toolby.dev is a collection of free, no-sign-up utilities that run entirely in your browser — nothing you type or upload is ever sent to a server. It started as a set of developer tools and grew into six categories covering everyday tasks for developers, students, marketers, and anyone who needs a quick calculation or conversion without digging through a bloated app.
Not sure where to start? Use the quick guide below, or jump straight to a category from the menu at the top of the page.
JSON formatting, encoding, regex testing, hashing, and other things you reach for constantly while coding.
Age, loans, calories, salary (with real per-country tax data), tips, discounts and more.
Length, weight, temperature and volume — switch between metric and imperial instantly.
Word counts, placeholder text, URL slugs, and line sorting for writers and marketers.
Generate and download QR codes (including WiFi) and common barcode formats.
GPA calculation, APA/MLA citations, and a typing speed test.
The small, essential tools you reach for constantly in day-to-day work.
Pretty-print messy JSON and catch syntax errors.
Convert text to and from Base64 instantly.
Make special characters in URLs safe to use.
Test your regular expression live and see matches.
Generate SHA-1, SHA-256, SHA-512 hashes.
Generate random UUID v4 values in bulk.
Unix timestamp to human-readable date and back.
Strong, random passwords with adjustable options.
camelCase, snake_case, kebab-case and more.
Compare two texts and see what changed.
Everyday calculations, including a payroll calculator with real per-country tax data.
Get your exact age from a date of birth.
Monthly payment and total repayment on a loan.
Daily calorie needs (BMR/TDEE) from your stats.
Net vs. gross pay — pick your country for real tax data.
Body Mass Index from your height and weight.
X% of Y, ratios, and percentage change.
Exact time between two dates.
Split the bill and calculate tip per person.
Sale price and savings from a discount.
Length, weight, temperature and volume — type a number, get every unit instantly.
Meters, feet, inches, miles and more.
Kilograms, pounds, ounces, stone.
Celsius, Fahrenheit and Kelvin.
Liters, gallons, cups, milliliters.
For writers, marketers and anyone working with text — not just developers.
Count words, characters, sentences and reading time.
Placeholder text by paragraphs, words or sentences.
Turn any text into a clean, URL-friendly slug.
Sort, deduplicate, reverse or shuffle lines of text.
Generate and download instantly. No account, no watermark.
Turn any text, link or contact info into a QR code.
Let guests join your WiFi by scanning.
CODE128, EAN-13, UPC and more.
GPA, citations, and typing practice — the small tools that make studying easier.
Calculate your grade point average.
APA and MLA citations for books and websites.
Measure your typing speed and accuracy.