A converter that never sees your files

Most online converters work like this: you upload the file, a server processes it, you download the result. Here there is no server. Everything happens inside the browser tab you have open right now.

Why we built it this way

The things people convert most often are also the most personal: photographed ID cards, payslips, receipts, family photos. Sending them to an unknown server just to change their format makes no sense when your computer or phone can do it on its own. And it can: today’s browsers can decode video, draw PDFs, compress archives and even recognise the text in a photo, with no outside help.

What happens when you press “Convert”

• Images: they’re decoded by the browser (HEIC and TIFF with dedicated libraries), drawn on an invisible surface, the canvas, and saved in the new format. GIF, ICO and BMP are written by our own code; vectorisation to SVG traces the outlines of the colours.
• PDF: pages are drawn by pdf.js, the same engine Firefox uses, and documents are created or edited with pdf-lib. Merging, splitting, rotating, passwords (AES-256) and page numbers work on the original file, without turning the pages into images.
• Documents and e-books: DOCX, ODT, RTF, Markdown, HTML and EPUB are read into a common structure (headings, paragraphs, lists, tables, images) and rewritten in the chosen format. From PDFs, the text placed on the page is recovered.
• Video and audio: they use WebCodecs, the same technology behind video calls, through the Mediabunny library. When possible the stream is copied without re-encoding; otherwise it’s re-encoded using your device’s hardware acceleration.
• OCR: text recognition uses Tesseract compiled to WebAssembly. The first time, the browser downloads 5 to 11 MB of data depending on the language (English, Italian, Spanish or French), always from this website.
• Spreadsheets, archives and fonts: XLSX, ODS, CSV, JSON, XML, ZIP, TAR and WOFF are documented formats that are read and written directly in JavaScript.

Converted files exist only in the browser’s memory until you download them. When you close the page, they’re gone.

Honest limits

• Video and audio need a browser with WebCodecs: recent Chrome, Edge and Opera work best; up-to-date Firefox and Safari are fine, but some output formats may not be available.
• From Word, OpenDocument or PDF the structure and content are preserved, not the exact layout: unusual fonts, columns and text boxes are simplified.
• The old binary DOC, XLS and PPT formats, RAR and 7z archives and AVI, WMV and FLV videos are not supported.
• Huge images (over 16 million pixels) are scaled down to the limit allowed by the browser, especially on iPhone and iPad. With very long videos the limit is your device’s memory.
• Speed depends on your device: a phone that’s a few years old will take a little longer.

How the site pays for itself

The converter is free and has no ads. If you find it useful, you can buy us a coffee on Ko-fi: donations help us pay for the domain and hosting and add new formats. It’s entirely optional: the site works the same for everyone.

Found a problem?

If a file won’t convert or you’re not happy with the result, write to us: tell us the format, the browser you use and what happened. Don’t attach the file if it contains personal data.