Guides

Remove EXIF before posting to social media. Walks through Mac, Windows, iPhone, Android, and a CLI recipe.

A short, OS-by-OS guide for turning iPhone HEIC images into shareable JPEG — and what happens to quality and GPS metadata along the way.

.dat is a catch-all extension meaning "some kind of data". The first step is to figure out what the file really is — blindly opening it is sometimes risky.

VirusTotal aggregates 70+ antivirus engines and URL reputation feeds into a single report. Here is how to query it correctly, what the result tabs really mean, and when NOT to upload a file.

A .exe is a Windows executable — running it can install anything on your machine. Run these checks before double-clicking, and remember that "clean" is not the same as "safe".

Add an open password to contracts, invoices, and other PDFs — and understand the limits of the editing password.

Renumber photos, change extensions, or prefix log files — with concrete recipes for each OS.

Hash-check OS images and executables on Windows, Mac, and Linux. The first step in catching tampered downloads.

Recompress images, drop unused pages, and flatten embedded fonts to turn "too big to email" PDFs into sub-10 MB files.

Turn a PDF back into an editable docx — understand the trade-off between layout fidelity and table integrity.

Extensions are a filename convention; MIME types are the declaration sent over the wire. When they disagree, browsers and mail clients get fooled — and so do security tools.

Mojibake in Japanese CSV and text files usually means a Shift_JIS ↔ UTF-8 mismatch. Concrete conversion recipes by OS.

Walk through vCard exchange across iPhone, Android, Outlook, and Google Contacts — including batch exports.

Pull MP3 / WAV / M4A audio out of MP4 or MOV. Your re-encode choice decides whether quality holds up.

When you see 'archive is broken', split the problem into download corruption, transfer mishap, or missing central directory — and recover accordingly.

Mail servers typically reject anything over 25 MB. Here are four realistic ways to deliver bigger files by use case.

Combine multiple PDFs into one with free tools. Practical tips when you have many files to stitch together.

Try the trash, then backups, then recovery tools — and remember that stopping disk activity dramatically improves your chances.

Deliver a 1 GB video without resorting to email. Grouped by whether you prioritise quality or speed.

Windows hides known file extensions by default, which helps malware disguise itself. Turn extensions on once and leave them on.

Step-by-step extraction across Windows, macOS, and Linux — plus realistic options when the password is lost.