Free tools that just work.
Fast, private, client-side calculators for finance, health, and everyday conversions — no sign-up, no clutter.
Finance
Mortgage Calculator
Monthly payment with taxes & insurance
Auto Loan Calculator
Estimate your car payment
Loan / Amortization Calculator
Full payment-by-payment schedule
Compound Interest Calculator
See your savings grow
Tip Calculator
Split the bill fast
Sales Tax & Discount
Final price in one step
Discount Stack Calculator
Combine multiple discounts
Health
BMI Calculator
Body mass index & healthy range
Calorie / TDEE Calculator
Daily maintenance calories
Age Calculator
Exact age in years, months & days
Converters & Utilities
Currency Converter
Live exchange rates
Unit Converter
Length, weight, temperature & more
Percentage Calculator
% of, % change, and more
Password Generator
Strong, random & secure
QR Code Generator
Free, no sign-up, download PNG
Days Between Dates
Duration & business days
Percentage Change
Increase or decrease between two numbers
GPA Calculator
Weighted grade point average
Color Converter
HEX, RGB & HSL with picker
Time Zone Converter
Convert times between cities
Text & Dev Tools
Word / Character Counter
Live word count & reading time
Case Converter
UPPERCASE, Title Case & more
Remove Line Breaks
Strip breaks & clean spacing
Find & Replace
Bulk replace, regex supported
Text Sorter
Sort lines & remove duplicates
Lorem Ipsum Generator
Placeholder text, any length
Text Repeater
Repeat text N times
Remove Duplicate Lines
Keep only unique lines
Reverse Text
Flip characters, words or lines
Line Tools
Number lines, add prefix/suffix
Timestamp Converter
Unix time to date, and back
Base64 & URL Encoder/Decoder
Encode or decode text instantly
JSON Formatter
Beautify, minify & validate
Text Diff / Compare
See what changed between texts
Markdown Preview
Markdown to HTML, live
Image to Base64
Encode or resize images
Random Generators
Random Number Generator
Numbers in any range
Random Choice Generator
Pick from a list
Random Date Generator
Random dates in a range
Random Letter Generator
Letters A–Z, any case
Random Month Generator
Pick random months
Random IP Address Generator
IPv4 & IPv6 sample data
UUID Generator
Random v4 UUIDs (GUIDs)
Technology
Storage Calculator
Convert bytes, KB, MB, GB & TB
Internet Speed Calculator
Convert Mbps, Gbps & MB/s
Download Time Calculator
How long will it take?
About ByteSize Daily Tools
ByteSize Daily Tools is a growing collection of free, single-purpose calculators. Every tool runs entirely in your browser — your numbers are never sent to a server, except the currency converter, which fetches live exchange rates. New tools ship regularly — check back for more.