Privacy & how it works
No fine print. Here's exactly how Mesa PDF works under the hood.
Where does my file go when I upload it?
Nowhere. When you drop a PDF or a photo into any of these tools, the file stays loaded in your own browser's memory. All the work — merging pages, compressing, encrypting, reading metadata — is done by your computer or phone, using only JavaScript code that runs locally. Your file's content is never sent to a server of ours, or anyone else's.
You can check this yourself: open your browser's developer tools (the "Network" tab), use any tool on this site, and you'll see no request goes out carrying your file's content. Only the code (.js) and style (.css) files that make the page work are loaded at the start — never your documents.
Why does it work this way?
Every tool here uses open-source libraries that run in the browser: pdf-lib to create and edit PDFs, pdf.js to read and render pages, plus a couple of specific libraries for reading photo metadata or converting HEIC files. None of them need a server: they process the file's bytes directly on your device.
What happens to the file when I close the tab?
It's gone. No copy is kept anywhere — not on a server, not even in the browser itself — except the final file you choose to download. If you close the tab without downloading the result, you'll need to upload the file again and redo the process.
Do you use cookies?
No. This site doesn't use cookies of any kind, so there's no need for a consent banner.
Do you collect any data?
We use privacy-friendly, cookie-free analytics that doesn't identify individual people (aggregated and anonymous): we only know how many visits each tool gets, roughly which country visitors come from, and which pages get used most, so we know where it's worth spending more time. That analytics never has access to the contents of your files — it only measures page visits.
Why do some tools load an external library (CDN)?
A few tools (like the QR code generator or the HEIC converter) load a small library from a public CDN the first time you open that page, the same way the page fonts are loaded. That only transfers the library's code, never your files — processing still happens entirely in your browser once it's loaded.
Who's behind Mesa PDF?
Acerkate, a cybersecurity, web development and digitalization company based in Jumilla, Spain. Mesa PDF is a free tool we offer because we use it ourselves, day to day.