About HexaConvert

HexaConvert is a collection of 24 free tools for converting, merging and formatting files, and every one of them runs inside your own browser. When you drop a file onto a tool, it is read into memory on your device, processed there, and the result is handed back to your browser to save. No file is transmitted anywhere, because there is nothing to transmit it to: the site is a set of static pages with no backend, no upload endpoint and no storage.

The tools cover Text & Developer, Images, Audio & Video, 3D Models and Documents & PDF. There are no accounts, no quotas, no watermarks and no queue. The full list is one page.

Most online converters work by uploading your file to a server, converting it there, and sending the result back. That is convenient for the operator and a poor deal for you: your document, photo or recording sits on a machine you do not control, for a length of time you cannot see, under a policy you probably did not read. Free tools of that kind pay for their servers somehow, and the usual currency is the file itself.

Modern browsers can do this work themselves. WebAssembly runs the same libraries a server would run, at close to native speed; the Canvas and WebGL interfaces handle images and 3D; and a file opened from your disk never has to leave it. HexaConvert is built on that premise from the ground up, which is what makes the privacy claim a description of the architecture rather than a promise. It also means the tools keep working with no connection at all once a page has loaded.

The heavy lifting is done by open source engines compiled to WebAssembly and served from this domain: FFmpeg for audio and video, Mozilla's pdf.js and pdf-lib for reading and writing PDFs, SheetJS for spreadsheets, three.js for 3D models, and ONNX Runtime for the machine-learning models behind the background remover. Every one of those models is chosen for its licence as much as its quality, so that what runs here can be used freely.

The site itself is a static export of a Next.js application, delivered by Cloudflare Pages from locations close to you. There is no server-side code at all, which is why there is nothing that could receive a file even by accident.

HexaConvert is built and maintained by an independent developer, and was launched in September 2026. It is not a product of any larger company and has no investors. Every tool is free and every conversion unlimited, and there is no paid tier; keeping it that way is expected to mean carrying unobtrusive advertising, which can never involve your files because they never leave your device. The analytics that count visits can be switched off with one click in the footer.

The source is written in TypeScript, and the reasoning behind each design decision is recorded alongside the code so that the site stays honest about what it does as it grows.

Questions, bug reports and requests for a tool that is missing are all welcome at [email protected].

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