Math & Numbers
Compare means across three or more independent groups with a one-way ANOVA F test
one-way-anova-calculatorMath & Numbers
Run a one-proportion Z test from success count, trial count, and hypothesized population proportion
one-proportion-z-test-calculatorMath & Numbers
Run paired-sample t tests from before and after values or precomputed paired differences
paired-t-test-calculatorMath & Numbers
Run a one-sample t test from raw data or summary statistics, including p-value and confidence interval
one-sample-t-test-calculatorMath & Numbers
Calculate one-tailed or two-tailed p-values for Z, t, chi-square, and F test statistics
p-value-calculatorMath & Numbers
Calculate Q1, median, Q3, interquartile range, and optional outlier fences for a numeric dataset
quartile-calculatorMath & Numbers
Calculate the statistical range of a numeric dataset from its minimum and maximum values
range-calculatorMath & Numbers
Solve quadratic equations, classify the roots, and return discriminant, vertex, and factor information
quadratic-equation-calculatorMedia
Extract images from PDFs, match nearby captions, and generate an HTML index package using OpenDataLoader
pdf-image-caption-extractorDeveloper Tools
Extract only selected PDF pages with OpenDataLoader and export the subset as Markdown, JSON, or text
pdf-page-range-extractorMath & Numbers
Simplify ratios, calculate ratio shares, and convert between ratio, fraction, and decimal forms
ratio-calculatorDeveloper Tools
Compare extraction with and without repeated page furniture to spot header/footer noise before using PDF text in RAG, summarization, or editing workflows
pdf-header-footer-noise-remover