AI PDF Translator
Translate the text of a PDF into another language, without uploading the file.
Before you use this: These AI tools run on a free Cloudflare allowance, so they are limited to 5 requests per person per day. Every other tool on this site is unlimited — the difference is that those run entirely on your device, while this one needs a server.
Result
How to use this tool
- Select your file, drag it onto the box above.
- Processing starts automatically — there is nothing to configure.
- Check the result panel, which shows the original size, the final size and the page count.
- Click Download to save it.
Text is extracted in your browser and only the text is sent. You get plain translated text back — layout and formatting are not preserved, because the translation is of the words, not the document.
AI PDF Translator — the specification
| Output | Plain translated text |
|---|---|
| Formatting | Not preserved |
| Text sent | Up to 6,000 characters |
| Limit | 5 per day per person |
| Languages | Twelve common targets |
How it works
This is the one part of the site that needs a server. A language model cannot run in a browser at usable speed, so your text is sent to a small Cloudflare Worker, processed at the edge, and returned. The file — where there is one — never leaves your device; only text does.
How it is kept safe and free: there is no API key anywhere, because Cloudflare's AI is bound directly to the Worker rather than authenticated with a token that could be stolen from the page. The prompts live on the server, not in your browser, so the endpoint cannot be repurposed as somebody's free chatbot. An invisible human check and a per-person daily cap keep the shared free allowance available to actual visitors.
Nothing you send is stored, logged, or used for training.
What this page sends, and what the model is told
Every other tool on this site publishes a measured run, because every other tool runs on your device and anyone can reproduce the numbers. This one sends text to a server, and a language model does not give the same answer twice — so printing one response here and calling it a measurement would be dishonest. What can be published exactly is the contract: what leaves your browser, and what the model is told to do with it.
Step one, measured: the text comes out on your device
This part is reproducible, so it is measured rather than described. The reference document below was put through this page in a browser, with the outbound AI request switched off, to record what the extraction step alone produces.
| File given to the page | 5.6 KB, 3 pages |
|---|---|
| Text pdf.js extracted | 3,879 characters, 660 words |
| Of the 6,000-character budget | 65% used |
| Bytes of the PDF uploaded | none — the file object never leaves the page |
The word count out matches the word count in exactly, which is the useful check: nothing was dropped and nothing was added. Elapsed time is deliberately not quoted — almost all of it was the one-off download of the pdf.js module, and it varied by a factor of two between runs, so a figure here would say more about the test machine than the tool.
If your own PDF is a scan, this step finds nothing, because scanned pages are images with no text layer. The page tells you that instead of sending an empty request.
Step two: exactly what is sent
One HTTPS POST, with this body and nothing else. No file, no cookie, no account, no identifier for you:
{
"task": "pdf-translate",
"text": "<text extracted from your PDF>",
"target": "Arabic",
"turnstile": "<one-time human-check token>"
}
Note what is not in there: the prompt. The browser sends a task name, never an instruction. That is what stops the endpoint being repurposed as somebody else’s free chatbot, and it is why there is no API key anywhere in this page’s source for you to find.
Step three: exactly what the model is told
The server holds the prompt. This is it, verbatim, for this page:
You translate text accurately. Return only the translation, preserving paragraph breaks. Do not summarise or explain.
And the message your text is wrapped in:
Translate the following into Arabic: <text extracted from your PDF>
The limits, as the server enforces them
| Model | @cf/meta/llama-4-scout-17b-16e-instruct, on Cloudflare Workers AI |
|---|---|
| Longest text accepted | 6,000 characters — longer is refused, not silently truncated |
| Longest reply generated | 600 tokens |
| Per person, per day | 5 requests, resetting at midnight UTC |
| Whole site, per day | 280 requests, after which the tool stops rather than starts costing money |
| Accepted from | https://onlineaitool.com and https://www.onlineaitool.com only |
Why you should still read the output. The prompt above tells the model not to invent facts, and that instruction helps. It is not a guarantee. Treat what comes back as a draft to check against what you actually know — particularly for anything with a date, a figure or a name in it.
Who needs AI PDF Translator
Understanding a document in a language you do not read — a contract, a notice, an official letter.
AI PDF Translator — frequently asked questions
Is this good enough for official documents?
No. Official and legal submissions almost always require a certified human translator, and machine output will be rejected. Use this to understand what a document says, not to submit anywhere.
Does it keep the layout?
No. You get the text translated as text. Tables and columns do not survive.
Is my text sent to a server?
Yes — and this is the one part of the site where that is true. AI needs a model that cannot run in a browser, so your text goes to a Cloudflare Worker, is processed, and comes straight back. It is not stored, not logged, and not used for training. If that matters for your document, use the tools that run fully on your device instead.
Why only 5 uses a day?
The AI runs on Cloudflare's free tier, which gives the whole site a fixed daily allowance. Without a per-person cap, one script could drain it before breakfast and nobody else would get to use it. The limit resets at midnight UTC.
Can I trust the output?
Read it before you use it. Language models produce fluent text that can still be wrong, and they occasionally invent detail. The prompts here explicitly instruct the model not to add facts you did not provide, but treat every result as a first draft to check, not a finished document.
Is this tool really free?
Yes. No account, no trial period, no watermark on the output and no cap on how many times you use it. The site is funded by advertising.
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Background reading: Every PDF Tool You Need, and When to Use Each
Your file never leaves your device. Open your browser's Network tab while you use this page and you will see no upload — how that works.
Disclaimer. AI output is a draft, not a fact-check. Read it before you use it, and never let it invent an employer, a qualification or a number you cannot stand behind. Full disclaimer.