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Browse the tool catalog | Page 228

Search and filter the online tool directory by task, format, and category, then open detailed pages with clear inputs, examples, and execution context. Page 228.

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Math, Date & Finance639

Calculators, numerics, date logic, statistics, and finance tools

Images, Audio & Video600

Image, audio, and video processing, conversion, and optimization tools

Design & Color294

Color, layout, graphics, visual styling, and design helper tools

Text & Writing206

Writing, cleanup, formatting, extraction, and text analysis tools

Developer & Web189

Developer utilities, networking, web debugging, and automation helpers

Conversion & Encoding172

Format, file, archive, unit, and encoding conversion tools

Excel Formula Engineering

Absorbance Quantification and Acid-Base Calculations

JSON Structure Surgery

Tabular Data Cleanup, Shaping, and Normalization

Professional Assembly of an Excel Workbook

Docs Pricing About Terms of Service Privacy Policy Contact

Document Tools

NATO Phonetic and ICAO Spelling Card Builder

Expand text into ICAO, ITU or ARRL spelling words and download a printable PDF card

Geography

MVT Mapbox Vector Tile PMTiles Google MVT Projection and Tilelive Encoding Auditor

Audit .mvt/.pbf vector tiles and PMTiles v3 archives against the Mapbox Vector Tile Specification 2.x: protobuf Layer/Feature/Value decoding, MoveTo/LineTo/ClosePath command-stream validation, ring winding and tag indexes, Web Mercator Google-tile XYZ bounds, PMTiles v3 directory decoding and tile-size vs feature-count budgets.

Science & Education

Nernst Equation Calculator

E = E⁰ − (RT/nF)·lnQ at any temperature, with the thermal factor RT/F, per-decade step 2.303RT/nF, and ΔG = −nFE.

Document Tools

OCR PDF to Structured JSON Bridge

Extract the PDF text layer with geometry (lines by y-position, tables by column gaps, headings by font size, colon key-value pairs), then fill a user-supplied JSON Schema field by field — labels matched by normalized keys, values coerced to declared types and validated with ajv.

Math & Numbers

Numerical Differentiation Calculator (f′(x))

Forward, backward, and central finite differences for f′(x₀) plus the central second derivative, with optional per-method error against the exact derivative.

Math & Numbers

Simpson's Rule Integrator (∫f(x)dx)

Composite Simpson's 1/3 rule for ∫f(x)dx (even n): node table with weights, integral estimate, optional exact value, O(h⁴) accuracy.

Math & Numbers

Trapezoidal Rule Integrator (∫f(x)dx)

Composite trapezoidal rule for ∫f(x)dx: node table, integral estimate, optional exact value and O(h²) error report.

Format Conversion

Markdown ⇄ AsciiDoc Converter

Bidirectional converter between GitHub-Flavored Markdown and AsciiDoc — headings, tables, code blocks, admonitions, links, task lists and more, with side-by-side output and conversion notes.

Science & Education

NMR / IR Spectroscopy Peak Predictor

Predict characteristic ¹H / ¹³C NMR shifts and IR bands from the functional groups you select — annotated simulated spectrum, carbonyl discrimination table, every peak explained.

Health

Lotka–Volterra Interspecific Competition Simulator

RK4 simulation of two competing species with phase plane, isoclines, equilibrium, and automatic outcome classification.

Health

Lotka–Volterra Predator-Prey Dynamics Simulator

RK4 simulation of the classic predator–prey oscillator with phase plane, closed orbits, equilibrium, and period analysis.

Health

Mark-Recapture Population Estimate (Lincoln–Petersen & Chapman)

Closed-population size from n₁ marked, n₂ caught, m₂ recaptured: Lincoln–Petersen and Chapman estimates with SE and 95% CI.