Serious file tools, running entirely in your browser.
filetools.co is a collection of free file tools that do their work on your device instead of on a server. It started as a 3D and CAD converter — reading professional formats like STEP, IGES and BREP alongside every common mesh format — and grew to cover the other things people need to do to a file: editing and converting PDFs, images, audio, video, structured data and a set of everyday utilities.
There is no account, no upload limit, no watermark and no paid tier.
The engines are the established ones, compiled to run inside a tab. CAD geometry goes through a full B-rep kernel — the exact surfaces of a STEP file, not a mesh approximation of them — with a WebGL renderer for meshes and display. PDFs are read and written entirely in the browser. Scanned pages are recognised by an OCR engine running on your own CPU, and audio and video are transcoded by a media encoder in the same tab. All of it arrives as WebAssembly and JavaScript and executes client-side, which is why the site keeps working after you disconnect from the internet.
Running locally does not make the operations free of consequences. Rasterising a page to compress it destroys its selectable text. Decimating a mesh softens its edges and can break the watertightness a slicer needs. OCR misreads a bad scan. Each tool states which of these applies to it.
The files people convert are rarely disposable. A CAD assembly is often the intellectual property itself. A PDF is a contract, an invoice, a medical letter, a passport scan. A photo carries the coordinates of the house it was taken in. Conventional online tools ask you to hand all of that to infrastructure you know nothing about, under a retention policy you did not read.
Here the question does not arise, and you do not have to take our word for it: open your browser's network panel while a tool runs and watch that no request contains your file. Read more in our guide to conversion privacy or the privacy policy.
It is not a replacement for a full CAD system, a desktop video editor or Acrobat Pro, and it does not pretend to be. Very large files are bounded by what a browser tab can hold in memory, and encoding on your own CPU is slower than a server with hardware acceleration. When a job is genuinely too big, a desktop application is the right answer, and the guides name the sizes where that point arrives.
The code that reads and writes your file is downloaded to your device and executed inside the tab, the same way a web application runs. Your file is opened from your own disk into browser memory, processed there and written back out. No request carries it anywhere, so there is no server to trust, no queue to wait in and no copy left behind.
The tools are free, unlimited and unwatermarked, with no account. The catch is that processing happens on your own hardware: a very large video or a hundred-megapixel scan will be slower than a server would be, and extremely large files can exhaust a browser tab’s memory.
Most online converters are upload sites: your file goes to their infrastructure, gets processed there and comes back as a download link. That is why they need size limits, queues, accounts and retention policies. Because nothing is uploaded here, none of those exist — and neither does the exposure of handing a confidential document to a third party.
Yes, once a tool page has loaded. The processing code is already on your device at that point, so you can disconnect from the internet and keep working. It is the simplest way to prove to yourself that nothing is being uploaded.
Established engines rather than reimplementations: a full CAD geometry kernel and a WebGL renderer for 3D, a complete PDF reader and writer, an OCR engine, and a video and audio transcoder — all compiled to WebAssembly or written for the browser, and all running client-side.
No files and no personal data. We do use Google Analytics to count page views and see which tools are used, which sets its own cookies and records technical details like device type and referring page. It never receives your files. The privacy policy sets out exactly what that covers.