How-to 05 guides

Guides that finish the job.

Each one gets you to a finished result and names the best way to get there — including when the best way is a command on your own machine rather than anything on this site. Where you cannot run that command, the browser tools are the fallback, and the guide says so plainly.

Keys and encryption

01 How to generate a PGP key pair Generate an OpenPGP key pair the right way with GnuPG, and the browser way when you cannot install it. Covers algorithm choice, expiry, passphrase, backup and the revocation certificate. Terminal first

Video and audio

01 How to compress a video Make a video small enough to send without making it look bad. What CRF actually does, which knob to turn first, and the one-line ffmpeg command that does most of the work. Either way 02 How to convert audio and video formats Convert between MP4, MOV, MKV, WebM, MP3, WAV and FLAC without re-encoding when you don't have to — and knowing when you do. Either way

Images

01 How to convert between image formats Which image format to convert to and why — JPEG, PNG, WebP, AVIF, HEIC — plus the one-line commands and what silently breaks when you pick wrong. Browser first 02 How to resize images Resize an image without stretching it, softening it or throwing away detail you needed. Covers the aspect-ratio maths, when to resample, and the one-line commands. Either way

All tools Nothing you open here uploads a file