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KeepFlash can now translate selected text in PDFs and notes

Select text in a PDF, captured page, or note and translate it while you read. Save a private translation on the original passage so you can return to it later.

September 19, 2026

KeepFlash can now translate selected text while you read. Highlight a passage in a PDF, a captured page, a supported X article, or a note, then get a translation without leaving the original.

This is a reading aid for your library, not a full-document translator. It works on the text you select. It does not export a translated PDF, rewrite the original note, or run as a browser-wide translator.

Translate a PDF or note while you read

Open a PDF, captured page, X article, or note and select the text you want to understand. KeepFlash translates that selection next to the original, so you can keep reading without switching tools.

Use it when a source mixes languages, when a PDF is written in a language you only partly know, or when a captured article has a sentence you want to check. The translation stays with the passage you highlighted.

Keep a private translation on the passage

If a translation is worth keeping, save it as a private mark on that passage. The original note stays unchanged. Saved translations belong to you, so they do not appear on other people's copies of the same source.

Come back later and the saved translation is still attached to the original text, rather than sitting in a separate document you have to search for.

Match the translation to the selection

A single word can include part of speech, pronunciation, and several meanings. A longer phrase or sentence gets a natural rendering that fits the surrounding passage.

Choose the target language before you translate. KeepFlash currently supports Chinese, English, Japanese, Korean, French, German, and Spanish.

Open your library and try it on a PDF or note you are already reading.

Put this update to work in your own KeepFlash library.

Open your library

What changed

  • Translate selected text in PDFs, captured pages, and notes
  • Save a private translation on the original passage
  • Get extra word context, or a natural rendering for longer selections

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