By intent

Tools by what you want to do.

Calculate, convert, analyze, optimize, or build. Five verbs that cover the work most people come here to do.

The same tool can show up under more than one verb because the same operation can serve more than one intent. A color converter is a Convert tool when you have a HEX value and need RGB, and an Analyze tool when you want to know whether a brand color passes WCAG contrast against white. The action view keeps the tool in both places so the path that matches your intent is always the shorter one.

The verbs themselves are intentionally narrow. Calculate is for inputs that produce numbers. Convert is for transformations with no information loss. Analyze is for verdicts and measurements. Optimize is for search against an explicit objective. Build is for artifacts you take away. When a tool does not fit any of the five, it sits in More rather than getting forced into a verb that does not describe it.

If you already know the domain you are working in, the category index is usually faster than this page. The action view earns its place when you are not sure which category a problem belongs to, or when the tool you want exists across several categories under different names.

🧮

Calculate

Perform mathematical computations, financial calculations, and numerical analysis. From simple arithmetic to complex formulas, get instant results for business, science, and everyday calculations.

🔄

Convert

Transform data between different formats, units, and representations. Convert text, encoding, time zones, measurements, and file formats with precision and ease.

🔍

Analyze

Examine and interpret data, text, and patterns to gain insights. Validate formats, detect patterns, assess performance, and understand complex information structures.

⚡

Optimize

Enhance performance, improve efficiency, and maximize results. Optimize content for SEO, streamline processes, reduce resource usage, and achieve better outcomes.

🔨

Build

Create and generate new content, code, and solutions. Build documents, generate passwords, construct schemas, and develop custom solutions from scratch.

When to use each action

What each verb actually means here.

Calculate

Calculate covers the tools whose job is a number in, a number out. Most are closed-form formulas drawn from standard published sources: time-value-of-money equations for the finance tools, BMI and BMR for the health tools, area and volume for the math and construction tools, optical formulas for the photography tools. The calculation runs in your browser, so you can change an input and watch the result move without a network round trip.

When to use it. Reach for Calculate when you already know which numbers you have and you want the corresponding answer. If you are still figuring out which numbers matter, the per-category index will get you there faster than the action view.

Representative tools

401k Calculator - Future-value-of-an-annuity projection with employer match, salary growth, and inflation adjustment over a full retirement horizon.
BMI Calculator - Adult BMI plus child and teen percentile lookup against CDC growth charts.
Mortgage Calculator - Monthly payment, full amortization schedule, and total interest paid for fixed-rate mortgages.
Compound Interest Calculator - Continuous, monthly, quarterly, or annual compounding with optional regular contributions.
Days Between Dates Calculator - Inclusive and exclusive day counts, workdays-only mode, and span breakdown.
Square Footage Calculator - Rectangular, triangular, and circular areas with unit conversion in one form.

Browse the full set under Calculate tools.

Convert

Convert covers anything that turns one representation into another with no information lost: units, formats, encodings, color spaces, time zones, data shapes. The arithmetic is usually simple. The hard part is handling the inputs gracefully (fractions, mixed units, comma-separated lists, malformed JSON) so the tool gives a useful answer instead of an error.

When to use it. Reach for Convert when the input and output mean the same thing in different forms. If you are reshaping data with judgment calls about what to keep, that is closer to Analyze or Optimize.

Representative tools

Color Converter - HEX, RGB, HSL, HSV, and CMYK with auto-format detection on input.
CSV to JSON Converter - Header detection, type inference for numeric and boolean columns, pretty-printed output.
Cooking Conversion Calculator - Cups, ounces, grams, and milliliters with ingredient-specific densities.
Base64 Decode and Encode - Bidirectional encoding with URL-safe variant and file input support.
Leather Thickness Converter - Ounces, millimeters, inches, and irons with weight-class and project suggestions.
UTC to PST Time Converter - Daylight-saving aware conversion with side-by-side hour grid.

Browse the full set under Convert tools.

Analyze

Analyze tools take an input that is already in the right format and tell you something useful about it: readability score for a block of text, structural validity for a JSON document, network details for an IP address, character and word counts against a target. The output is judgment-relevant rather than a literal answer.

When to use it. Reach for Analyze when you want a verdict, a measurement, or a structural report on something you already have. If you want to change the input to improve the verdict, follow up with an Optimize tool.

Representative tools

Word Counter - Words, characters, sentences, paragraphs, syllables, Flesch reading score, and reading time in one pass.
JSON Validator and Formatter - Strict parser with line-and-column error pointing, plus a pretty-printer.
What Is My IP Analyzer - Public IP, reverse DNS, geo lookup, and ASN in one panel.
Meta Title and Description Length Checker - Pixel-width measurement (not just character count) so the result matches what Google actually truncates.
Average Calculator - Arithmetic, geometric, and harmonic means plus median, range, and quartiles.
Token Calculator - GPT-family token counts for cost estimation and context-window planning across common models.

Browse the full set under Analyze tools.

Optimize

Optimize tools take an input that already works and search for a better version against a stated objective. The objectives are explicit: a SEO keyword density, a meta-title length target, an employer-match contribution percentage that maxes out the match without exceeding the IRS cap, a prompt chain that produces a target output with fewer steps.

When to use it. Reach for Optimize when you have a working answer and want a better one against a measurable goal. The tools surface the trade-offs explicitly so the choice stays with you.

Representative tools

Keyword Optimizer - Density, prominence, and co-occurrence scoring against a target keyword list.
401k Matching Strategy Calculator - Finds the contribution percentage that fully captures the employer match without overshooting the IRS limit.
Product Listing Optimizer - Scores title, bullets, and description against marketplace character limits and feature coverage.
Packing Efficiency Calculator - Volume utilization and dimensional weight for cartons of mixed-size items.
Prompt Chain Tool - Construct and refine multi-step prompts, copy as JSON or plain text, measure token cost per step.
Whitespace Formatter Tool - Normalizes inconsistent indentation and blank-line spacing so downstream tools work cleanly.

Browse the full set under Optimize tools.

Build

Build tools generate new artifacts from your inputs: a password, an invoice, a barcode label, a JSON schema, an icon file, a block of placeholder text. The output is a file or a string you take away with you and use elsewhere, not a number to read on the page.

When to use it. Reach for Build when you need an artifact to use somewhere else. The tools focus on producing clean, immediately usable output (correctly-encoded files, copy-paste-safe text, valid syntax) rather than helping you decide what to build.

Representative tools

Password Generator - Cryptographically random passwords with configurable length, character classes, and pronounceability.
Invoice Generator - Line items, taxes, discounts, PDF export, and a saveable seller profile.
Barcode Label Generator - Code 128, EAN, UPC, and QR codes with bulk CSV input and print-ready layout.
JSON Schema Stripper - Strips example, default, and description fields so a schema fits in a model context window.
ICO Converter - Multi-resolution ICO files for favicons and Windows desktop icons.
Dummy Text Generator - Lorem ipsum, English filler, and themed dummy text with adjustable paragraph and sentence counts.

Browse the full set under Build tools.