SmartPlusLab
Tools
Online tools with clear inputs, predictable outputs, and honest privacy and limit notes.
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PDF Rotator
Rotate selected pages in a PDF file by a specified angle, defaulting to 90 degrees.
PDF Tools -
PDF Splitter
Split a multi-page PDF into separate page files or extract custom page ranges.
PDF Tools -
PDF to Text Converter
Extract text content from PDF files online with optional single or multi-page selection.
File Converters -
PDF Unlocker
Remove password protection from encrypted PDF documents by providing the correct password, or pass through unencrypted PDFs unchanged.
PDF Tools -
PDF Watermark
Add custom text watermarks to each page of a PDF document with adjustable opacity.
PDF Tools -
Percentage Change Calculator
Calculate the percentage increase, decrease, or relative shift between an original number and a new number.
Math & Numbers -
Ping Test
Measure TCP connection latency and reachability to any public host or IP address across specific ports.
Network Tools -
PNG to SVG Converter
Convert PNG bitmap images into black-and-white vector tracing text with rectangular SVG paths.
File Converters -
PNG to WebP Converter
Convert PNG images to WebP format online with customizable compression quality.
File Converters -
Port Scanner
Check if specific network ports are open or closed on any server or domain name.
Network Tools -
Power Converter
Convert power measurements between watts, kilowatts, megawatts, horsepower, BTU per hour, and other standard units.
Converters -
Pressure Converter
Convert pressure values between pascals, bar, psi, atmospheres, torr, and other standard units.
Converters -
Prime Checker
Check if a number is prime and find the nearest lower and upper prime numbers.
Math & Numbers -
Prime Factorization Calculator
Break any integer of 2 or greater into its prime factors with a clear breakdown, including repeated factors, total count, and grouped multiplication.
Math & Numbers -
Profit Margin Calculator
Calculate profit margin, markup percentage, and required revenue from unit cost and sales price or target margin.
Finance -
Quadratic Equation Solver
Solve quadratic equations ax² + bx + c = 0 to find real or complex roots, the discriminant, and parabola vertex coordinates.
Math & Numbers -
Random Email Generator
Generate mock email address strings for software testing, form validation, and development datasets.
Generators -
Random Number Generator
Generate random integers or decimal numbers within a specified numeric range with customizable quantity and precision.
Math & Numbers -
Random String Generator
Generate random strings and tokens with configurable length, quantity, character pool, and letter case.
Generators -
Ratio Calculator
Simplify ratios, solve for missing terms in proportions, and compare two ratios online.
Math & Numbers -
Reading Time Calculator
Calculate reading, speaking, and scanning time for any text with an adjustable words-per-minute pace.
Text Tools -
PDF Redactor
Search and redact sensitive text or confidential phrases from your PDF documents online.
PDF Tools -
Regex Library
Browse and copy standard regular expression patterns for emails, URLs, IP addresses, dates, and common formats.
Developer Tools -
Regex Tester
Test regular expressions against sample text online with detailed match positions, text spans, and capture group inspection.
Developer Tools -
Resolution Converter
Convert screen dimensions, calculate aspect ratio and pixel density, or estimate display resolution from diagonal size and DPI.
Image Tools -
RGB to HEX Converter
Convert RGB channel values (0-255) into standard hexadecimal color codes with uppercase, lowercase, and formatted RGB notation.
Color Tools -
Robots.txt Generator
Generate formatted robots.txt directives to guide search crawlers and specify sitemap locations.
SEO & Web -
ROI Calculator
Calculate Return on Investment (ROI), total profit, and annualized return from an initial investment and ending value.
Finance -
Roman Numerals Converter
Convert whole numbers between Arabic integers (1 to 3999) and classical Roman numerals in either direction.
Math & Numbers -
ROT13 Cipher
Apply a ROT13 letter-substitution cipher to rotate text characters by 13 positions.
Developer Tools