[PR] A tool that visualizes the reliability of primary sources through translation. This is a PR in the sense of public relations, not a pull request.

1. This is a PR. It is not a pull request.

I will state this clearly from the start. This article is a PR piece written at the formal request of the Immersive Translate management team.

Engineers, please calm down. It will not be merged. No review requests will be sent your way. This is the advertising kind of PR.

Although this is a sponsored article, I will not change my writing style from my usual verification articles. I will use the tool in practice and write about its pros and cons separately. The reason is simple: the subject of this article is a 'tool for not taking translations at face value.' It would be absurd if a tool review article took translations at face value.

Furthermore, in the latter half of the article, I will include a 9% off code for readers, which was provided for this collaboration. I have not used any referral programs or affiliate links.

2. With just a translation, you cannot see how to 'read' the primary source.

I usually write articles after checking primary sources such as official announcements from overseas AI companies, system cards, release notes, and research papers. I don't wait for Japanese summary articles—or rather, I can't wait. It's partly a matter of timeliness, but more importantly, information is slightly distorted every time it passes through a summary.

My style until now has been to 'post the URL and introduce the necessary parts by translating them into Japanese.' This method itself is not wrong. However, it has a structural weakness.

A translation is not the primary source itself. It is the result of me reading the primary source and replacing it with another language. If I only extract and post the translated text, it becomes impossible for the reader to see 'which original text was read and how it was interpreted.'

The responsibility for the accuracy of the translation rests with me, and the reader has no choice but to trust my reading. Even if I intend to be sincere, I am keeping the reader away from the entry point of verification. I have always felt this discomfort.

What struck me most when I tried Immersive Translate was precisely this point.

3. Even if there is a mistranslation, the verification remains intact.

The core of Immersive Translate is its bilingual display, which places the translation directly below the original text without deleting it.

To show how valuable this is, I will dare to provide an example of a mistranslation.

It happened when I was reading a Reddit post using the bilingual display. In a post introducing an incident involving a former Space Shuttle astronaut, the English term 'pepper spray' was translated as 'spice spray'.

It is not a misting device for spices. It is tear gas.

The important part starts here.

The translation was wrong. However, I noticed it in an instant. That is because the original text remained right above it.

If it were a method that only displayed the translation, I might have just skimmed over 'spice spray.' The bilingual display does not eliminate mistranslations. It leaves clues on the screen to help you notice them.

It is not about being able to trust it unconditionally because it is highly accurate. Because the display allows you to immediately notice a mistranslation by comparing it with the original text, you can read on with peace of mind.

Rather than a translation tool, it is a device for creating transparency in citations. For someone who writes articles dealing with primary sources, I felt this was far more significant than a few percentage points of difference in translation accuracy.

4. Reading an 81-page System Card with BabelDOC

So, how well does it hold up in practical work?

The subject is the GPT-5.6 System Card released by OpenAI on July 9, 2026. On my download screen, it was displayed as 81 pages in total. It is an ideal document for verification material, complete with chapter structures, tables, formulas, and graphs.

The official name of the PDF translation feature I used this time is BabelDOC. It is currently in the Beta development stage and is being improved based on user feedback.

Note that in my environment, I checked the PDF translation from the browser version rather than the app side. The navigation may differ depending on the device, version, and plan.

In Immersive Translate's file translation, you can handle PDF, EPUB, HTML, JSON, TXT, DOCX, Markdown, and subtitle files even in the standard translation mode.

On top of that, there are differences in the roles of PDF-related features.

PDF Pro is a feature that supports the translation of scanned PDFs saved as images. BabelDOC is suited for creating bilingual documents that place the original text and translation side-by-side while maintaining the PDF layout as much as possible.

This time, I used BabelDOC and checked it by dividing it into three layers.

Document structure—chapters, headings, and paragraphs

The chapter structure and table of contents, such as Introduction, Model Data and Training, Model Safety, and Preparedness, were maintained even in the bilingual display.

If the table of contents breaks in a long PDF, the reader loses track of 'where in the document they are currently reading.' The fact that the table of contents and chapter structure remain is a prerequisite for reading long documents, even if it seems trivial.

When output as a bilingual PDF, the original page and the translated page were lined up side-by-side.

Information structure—tables, numerical values, and graphs

In the safety evaluation table, numerical scores like 0.955 and 0.987 were maintained as they were, and the category names were translated.

In evaluation documents like a System Card, it is important that numerical values do not change during the translation process. Even if the text is natural, if the correspondence between numbers and columns breaks, it cannot be used as a reference document.

The graphs themselves are placed as images and are not translated, but because the captions and surrounding text are bilingual, I could follow what the figures were indicating.

Symbolic structure—formulas, variables, and statistical terms

This is what surprised me the most.

In the explanation of the Wald test, there is a paragraph where formulas and variables like log₂R and k_eff appear. If you paste this directly into a normal translation field, it is a place where the boundary between formulas and text is easily broken.

With BabelDOC, the text before and after the formulas was translated into Japanese while the formulas remained intact.

For technical terms like 'resampling fidelity error' that need to be read while confirming their meaning within the document, you can judge them by comparing them with the original text rather than just looking at the translated terms.

Formulas and statistical terms are areas where mistranslations or misinterpretations have a greater impact than in general text. That is precisely why there is meaning in reading them with the original text side-by-side. The point I touched on in Chapter 3, 'Even if there is a mistranslation, the verification remains intact,' applies directly to practical work.

Points to note

Translating the entire 81 pages took a considerable amount of time. It is different from the feeling of translating a short web page.

The download screen also displayed a warning that memory overflow might occur when processing PDFs exceeding 300 pages.

Also, in my environment, the navigation for saving a text-based PDF went through the browser's print function. Knowing this in advance will prevent confusion.

5. No need to move from the place where you read overseas information

Official documents like a System Card are just the starting point of an investigation.

My usual workflow is generally like this.

Read the official PDF. Check the background in overseas news. Watch explanations on YouTube. Look for user reactions on Reddit.

Where Immersive Translate was effective was that 'copy-and-paste to a translation site' disappeared in all sections of this workflow. You can check the original text and the translation while staying where you are reading. Your thinking during the investigation is not interrupted.

Overseas news

On the overseas news site Semafor, the entire page, including headlines, lead sentences, and the world overview in the sidebar, became bilingual.

You can access the original article directly without waiting for a Japanese summary article.

However, just because a news translation is natural does not mean that fact-checking is complete. Checking the publisher, update date and time, and citation sources is still necessary.

The bilingual display is a tool to 'make verification easier,' not a tool to allow you to skip verification.

YouTube

On YouTube, English subtitles and Japanese translations are displayed on the same screen.

I was able to check parts I couldn't hear or technical terms without stopping the video. If the auto-generated subtitles are the source, you need to be careful about recognition errors in the subtitles themselves, but because you can see the English subtitles and the translation at the same time, it becomes easier to notice any discrepancies.

There is also a web-based video translation that you can use by entering YouTube or X links.

On my screen, a guideline was displayed indicating that for a video of about 5 minutes, it takes about 30 seconds, and thereafter the translation time increases by about 1 minute for every 10 minutes of video length. There was also a display stating that it does not currently support videos exceeding 4 hours.

Reddit

On Reddit, the post body is translated while leaving the original text, so you can quickly grasp the gist even in English that includes slang.

It is suitable for situations where you are looking for bug reports that you cannot understand from official announcements alone, or reactions from people who have actually used it.

However, you need to distinguish the nature of the information source.

Official documents are the starting point for fact-checking. On the other hand, Reddit posts are a source of hypotheses and points of contention that should be verified additionally. Both are objects of observation, but their weight as evidence is not the same.

6. Do not trust one translation; compare multiple translations

Being able to choose translation engines is also a feature of this tool.

On the settings screen I checked in July 2026, in addition to free translation services, there were categories such as 'High-performance translation models' and 'Top-class translation models,' and options like DeepL Pro, GPT series, Gemini series, Claude, DeepSeek, and Qwen were lined up. The list of models and classifications may change due to future UI updates.

PLaMo 2.2 Prime was also displayed among these. This is due to the collaboration with the domestic LLM of the Preferred Networks group, which the Immersive Translate management team announced in June 2026.

I was able to confirm that the model name I read in the official announcement also exists on the actual settings screen. This is also a small primary source check.

Even for the same text, there are differences in the translation of technical terms, the handling of proper nouns, and the naturalness of sentences depending on the engine. I have no intention of asserting which one is the strongest. The suitable choice changes depending on the purpose and the text.

What is important is not to view one translation as absolute, but to be able to compare multiple candidates on the spot if necessary.

It is a structure where the functionality supports the idea I wrote in Chapter 3: 'Translations are things to be used by comparing them.'

7. In what situations is BabelFast's speed effective?

I also tried the new feature I was informed about, BabelFast.

In my environment, it was displayed as BabelFast (Beta). It is a feature that focuses on speed and stability when reading YouTube, X, Reddit, and overseas news sites on the Chrome and Mac versions.

This explanation is based on information from the other party and official information, and I will describe it separately from the following usage experience.

The comparison was done simply. I opened the same overseas articles and Reddit posts with BabelFast and multiple translation models, and checked the perceived time until display started, the waiting time until the full text was ready, the translation of proper nouns and technical terms, and any hitches while reading. This is not a strict speed benchmark.

What I can say at this point is that BabelFast is a candidate to try in situations where you want to read overseas content without interruption, rather than just for the purpose of precise translation selection.

What you look for in a translation is different on a day you are chasing breaking news versus a day you are reading a System Card carefully. I felt it was accurate to view it as a difference in purpose, not a simple superiority or inferiority.

8. What was convenient and what should not be left to it

Instead of listing the features again, I will divide them into 'tasks easy to delegate' and 'tasks humans should keep.'

Things easy to delegate to Immersive Translate

Arranging the original text and translation in an easy-to-read manner. Pre-reading long PDFs. Comparing translations using multiple engines. Reading assistance across news, videos, and social media.

Among these, the arrangement of the original text and translation is the subject of this article. For me, this alone is a reason to use it.

Things humans should keep

Final judgment of translated terms. Evaluation of the reliability of information sources. Verification of numerical values, proper nouns, and citations. And the judgment of whether it is okay to send the translation target to an external service.

Spice spray must be caught by a human.

In many online translation services, the text to be translated is sent to the selected translation engine. When handling confidential information, personal information, or unpublished materials, you need to check the terms of service of the service you are using and the rules of your organization.

This is not a problem unique to Immersive Translate, but a premise common to online translation tools in general.

Also, in this article, I have written separately about 'features I actually checked' and 'support scope confirmed as official information.' Navigation and specifications may differ depending on the device, version, plan, etc.

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9% off code for readers

For this collaboration, the Immersive Translate management team has prepared a dedicated code for readers.

Dedicated code: kuroikuropug

By using this code, you can use the target plan at 9% off the regular price. Please check the latest information on the purchase screen regarding application conditions and target plans.

I do not use affiliate links in the article. If you wish to use it, please check from the official website below.

Immersive Translate Official Website

https://immersivetranslate.com/ja/


9. A work environment for returning to the original text, not for translation

To summarize.

Immersive Translate was not a tool to avoid looking at English. At least for me, it is a work environment for advancing understanding in Japanese without leaving the English primary source.

Instead of hiding the original text through translation, it leaves a path to return to the original text.

Even if a mistranslation occurs, it maintains a state where the reader can notice it.

There are few designs that are this compatible with articles that deal with primary sources.

Translation is an observed value. The starting point of judgment is always in the original text.

Being able to place both on the same screen. That is the reason I will continue to use this tool, and the scenery I wanted to show the readers in this article.

Disclaimer

The content of this article is based on information confirmed as of July 2026 and my usage environment. Service specifications, supported features, pricing, available translation services/AI models, screen displays, discount details, etc., are subject to change without notice. Please check the Immersive Translate official website for the latest information and formal terms of use.

Translation results vary depending on the content of the original text, language, context, technical terms, selected translation service or AI model, settings, file format, etc. This article does not guarantee the accuracy, completeness, or fitness for a particular purpose of the translation results. For important uses such as contracts, legal, medical, research, or business decision-making, always check the original text and perform verification by an expert if necessary.

Formulas, tables, figures, complex paragraph layouts, and imaged text in PDFs may have their recognition, translation, or layout broken depending on the document state or the feature used. Since the support scope differs between standard PDF translation and PDF Pro/BabelDOC, please select the feature according to your purpose.

When translating text or files containing personal information, confidential information, internal documents, or unpublished information, please check the Immersive Translate privacy policy, the terms of service/privacy policy of the selected translation service, and your organization's information management regulations in advance. In web page translation, the translation content is sent to the selected translation engine, and in file/image translation and BabelDOC, the input or uploaded content is processed for service provision.

The images in the article include screenshots of the actual usage screen and usage images created to explain the features. The usage images do not perfectly reproduce the actual screen display. Company names, service names, product names, logos, and trademarks mentioned in the article belong to their respective rights holders.

Regarding the target plan, discount rate, usage conditions, validity period, etc., of the dedicated discount code provided in the article, please prioritize the official information displayed at the time of application. I cannot be held responsible for any damages caused by viewing this article or using the service, so please use it at your own judgment and responsibility.

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