AI Translation in KDAN PDF helps you understand foreign-language content while you read.

You can translate only the selected text, or translate the entire file without leaving the PDF viewer 

In KDAN PDF for Windows v2.5.0 and later, AI Translation has been updated with improved translation quality and a refreshed experience.

If you’re using an earlier version, please update to access the upgraded AI Translation.

What’s improved in v2.5.0

• Updated the existing AI Translation with the GPT 4.1 model for better results
• Access AI Translation faster from the AI quick menu
• Free monthly AI Translation allowance for signed-in users

Who can use AI Translation

AI Translation is available in KDAN PDF for Windows Lite.

• You must sign in with a KDAN ID
• AI features are not available when you are not signed in

This update helps us deliver higher translation quality and support more languages, while still keeping free usage available.

If you need a higher monthly allowance, you can upgrade your plan at any time.

If you have questions about this update or your current allowance, please contact us at helpdesk@kdanmobile.com.

How to Translate a paragraph

You can start translation directly from the document.

1. Open a PDF in KDAN PDF.
2. Select a paragraph.
3. The AI quick menu appears.
4. Click Translate This.
5. Translator opens on the right side and shows the result.

The paragraph translation panel opens on the right side.

The Translator panel displays:

• Source Text (read-only)
• The translation result under Translate to (editable)

The default target language follows your app language.
Only the selected paragraph is sent for translation.

Change the translation language

You can translate the same paragraph into different languages.

1. In Translator, open the target language selector under Translate to.
2. Choose another language (supports up to 108 languages).
3. The translation updates automatically.

• Each time you change the target language, it uses one translation allowance.

• You can also set your default target language in Settings. This preference applies to all open PDFs.

  

Save translations as annotations

To keep translations for later reference:

1. Review or edit the translation result under Translate to.
2. Click Add to Annotations.
3. The translation will be:
   • Marked in the document
   • Saved in the left-side Annotations panel

Review saved translations

You can access saved translations in two ways:

From Annotations

• Open Annotations and click a Translation item to jump to the source text.

From the document

• Click the translation mark to highlight the source paragraph and open the related item in Annotations.

To show or hide translation marks, go to Settings.

When AI Translation is unavailable

AI Translation may be unavailable if:

• You are not signed in
• Your monthly allowance has been used up
• There is no internet connection

Check your status and try again.

Tips for better use

Translate only what you need
Focus on the paragraphs you want to read closely, not the whole page.

Save key translations for later
Click Add to Annotations to keep important translations in Annotations for quick review and reuse.

Translate more efficiently across languages
Before switching languages, check the first result to make sure it matches your needs.

Organize everything in one place
After translating, add Highlight and Note to mark key points and keep your study materials together.

Updated January 27, 2026 07:03