Free tools we built.

Calculate the area of rooms, walls, and lots in square feet, plus flooring, paint and material estimates for home projects.

Work out percentages, percentage increase and decrease, percentage of a number, and percentage difference, all in one place.

Find your exact age in years, months, days, hours and minutes from any birth date, plus countdowns to upcoming birthdays.

Encode text or files to Base64 and decode Base64 back to plain text, quickly and entirely in your browser.

Percent-encode and decode URLs and query strings so special characters transfer safely across the web.

Test how strong a password is and get clear feedback on length, character variety and how to make it more secure.

Count words, characters, sentences and paragraphs in your text instantly, with reading-time estimates.

Generate version 1 and version 4 UUIDs in bulk for development, databases and unique identifiers.

Format, validate, minify and explore JSON with a clean viewer that makes messy data readable.

Create MD5, SHA-1, SHA-256 and other cryptographic hashes from text right in your browser.

Convert between Unix epoch timestamps and human-readable dates and times across time zones.

Repeat any text or string a chosen number of times, with options for separators and new lines.

Build and decode cron schedule expressions with a plain-English explanation of when each job runs.

Learn, test and debug regular expressions with live matching and a friendly reference for every token.

A quick reference for converting common units of length, weight, volume, temperature and more.

Add up hours and minutes between times, ideal for timesheets, shifts and payroll calculations.

See the current time across cities and time zones, with a clean world-clock and meeting-time helper.

Convert text between uppercase, lowercase, title case, sentence case, camelCase and more in one click.

Calculate the dimensional (volumetric) weight of packages for accurate shipping cost estimates.

Resize, crop, compress and convert images in your browser without uploading them anywhere.

Find the volume and capacity of boxes and containers from their dimensions, in any unit.

Calculate package girth and length-plus-girth measurements that carriers use for shipping limits.

Understand and convert between profit margin and markup, with clear pricing calculations for business.

Plan IP networks with CIDR notation: subnet ranges, host counts, masks and VLSM, with export options.

Calculate subnet masks, network and broadcast addresses, and usable host ranges from an IP and prefix.

Strip EXIF and hidden metadata from photos and files privately, right in your browser.

Size solar arrays and estimate output and savings for residential and off-grid solar setups.

Calculate loan EMIs, interest and amortization for Indian home, car and personal loans, including credit-card EMIs.

Merge, split, compress and convert PDF files privately in your browser, with no uploads.

Convert and explore colors across HEX, RGB, HSL and more, with palettes, gradients and brand colors.

Generate barcodes and QR codes for text, links and products, ready to download and print.

Calculate voltage drop and wire sizing for electrical circuits using NEC-based formulas.

Estimate calorie needs, TDEE and macros, with tools for weight goals and meal planning.

See the total interest paid on a loan or mortgage, with amortization and payoff comparisons.

Size air-conditioning capacity in tons for a room or home, with cost and efficiency estimates.

Calculate the volume and fill level of cylindrical, rectangular and oval tanks in any unit.

Work out cubic yards of concrete, soil, gravel and mulch needed for construction and landscaping.

Calculate body mass index and basal metabolic rate to understand weight and daily calorie needs.

Size a complete off-grid solar battery bank from your energy use, autonomy days and system voltage.