Private file workflows10 min read
How to open CSV and Excel files privately in your browser
Choose the right viewer for CSV, TSV, XLS, or XLSX files, understand local browser processing, and inspect spreadsheet data without uploading it.
Guides
Understand the result, not just the number
Focused explanations of how browser tools work, what their outputs assume, and where you should verify before relying on them.
Timekeeping workflows9 min read
Stopwatch vs timer vs date countdown: which should you use?
Choose between elapsed-time measurement, a duration timer, and a date countdown, with practical guidance on laps, deadlines, time zones, and accuracy.
Randomness & decisions10 min read
Browser randomness and fair selection: numbers, dice, and wheels
Understand browser random values, unbiased integer ranges, duplicates, dice rolls, and equal-probability decision wheels before choosing a random tool.
Keyboard diagnostics9 min read
How to test dead keys, ghosting, and keyboard rollover
Use browser keyboard events to test individual keys and combinations, understand key versus code, and investigate dead keys, ghosting, and rollover limits.
Text comparison workflows10 min read
Text comparison modes and workflows: lines, cleanup, and JSON
Choose exact, whitespace-insensitive, case-insensitive, cleaned-text, or formatted-JSON comparison and build a repeatable review workflow.
Privacy & technology8 min read
How browser-based tools handle your data
Learn what “runs in your browser” actually means, what can still leave your device, and how to verify a local-processing claim before using an online tool.
Calculators & methodology10 min read
How to read an online calculator result
A practical guide to formulas, assumptions, rounding, and verification for BMI, loan, compound-interest, GPA, and other browser calculators.
Security11 min read
Passwords, passphrases, and browser encryption
Understand generated passwords, random-word passphrases, strength estimates, password managers, and what password-based browser encryption can and cannot protect.
Accessibility9 min read
A practical guide to WCAG color contrast
Learn the WCAG 2.2 text and non-text contrast thresholds, how ratios are calculated, where simple checkers fall short, and how to test real interface states.
QR & visual delivery9 min read
How to test a QR code before you print it
A practical QR-code review workflow covering payloads, quiet zones, contrast, logos, error correction, print size, scanning distance, and destination safety.
Security & tokens10 min read
JWT decoding is not JWT verification
Understand JWT structure, Base64URL encoding, registered claims, signature verification, algorithm rules, key selection, and safe debugging boundaries.
Files & browser processing11 min read
What browser image and PDF tools can preserve
Understand local file processing, browser memory, canvas re-encoding, PDF page copying, rasterization, metadata, signatures, and practical output verification.