Translify is an AI reading companion for foreign-language books. You upload a PDF or EPUB, Translify rebuilds it in your language with the original layout intact, then lets you chat with the whole book, highlight passages for AI explanations, and quiz yourself on what you read.

How is Translify different from Google Translate or DeepL?

Google Translate and DeepL translate text and return a file. Translify gives you a complete reading experience around the translation: chat with the whole book, AI-explained highlights, quiz mode, and side-by-side bilingual reading. It is a study tool, not a translation utility.

Is there a free trial?

Yes — every paid plan starts with a 14-day free trial, no credit card required. Translify also offers a 30-day money-back guarantee on every paid plan, with no questions asked.

Which file types and languages does Translify support?

PDF and EPUB up to 200 MB per book. Translify supports 14 target languages: English, French, Spanish, German, Italian, Portuguese, Dutch, Arabic, Chinese, Japanese, Korean, Russian, Hindi, and Turkish — with correct rendering for right-to-left scripts and CJK characters.

Does the translation keep the book's layout?

Yes. Translify rebuilds every page with the same structure: paragraphs in the same place, images where they were, tables intact, headings preserved. A side-by-side mode lets you switch back to the source at any time.

How accurate are Translify's chat answers?

Every chat answer links back to the exact passage in the source — page number plus a highlighted excerpt. If a faithful citation cannot be found in the book, Translify says so rather than guessing. The underlying model is Anthropic's Claude.

Can I cancel any time?

Yes — one click in account settings. You keep access through the period you have already paid for, and Translify never auto-charges the day after cancellation.

Does Translify train AI models on my uploaded books?

No. Uploaded books are private to your account, encrypted at rest, and never used to train any AI model. You can delete a book and all its derivatives at any time from your library.

Can I really chat with a YouTube video?

You chat with the video's transcript. A tool pulls the caption track, splits it into passages, and finds the passages most relevant to your question to answer from. So you're asking questions about what was said in the video, and getting answers drawn from the actual words — not from the title or the model's general knowledge.

What does a 'timestamped citation' mean?

When the AI answers, it tells you which moment of the video the answer came from — e.g. 12:34 — and links it, so you can jump straight there and hear it in context. It's the difference between 'trust me' and 'here's exactly where she says it.' For studying, that verifiability is the whole point.

Why not just use a summary?

A summary answers a question you didn't ask: 'what is this video broadly about?' When you're studying, you have specific questions — what did that term mean, how did that step follow from the previous one, what were the three causes he listed. A summary flattens exactly the detail you needed. Q&A answers the question you actually have.

Grounded Q&A is far less prone to invention than asking a chatbot from memory, because the answer is constructed from retrieved transcript passages rather than the model's parameters. It's not immune — captions can be wrong, and a model can still misread a passage — but the timestamped citation gives you a one-click way to verify, which a memory-based answer never does.

What should I ask to study effectively?

Ask to clarify ('what did she mean by X here?'), to connect ('how does this relate to what he said earlier about Y?'), to test yourself ('quiz me on the second half'), and to locate ('where does the proof use continuity?'). Avoid asking only for summaries — the value is in the specific, the same way a good study session is built on questions, not re-reading.

How to chat with a YouTube video using AI (and get answers that cite the timestamp)

“Chat with a video” tools are everywhere now, and most of them do the same disappointing thing: paste a link, get a summary, ask a question, get a vague paragraph you can't verify. The version that's actually useful for studying does something narrower and far more valuable — it answers your specific question from what was said in the video, and shows you the exact timestamp it came from.

Summary vs. answer

A summary answers one question: what is this video about? It's useful exactly once, before you watch. The moment you're studying, your questions get specific — what did that term mean in this context? Why does step three follow from step two? What were the three examples she gave? A summary deletes precisely the detail those questions need. That's not a flaw in the summary; it's what a summary is for.

Studying runs on questions, not overviews. So the tool that helps you study is the one that takes your question and returns the relevant passage — not a compression of the whole thing.

How grounded video chat actually works

The mechanism is the same retrieval-augmented generation (RAG) that powers chatting with a PDF, applied to a transcript:

The tool pulls the video's caption track — a timestamped transcript of everything said.
It splits the transcript into short passages, each tagged with the moment it occurred.
When you ask a question, it finds the passages most relevant to that question and gives them to the model as the source material.
The model answers from those passages and cites the timestamp, so the answer is both grounded and checkable.

Because the answer is built from retrieved passages rather than the model's general memory, it stays anchored to what the video actually said. This is the same approach we use for reading academic papers and books: answers that point back to a source you can open.

Why the citation is the whole point

Anyone can generate a confident paragraph. The question that matters when you're learning is: is this right, and where does it come from? A timestamped citation answers both. You click it, you land at 12:34, you hear the speaker say it. If the answer was a slight misread, you catch it in five seconds. If it was right, you've just re-heard it in context — which is itself good for retention.

An answer you can't verify is a rumour with good grammar. A citation turns it into something you can actually trust — or correct.

This is also the honest answer to the hallucination worry. Grounded Q&A invents far less than a chatbot answering from memory, but the real safeguard is that you can check it in one click. A memory-based answer gives you nothing to check against.

What to ask

The quality of your study session is mostly the quality of your questions. Four types do most of the work:

Clarify. What did she mean by “eventual consistency” here? Better than a glossary because the answer uses the video's own framing.
Connect. How does this relate to the caching point from earlier? Forces the material into a structure rather than a list of facts.
Test. Ask me three questions about the second half. Retrieval practice, on demand.
Locate. Where does he derive the formula? Replaces scrubbing the timeline — you get sent to the moment.

Honest limits

It only knows what was said. Captions don't capture what's on screen, so a question about a diagram the speaker didn't describe out loud won't get a good answer. Auto-generated captions can mangle names and jargon, and answers inherit those errors — which is, again, why the click-to-verify timestamp matters. And it isn't a substitute for watching: it's a faster way to find, check, and test, not a way to skip the understanding.

For the full studying workflow this fits into — import, watch, quiz — see how to study from YouTube videos with AI.

Translify lets you chat with any captioned YouTube video and get answers that cite the timestamp, then quiz yourself on what you watched. Free 14-day trial.

Frequently asked

Can I really chat with a YouTube video?: You chat with the video's transcript. A tool pulls the caption track, splits it into passages, and finds the passages most relevant to your question to answer from. So you're asking questions about what was said in the video, and getting answers drawn from the actual words — not from the title or the model's general knowledge.
What does a 'timestamped citation' mean?: When the AI answers, it tells you which moment of the video the answer came from — e.g. 12:34 — and links it, so you can jump straight there and hear it in context. It's the difference between 'trust me' and 'here's exactly where she says it.' For studying, that verifiability is the whole point.
Why not just use a summary?: A summary answers a question you didn't ask: 'what is this video broadly about?' When you're studying, you have specific questions — what did that term mean, how did that step follow from the previous one, what were the three causes he listed. A summary flattens exactly the detail you needed. Q&A answers the question you actually have.
Does it hallucinate?: Grounded Q&A is far less prone to invention than asking a chatbot from memory, because the answer is constructed from retrieved transcript passages rather than the model's parameters. It's not immune — captions can be wrong, and a model can still misread a passage — but the timestamped citation gives you a one-click way to verify, which a memory-based answer never does.
What should I ask to study effectively?: Ask to clarify ('what did she mean by X here?'), to connect ('how does this relate to what he said earlier about Y?'), to test yourself ('quiz me on the second half'), and to locate ('where does the proof use continuity?'). Avoid asking only for summaries — the value is in the specific, the same way a good study session is built on questions, not re-reading.

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