Guides
Short, practical answers to common file problems, with the free tools that solve them without uploading anything.
- How to take a passport photo at home and print it at the right size
Light, background and distance for a photo that passes, the common sizes (35×45 mm, 2×2 inch), and how to print copies for a few cents or upload it to an online form. - How to remove the location from your photos before you share them
Photos can carry the exact GPS spot where they were taken. How to check, and how to remove it on iPhone, Android, Windows and Mac, or in your browser. - Is it safe to upload your documents to an online converter?
What happens to a passport scan or contract when you upload it to a free PDF site, what to check first, and how to tell if a tool really works offline. - HEIC to JPG: open and convert iPhone photos on any device
Why iPhone photos are .heic, how to make the iPhone save JPG instead, and how to convert HEIC on Windows, Mac or Android without installing anything. - How to make a video vertical for TikTok, Reels and Shorts
The shape each app wants (9:16, 4:5, 1:1), cropping versus adding bars, where to keep faces and text, and how to crop a video to vertical in your browser without uploading it. - How to send a large video by email
Attachment limits for Gmail, Outlook and others, why a 23 MB video still bounces, how long a video fits, and how to shrink one in your browser without uploading it. - How to make a PDF small enough to email
Email attachment limits for Gmail, Outlook and others, why some PDFs are huge, and how to shrink one without losing readable text. - How to sign a PDF without printing it
Sign a contract or form on your computer or phone: draw, type or photograph your signature, place it on the page and send it back, without a printer or scanner. - How to redact a PDF properly (and why black boxes don’t work)
Drawing a black rectangle over text in a PDF usually hides nothing: the text is still underneath. How redaction fails, and how to remove information for real. - How to password-protect a PDF
The difference between an open password and permissions, how strong PDF encryption is, and how to share a protected PDF without giving the password away. - How to check a download is genuine with its checksum
What SHA-256 checksums are, why software sites publish them, and how to check one on Windows, Mac, Linux or in your browser.