How much translation is included?

Signed out: 3,000 source characters per UTC day on this browser. Signed-in Free: 30,000 per UTC day. Pro: 3,000,000 per UTC calendar month. Signed-in usage is shared across devices and supported webpage, file, Kindle and video-caption translation. Letters and punctuation count; whitespace and protected code/formulas do not. Translation-service failures are not charged. The same successfully translated passage and target language are charged once within the same period; different segmentation or a new target language can create new usage. Daily quotas reset at 00:00 UTC, and Pro resets at 00:00 UTC on the first day of the month.

Does translating use my listening or Explain allowance?

Translation characters, cloud listening time and AI Explain requests are separate allowances. Translation itself does not start audio or consume an Explain. On-device reading remains free without a time allowance; CastReader AI reading requires sign-in and follows your listening plan. Reaching a translation limit preserves existing translations and the original; you can still listen when your selected voice has allowance. Pro users who reach their translation limit should wait for reset, not buy Pro again.

TRANSLATE & LISTEN · PRACTICAL GUIDE

How to translate vertical Japanese manga on Twi4

A vertical bubble can contain two columns of dialogue and a third, much smaller column of pronunciation marks. Reading all three as separate lines can give a character words they never said.

CastReader · Reviewed: 2026-11-11

See the translation on a real comic

These English translations were captured in official chapters using the CastReader desktop extension preview. Each pair shows the same panel. Open either image to inspect it at full size.

Vertical Japanese → English

Japanese narration becomes horizontal English inside the same two text boxes. The drawing stays visible.

Two childhood friends playing outside, with vertical Japanese narration on either side. — Original Japanese

The same Twi4 panel after CastReader translates the narration into English, including “We often played together when we were little.” — CastReader English translation

トモちゃんは女の子！ · セーラーショック · 柳田史太 · View the chapter on Twi4. Artwork belongs to its respective creators and publishers.

Follow the columns inside one panel

Open strip 2 and locate a bubble with two vertical columns. Read down the right column, then down the column to its left. Small kana beside a kanji give its pronunciation.
In the CastReader extension preview, translate the strip image with Japanese as the image language. Compare the first highlighted phrase with the rightmost column.
Follow the dialogue into the next panel. If a small bubble stays in Japanese, restore the original image and check the words before continuing.

Open Tomo-chan Is a Girl!, strip 2 on Twi4

Try a line of dialogue →

What the two strips revealed

In Tomo-chan, all ten detected blocks displayed Chinese, but some small bubbles had been missed entirely. A phrase about two families living next door was rendered as belonging to the same team. A filled bubble alone cannot establish that the translation is accurate.

In Tsuredure Children, one run translated all three detected blocks in strip 2 and began reading strip 3. Another run left two blocks untranslated and took about 26 seconds to resume. Allow for a pause at strip boundaries.

Read Tsuredure Children, strip 2 on Twi4

How to translate and listen to a MANGA Plus chapter →

Translate a line of comic dialogue

Load an original practice line or type a bubble from the drawing. Choose your languages, then select Translate to compare the text and listen.

Text translation · Preview

Translate, then hear both sides.

From

0 / 2,000

No on-device voice for this language.

Your translation will appear here.

No on-device voice for this language.

Reading speed

Checking translation availability…

Open this language-pair page: Japanese → English

Voices & privacy

Translate sends your input to CastReader’s translation service. This tool does not save your original or translated text. Clear or leave the page to end the session. Reading uses on-device voices; languages depend on your device and browser, and do not use CastReader AI reading minutes.

Translation voice