Simple tools, no strings attached
Workbench is a small collection of privacy-focused browser tools available at ConvertPro.eu. Workbench is the name of the tools; convertpro.eu is the address they live at. If you arrived here from a search result or a link and wondered whether you were in the right place — you are. The two names refer to the same project, and the contact address, hello@convertpro.eu, uses the domain rather than the brand name for the same reason.
Why it exists
Workbench started from an ordinary frustration. Converting a file online usually means handing it to a server you know nothing about, working through a cluttered interface, and waiting for a round trip that did not need to happen — all to change a file format your own computer is perfectly capable of changing by itself.
That is not a complaint about sites needing to cover their costs; running anything on the web costs money. It is about how much of that experience gets in the way of a task that could have finished locally in a second, and about how often an upload happens when nothing actually required one.
Why doing the work in the browser is useful
Browsers have quietly become capable enough to do real file work without help from a server. They can read a file you choose, decode and re-encode images using the same built-in machinery they use to display them, and manipulate document formats using JavaScript libraries that run inside the page.
That has several practical consequences beyond privacy. There is no upload wait, which matters most with the large files that are slowest to send. There is no queue and no server-side size cap. And once a page has loaded, its tools keep working even if your connection drops.
It also has real trade-offs, which are worth stating plainly. Your device's memory becomes the limit rather than a server's, and that limit is lower than most people expect — particularly on phones. Heavier processing is out of reach as a result, which is why Workbench does not offer optical character recognition, PDF compression, or image editing.
What "files never leave your device" means
It is a specific claim, so it is worth being precise about its edges rather than leaving it as a slogan.
When you choose a file, the browser reads it into the tab's memory and the tool works on it there. The file is not uploaded to a Workbench server, not placed in a processing queue, and not stored anywhere by us — there is no server-side copy to retain, because none is ever created. The result is held in your browser's memory until you save it, and the download link stops working once you close or reload the tab. There is no account system, and conversions are not associated with a user account or profile.
What that claim does not mean is that the pages make no network requests at all. They do, like any website. Loading a page fetches web fonts from Google Fonts, and the PDF tools load open-source PDF libraries (pdf-lib and PDF.js) from this site so the work can happen locally. As with any site, the hosting provider can log ordinary technical information such as your IP address. The site may also carry advertising in future to cover its running costs, which would involve the usual third-party requests that advertising brings — and would not change how the tools process your files. The privacy policy sets out the detail.
So the claim is narrow and deliberate: your file is not part of any of those requests. We are not claiming to be the safest converter available, or more secure than anyone else — plenty of thoughtful tools exist. We are saying that this particular architecture removes one specific risk, and that you do not have to take our word for it. Load any tool page, disconnect from the internet, and run a conversion. If it completes, the work happened on your machine, because there was nowhere else for it to happen. This guide explains that test and a couple of others in more detail.
What's here today
Three tools. The Image Converter converts one image or a batch to PNG, JPG, or WebP, and can resize by width or height. Merge PDF combines PDFs or rearranges a single one: page ranges, reordering, rotation, and removal of pages. Image to PDF places PNG and JPG images on A4, Letter, or image-sized pages, one image per page, in the order you choose.
Alongside them is a Guides section covering the background that makes file conversion make sense — choosing between image formats, how JPEG compression works, what resolution and DPI actually mean, and how to get scanned pages into a usable document. Each tool page also carries a detailed reference section covering its limitations and the errors it can produce.
More tools are planned. Each one has to be genuinely useful and has to work locally, which rules out some obvious candidates.
Who runs it
Workbench is independently operated and deliberately small. Workbench does not build user profiles from the files you convert, and the files themselves are not uploaded to us.
Being small is also why the honest answer to "what are the limits?" is usually "your device", and why the guides are careful to say when a job needs software Workbench does not provide.
Getting in touch
If something does not work the way you expect, if a page is unclear or inaccurate, or if there is a tool you would like to see, the address is hello@convertpro.eu. Corrections are genuinely welcome — several parts of this site have been rewritten because a technical claim was not precise enough. There is more detail on the contact page.