free-tier quota. Most teachers and knowledge workers fall into this bucket.

FAQ