Konvizi
Free No upload
Add a text layer to your scans so you can search for a word and copy passages, or get their text, without uploading anything.
Drop your PDF files here
or
Your files stay on your device
Konvizi’s “OCR PDF” tool is free, with no sign-up, no watermark and no file limit. All the processing happens in your browser, on your device: your files are never uploaded to a server, which makes it suitable for personal and confidential documents.
Drag your scanned PDF into the box above or click “Choose files”.
Choose the language of the document, then “Searchable PDF” or “Text only”. Click “Read text”.
Pages are read one after another, a few seconds each. The file is then ready to download.
A PDF made by a scanner or a scanning app only contains pictures: you cannot search for a word or copy a sentence. Konvizi reads each page with Tesseract, then places the recognised text, invisibly, exactly under the words on the page. The document looks the same as before, but you can now search it and copy text. You can also get just the text, as a .txt file.
PDF is the universal document format: it looks the same on every device, keeps its layout and prints without surprises.
Text recognition usually means sending your scans to an online service. Konvizi runs Tesseract, the leading open-source OCR engine, right in your browser: your scanned documents stay with you. The engine and language model are downloaded from konvizi.com the first time, then kept by your browser.
Your files never leave your device. No upload, no storage.
No upload and no queue: the conversion starts right away.
As many files as you like, with no imposed size limit.
No sign-up, no watermark, no subscription.
| Konvizi | Typical online converter | |
|---|---|---|
| Where your files are processed | In your browser, on your device | On the service’s servers |
| Upload to the internet | None | Required, then you download the result |
| Storage of your files | None: nothing is stored | Stored on a server, at least while processing |
| Waiting time | Starts instantly | Upload time, sometimes a queue |
| Account | Never required | Often required beyond a few files |
| Watermark and limits | No watermark, no maximum number | Common on free plans |
Yes, completely: no sign-up, no watermark, no page limit.
No. Everything happens in your browser, on your device. Your files are never sent over the internet: nobody but you can see them.
Pages that already contain real text are left as they are: only scanned pages are read. If no page needs it, Konvizi tells you.
No. The pages stay the same: the recognised text is added invisibly, for searching and copying. Recognition quality depends on the scan: 300 dpi and a straight page give the best results.
Open your browser’s developer tools (F12 key), go to the “Network” tab and run a conversion: no request carries your file. The site also enforces a security rule (Content-Security-Policy) that forbids the browser from contacting any site other than konvizi.com, and konvizi.com is a static site with no service able to receive files.
Yes. Konvizi works in the browser of your phone or tablet (Safari, Chrome…) just like on a computer, with no app to install. Very large files are processed faster on a computer, which has more memory.