01 / CALCULATOR · 15% · WHOLE CENTS
VAT calculator
Add or extract South African VAT at 15%, worked in whole cents so the three lines always add up.
Free tools — browser only
No account, no adverts, no upload.
Small utilities built for a real need, then tidied up. Each one runs entirely in your browser, costs nothing, asks for no account and shows no adverts.
Network tab stays emptyVAT calculator — 0 requestsSA ID validator — 0 requestsDNS checker — straight to a public resolver
01 — What's here
each page explains how the thing it checks works
02 / VALIDATOR · 13 DIGITS · LUHN
SA ID number validator
Check a 13-digit South African ID number and decode what it says. The number never leaves your browser.
03 / LOOKUP · SPF · DKIM · DMARC
Email DNS checker
Look up a domain’s SPF, DKIM and DMARC records and get a plain-language read on each one.
Most free tools for these jobs are wrapped in three adverts, a cookie banner and a newsletter modal — and several post whatever you typed to a server for no reason at all.
These do not. The VAT calculator and the ID validator make no network requests whatsoever — you can leave the devtools Network tab open and watch it stay empty. The DNS checker has to make requests, because looking up DNS is the entire point, but they go straight from your browser to a public resolver rather than through this site.
They also serve a second purpose, and stating it is better than pretending otherwise: they are working samples. To see what the code behind this site actually looks like before making an enquiry, view the source of any of these pages. The scripts are deliberately shipped unminified and commented, exactly as written.
The same care goes into the paid work.