What your files reveal, what online tools do with them, and how to share without giving more away than you meant to.
Most free tools ask you to hand over a file before they will do anything. For a holiday photo that is harmless. For a passport scan, a signed contract, a medical record or a client's unreleased design, it is a decision you are making on someone else's behalf without quite realising it.
This section is about that difference: what actually happens to a file after you drop it, who could plausibly hold a copy, and how to check for yourself rather than taking a marketing page at its word. It is also where we explain how SnapTools is built and why — see why we built it this way — along with the other common route strangers take to your phone, which is a sticker or a leaflet containing a QR code that is not what it claims to be.
If you only have time for one guide in this section, read the compressor privacy shootout — it is the article most likely to change what you do next time you need to shrink a photo. Before sharing anything personal, use the metadata guide, because a compressed file can still carry your exact GPS coordinates.