Practical guides
Choose a task and follow the steps, examples and checks. Each guide explains what the available tools can and cannot do.
Record a browser screen with the audio you actually need
Distinguish tab sound, microphone and system audio, make a short test recording and avoid losing an unsaved capture.
Cut, join and convert audio without surprise quality loss
Plan a clean audio edit, match levels and distinguish extracting an audio stream from re-encoding it to MP3.
Reduce video size without misleading quality promises
Estimate a video bitrate budget, distinguish re-encoding from stream copying and check captions, motion and audio after export.
Can an online alarm ring when the tab is closed?
Understand background suspension, audio permissions and why a browser timer is unsuitable as a guaranteed wake-up alarm.
Percentage points versus percentage change
Compare a change from 20% to 25%, choose the correct denominator and handle zero or negative baselines explicitly.
Plan a meeting across daylight-saving changes
Avoid treating city timezones as fixed UTC offsets and use a concrete date when comparing future meeting times.
What BMI and calorie calculators can and cannot tell you
Understand BMI units, population limits and why calorie equations are estimates rather than personal treatment or nutrition plans.
Calculator checks: precedence, degrees and graph windows
Use small reference calculations to catch operator, angle-unit and graph-scale mistakes before relying on an online calculator.
Convert currency with the rate, direction and fees visible
Calculate an exchange example, distinguish a reference rate from a retail quote and record when the rate was observed.
Browser piano and guitar tuner: latency and microphone checks
Check note names, reference pitch, microphone permission and browser delay before using a music tool for practice.