Konvizi
Free No upload
A free file converter that never sees your files.
Konvizi brings together 63 free tools to convert and edit your files: images (HEIC, JPG, PNG, WebP, AVIF, SVG, GIF, ICO…), PDF (merge, split, compress, sign, protect, OCR…), Word and text, Excel, CSV and JSON, and audio (MP3, WAV, M4A…). The site is available in English, French, Spanish, Portuguese and Hindi.
What makes it different: every conversion happens in your browser. Your files are never sent over the internet.
When you open a tool, your browser downloads the code it needs (JavaScript and WebAssembly) from konvizi.com. When you drop a file, the processor of your computer or phone does the conversion. The result is created in your browser’s memory and saved straight to your downloads.
Konvizi relies on well-known open-source libraries: pdf.js (Mozilla) to read PDFs, pdf-lib to create them, Tesseract for text recognition, lamejs for MP3 encoding and heic2any for iPhone photos. All of them are hosted on konvizi.com.
No file is uploaded, stored or analysed. There is no account, no analytics, no advertising and no tracking cookie. Closing the tab erases everything the page held in memory.
To check it, open your browser’s developer tools (F12), “Network” tab, and run a conversion: no upload shows up. The site’s security policy (Content-Security-Policy) also forbids the browser from contacting any site other than konvizi.com, a static site with no service able to receive files.
Since everything happens on your device, speed and maximum file size depend on its power and memory: a computer handles PDFs with hundreds of pages or long videos faster than an old phone. Some conversions are not offered, such as Word to PDF or PDF to Word, because a browser cannot yet do them with good enough quality.
| 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 |
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.
A question, an idea for a tool or a problem? Write to us: contact@konvizi.com