All tools — Page 6
983 useful tools. Browse a category or search the full toolkit.
Barcode Generator
Generate Code128, Code39, EAN or UPC barcodes with validated encoding.
QR codesQR Payload Builder
Build calendar-event, geographic, SMS or telephone QR payloads in one local workflow.
FilesZIP File Workbench
Create a ZIP, list safe entries or extract one file under strict expansion bounds.
FilesData URL Workbench
Encode local file bytes as a data URL or decode a pasted data URL into a file.
PDFImages to PDF
Place local raster images on ordered PDF pages with explicit fit and page sizes.
PDFPDF Page Organizer
Merge and reorder pages from bounded plain-object PDFs and apply quarter-turn rotation.
PDFPDF Metadata Editor
Inspect or replace supported Info fields in a bounded plain-object PDF.
PDFPDF Page Inspector
Inspect page dimensions, boxes and rotations in bounded plain-object PDFs.
PDFPDF Form Workbench
List or fill supported AcroForm fields in a bounded plain-object PDF.
PDFPDF Page Stamper
Add text or page numbers to bounded plain-object PDF pages.
CalculatorsDebt Payoff Calculator
Estimate how many monthly payments a fixed balance needs at a supplied nominal interest rate.
CalculatorsNet Present Value Calculator
Discount a cash-flow list with its initial amount at period zero and show the periodic valuation.
CalculatorsInternal Rate of Return Calculator
Find a bounded periodic IRR for an initial outlay followed by nonnegative receipts.
CalculatorsPayback Period Calculator
Find when cumulative nonnegative receipts recover an initial outlay, without assuming annual periods.
CalculatorsBook Depreciation Schedule Calculator
Create a straight-line or double-declining book depreciation schedule with an explicit salvage floor.
CalculatorsInventory Turnover Calculator
Measure period inventory turnover and days from COGS and opening/closing balances.
CalculatorsCash Conversion Cycle Calculator
Combine inventory, receivable, and payable holding periods using matched financial inputs.
CalculatorsLiquidity and Working Capital Calculator
Calculate current ratio, quick ratio, and working capital in one balance-sheet snapshot.
CalculatorsCash Runway Scenario Calculator
Estimate time to a protected cash reserve under constant monthly cash inflows and outflows.
CalculatorsSubscription Unit Economics Calculator
Compare acquisition cost, modeled gross-profit lifetime value, and contribution payback.
CalculatorsEconomic Order Quantity Calculator
Estimate a classic order batch and compare adjacent whole-unit cost candidates.
CalculatorsReorder Point and Safety Stock Calculator
Model a stock trigger from independent daily demand, fixed lead time, and a supplied service z-score.
CalculatorsFixed-coupon Bond Valuation Calculator
Discount an ideal fixed-coupon bond and report its cash-flow-weighted duration.
CalculatorsLease Versus Buy Cost Scenario Calculator
Compare explicit ownership and lease cost streams over a common horizon.
MathMatrix Operations Calculator
Add or multiply bounded matrices, or compute a square matrix determinant or inverse.
MathPolynomial Evaluation Calculator
Evaluate a coefficient-defined polynomial and its derivative at a list of points.
MathTabulated Numerical Integration Calculator
Estimate signed area under supplied samples using the composite trapezoidal rule.
MathLinear Interpolation Calculator
Estimate values inside ordered sample intervals and identify their bracketing coordinates.
MathVector and Coordinate Calculator
Find dot product, magnitude, displacement distance, angle, and three-dimensional cross product.
MathComplex Number Calculator
Add, subtract, multiply, or divide two complex values with explicit rectangular components.
MathLogarithm and Exponent Calculator
Evaluate a real logarithm or power with explicit base and domain checks.
MathArithmetic and Geometric Sequence Calculator
Find a progression’s nth term and finite sum with explicit zero-count and unit-ratio behavior.
MathModular Arithmetic Calculator
Calculate exact modular powers or inverses for bounded whole numbers.
MathInteger Factorization Calculator
Factor a bounded positive integer into exact prime powers and verify reconstruction.
MathChinese Remainder Theorem Calculator
Solve compatible residue and modulus pairs, including noncoprime moduli.
MathCoordinate Polygon Area Calculator
Measure a simple Cartesian polygon from ordered vertices, including its signed orientation.
MathCone and Frustum Calculator
Calculate volume and open or closed surface area for a right circular frustum, including a cone.
MathEllipse Calculator
Calculate ellipse area and a converged numerical perimeter from two semiaxes.
MathRectangular Prism Calculator
Find box volume, closed surface area, and space diagonal from three positive lengths.
MathGreat-circle Distance and Bearing Calculator
Estimate spherical surface distance and initial bearing between two latitude/longitude pairs.
MathOhm’s Law and DC Power Calculator
Solve voltage, current, resistance, and power from an explicit independent input pair.
MathSeries and Parallel Resistor Calculator
Reduce a bounded list of ideal resistances in one simple series or parallel topology.
MathRC Transient Calculator
Model an ideal first-order capacitor voltage after a DC step or discharge.
MathPace and Even Split Calculator
Calculate measured pace, speed, and equal-distance split durations from an elapsed activity.
MathNormal Distribution Calculator
Find a normal cumulative probability, upper tail, or inverse quantile with a supplied mean and deviation.
MathPoisson Probability Calculator
Evaluate an event-count probability and both cumulative tails for a supplied expected count.
MathHypergeometric Probability Calculator
Calculate successes in sampling without replacement from a finite population.
MathMean Confidence Interval — Known SD
Construct a two-sided interval for a population mean when the population standard deviation is known.