This corner of the site holds the free online calculators and generators that don’t need a whole category of their own but earn their keep daily: an age calculator that knows about leap years, a ratio converter for scaling anything proportionally, a QR code generator with real customization, and a subtitle format converter. Like every tool on How7o, they run in your browser with no signup and no data sent anywhere.
Age Calculator — exact to the second
The Age Calculator takes a date of birth and returns your age in years, months and days — plus totals in weeks, hours, minutes and seconds, the weekday you were born, your zodiac sign, and a countdown to your next birthday. It handles the traps naive date math gets wrong: leap-day birthdays, end-of-month rollovers, and “as of” dates in the past or future (useful for forms that ask your age on a specific cutoff date).
Ratio Converter — scale anything proportionally
The Ratio Converter solves the everyday “A is to B as C is to what?” problem: resizing an image without distorting it, adapting a recipe from 4 servings to 7, or converting a 16:9 frame to fit a 4:5 crop. Enter the ratio and one known value; it fills in the missing one instantly.
QR Code Generator — with logos and colors
The QR Code Generator turns any URL, text, Wi-Fi login or contact card into a scannable code — and unlike most free generators, it lets you set foreground and background colors, round the modules, and embed your logo in the center, then download a crisp PNG. Because generation is client-side, the destination URL is never logged by anyone, and the codes never expire.
ASS to SRT — make subtitles universal
Fansubs and karaoke files often ship as styled .ass subtitles that TVs and phones refuse to load. The ASS to SRT Converter strips the styling and produces a clean .srt that every player understands — single files or a whole season batch zipped in one download.
Worked example: a Wi-Fi QR code for your guest room
Open the QR Code Generator, choose the Wi-Fi type, enter the network name and password, match the colors to your wall print, and download the PNG. Frame it, and guests connect by pointing their camera — no more spelling out a 16-character password. The password was encoded on your device and never sent anywhere.
Small tools, done properly
Utilities like these are usually an afterthought — a thin form wrapped in ads, wrong on edge cases. Ours are built with the same care as the big tools: the Age Calculator is tested against leap-day birthdays and month-end rollovers; the QR Code Generator renders at print resolution and keeps error correction high enough that an embedded logo never breaks scanning; the ASS to SRT Converter preserves timing to the millisecond while stripping styling tags cleanly. And because everything runs in your browser, a birthday, a Wi-Fi password or a subtitle file is never transmitted anywhere.
Common jobs, mapped to the right tool
“How old was I on 1 January 2000?” — the Age Calculator with a custom “as of” date. “Scale this 1200×800 image to 900 wide” — the Ratio Converter says 600 high before you reach for a calculator. “Put our menu behind a QR code on every table” — the QR Code Generator with your brand colors and logo, downloaded as one PNG per table if you like. “The TV won’t load these subtitles” — the ASS to SRT Converter, single file or whole-season batch.
Looking for more? The text tools include a password generator and counters, and the full tools index lists every utility on the site.