All Tools
Ten families in one place. Open calculators, converters, text, image, PDF, security, SEO, design, or everyday tools.
Calculators
Percentages, loans, BMI, dates, and everyday math — with the formula in view.
Image Tools
Compress, resize, crop, and convert images in the browser. The file is not uploaded to SmartKitio.
PDF Tools
Merge, split, convert, and inspect PDFs in your browser when possible.
Converters
Length, weight, energy, pressure, and more — instant unit conversion in your browser.
Text Tools
Count words, change case, clean pasted text, and sort lines. Your text stays on this device.
Developer Tools
JSON, Base64, JWT, regex, UUIDs, and formatters. Local processing, no account required.
Security Tools
Passwords, hashes, JWT decode, and encoding. What you type stays in the browser.
SEO Tools
Meta tags, Open Graph, robots.txt, slugs, UTM links, and social previews.
Design Tools
Colors, palettes, contrast, and copy-ready CSS generators.
Everyday Tools
Timers, dice, QR codes, and simple daily cost tools.
Tools
Popular tools
Ready-to-use calculators, converters, and utilities—linked from guides and articles when a deeper explanation helps.
Calculator
Percentage
Work out a percentage of a number, the reverse (“X is what percent of Y?”), or how much a value has gone up or down.
Calculator
Loan
Estimate equal installments on an amortizing loan, plus total interest, from the amount borrowed, annual rate, and length in years.
Image Tool
Compress
Make photos smaller for email, websites, or upload limits by lowering the encoding quality. You can check the result and its file size before downloading.
Image Tool
Resize
Change an image to an exact width and height in pixels, for profile pictures, product listings, or upload requirements.
PDF Tool
Merge
Combine several PDF files into a single document, in the order you add them, without uploading them anywhere.
PDF Tool
JPG→PDF
Combine one or more JPG or PNG images into a PDF, one image per page, for example to send scanned receipts or photos as a single document.
Converter
Length
Convert between metric lengths (millimeters to kilometers) and the international units used in the US and UK (inches, feet, yards, miles). Every unit is defined exactly in meters, so results are exact before rounding.
Converter
Weight
Convert mass between kilograms, grams, milligrams, pounds, and ounces. The pound and ounce are the international avoirdupois units, which are defined exactly in kilograms.