Calculate trapezoid area, perimeter, legs, and midline from parallel bases, perpendicular height, and horizontal offset, or use centered isosceles mode.

Calculators & Converters

Regular Polygon Calculator

Calculate a regular polygon’s area, perimeter, apothem, circumradius, side length, angles, and diagonal count for 3 to 1,000 sides.

Calculators & Converters

Coordinate Distance Calculator

Calculate straight-line distance, midpoint, coordinate differences, and squared distance between Cartesian points in 2D or 3D, with an XY diagram.

Calculators & Converters

Paint Calculator

Estimate paint gallons or liters, whole containers and material cost from wall dimensions, coats, openings and your paint label coverage.

Calculators & Converters

Wallpaper Calculator

Calculate wallpaper rolls from full-height drops, actual roll dimensions, trim, straight pattern repeat and an editable extra allowance.

Calculators & Converters

Tile Calculator

Estimate floor or wall tile quantities, whole boxes, waste and material cost from actual tile dimensions and measured surface area.

Calculators & Converters

Flooring Calculator

Calculate flooring packs, cutting allowance, purchased coverage and material cost for rectangular, circular or ring-shaped floor areas.

Calculators & Converters

Concrete Calculator

Estimate concrete bags by mixed yield, cubic yards or meters, and rounded bulk orders for solid slabs and cylinders.

Calculators & Converters

Gravel Calculator

Estimate gravel bags, cubic yards or meters, and tons from ground shape, layer depth, allowance and supplier-entered bulk density.

Calculators & Converters

Mulch Calculator

Calculate mulch bags and bulk volume for beds and tree rings, with new-layer depth, exclusions and optional bag-versus-bulk cost.

Calculators & Converters

Soil Calculator

Calculate soil bags or bulk fill from internal raised-bed dimensions, target and existing depths, bed count and settlement allowance.

Calculators & Converters

Decking Calculator

Estimate straight decking stock boards from board direction, actual face width, side gaps, stock length and spare allowance.

Calculators & Converters

Wall Stud Calculator

Count wall stud pieces, manual framing extras and stock lumber for identical straight sections using user-specified on-center spacing.

Calculators & Converters

Loan Calculator

Calculate a fixed monthly loan payment, total interest, and a downloadable month-by-month repayment schedule.

Calculators & Converters

Amortization Calculator

Compare standard loan amortization with extra monthly principal payments, interest savings, and a CSV schedule.

Calculators & Converters

Savings Goal Calculator

Find the monthly deposit needed for a savings target, with contribution timing, zero-rate handling, and a CSV schedule.

Calculators & Converters

Compound Interest Calculator

Project compound growth with monthly contributions, compounding frequency, deposit timing, and a downloadable balance schedule.

Calculators & Converters

Simple Interest Calculator

Solve simple interest, principal, annual rate, or elapsed time, with optional 360- or 365-day year conventions.

Calculators & Converters

Credit Card Payoff Calculator

Estimate payoff months and interest for a fixed card payment, or find the payment for a chosen payoff target.

Calculators & Converters

Debt Payoff Calculator

Compare avalanche and snowball debt payoff scenarios with fixed minimums, rolled-over payments, milestones, and CSV exports.

Calculators & Converters

Savings Withdrawal Calculator

Simulate monthly savings withdrawals, yearly increases, growth or losses, and depletion within a chosen horizon.

Calculators & Converters

Investment Return Calculator

Calculate total, annualized, and inflation-adjusted investment returns from initial value, ending value, income, and fees.

Calculators & Converters

Inflation Calculator

Project inflation effects with a chosen rate or compare user-supplied price indexes to calculate equivalent cost and purchasing power.

Calculators & Converters

Sales Tax Calculator

Add or extract entered sales tax with a reconciled receipt breakdown.

Calculators & Converters

Discount Calculator

Compare stacked discounts, coupon order and a final tax scenario.

Calculators & Converters

Tip Calculator

Choose a tip base, round up and divide the final bill exactly.

Calculators & Converters

Split Bill Calculator

Split item totals or weighted shares with exact penny allocation.

Calculators & Converters

Profit Margin Calculator

Compare gross margin, operating margin and target revenue.

Calculators & Converters

Markup Calculator

Price from markup or margin and see actual unit profit.

Calculators & Converters

Break-Even Calculator

Compare break-even units and profit targets with sales capacity.

Calculators & Converters

Unit Price Calculator

Compare package sizes and multipacks in compatible units.

Calculators & Converters

Commission Calculator

Model flat or marginal commission, base pay and a threshold bonus.

Calculators & Converters

Freelance Rate Calculator

Estimate rates from income goals and realistic billable capacity.

Calculators & Converters

Date Difference Calculator

Count elapsed or inclusive calendar days and whole weeks between dates.

Time & Date

Date Add and Subtract Calculator

Shift dates by years, months, weeks, and days with clear month-end rules.

Time & Date

Business Days Calculator

Count or move working dates with your own weekends and holiday list.

Time & Date

Day of Year Calculator

Convert calendar dates and ordinal days, with leap-year validation.

Time & Date

ISO Week Number Calculator

Convert ISO week dates and calendar dates across week-year boundaries.

Time & Date

Leap Year Calculator

Check century exceptions and list leap years in an inclusive range.

Time & Date

Printable Calendar Generator

Print month or year calendars and download a clean A4 PDF.

Time & Date

Age Calculator

Find calendar age, total days, and the next birthday with a leap-day policy.

Calculators & Converters

Unix Timestamp Converter

Convert Unix seconds, milliseconds, and explicitly offset ISO date-times.

Time & Date

Time Zone Converter

Convert IANA wall times with explicit DST overlap and gap handling.

Time & Date

Stopwatch

Measure elapsed time, record lap splits, and export cumulative lap times to CSV.

Time & Date

Pomodoro Timer

Build a focus and break schedule with editable work sessions and automatic phase changes.

Time & Date

Interval Timer

Create a repeated sequence of named intervals with pause, progress, and a CSV schedule.

Time & Date

Countdown to Date

Count down to an event in a chosen time zone, including daylight saving gap and overlap handling.

Time & Date

Time Duration Calculator

Add and subtract durations, apply a multiplier, and inspect running totals in hours, minutes, and seconds.

Time & Date

Decimal Hours Converter

Convert decimal hours and durations with explicit increment rounding and adjustable display precision.

Time & Date

World Clock

View selected live time-zone clocks with dates, current UTC offsets, and downloadable snapshots.

Time & Date

Lap Time Calculator

Analyze individual lap times or cumulative splits with fastest laps, equal-distance pace, and CSV export.

Time & Date

Playback Speed Calculator

Calculate video or audiobook time at a speed, or find the speed needed to fit a time window.

Time & Date

Reading Time Calculator

Estimate silent reading and read-aloud time from text or word counts with custom speeds and paragraph pauses.

Text & Writing

Text Diff Checker

Align insertions and deletions between two plain-text versions.

Text & Writing

Duplicate Line Remover

Choose which repeated lines survive and audit their frequencies.

Text & Writing

Line Sorter

Sort lists naturally, alphabetically, numerically, or by length.

Text & Writing

Line Numberer

Add configurable reference numbers to pasted lines.

Text & Writing

Find and Replace Text

Preview literal or regex replacements in a bounded search worker.

Text & Writing

Word Frequency Counter

Inspect repeated words, percentages, and exportable counts.

Text & Writing

Text Reverser

Reverse grapheme clusters, words, or complete lines.

Text & Writing

Text to Slug Converter

Format titles as ASCII or Unicode URL path segments.

Text & Writing

Acronym Generator

Build traceable initials from your phrase and omit list.

Text & Writing

Word Wrap Tool

Insert line breaks with word-aware or grapheme-safe wrapping.

Text & Writing

Base64 Encoder & Decoder

Convert UTF-8 or raw bytes with strict Base64 and Base64url validation.

Developer Tools

URL Encoder & Decoder

Percent encode text for URL components, form values, and complete URIs.

Developer Tools

HTML Entity Encoder & Decoder

Escape HTML text or safely decode named and numeric references.

Developer Tools

Unicode Escape Converter

Convert Unicode text to UTF-16 or code-point escapes and back.

Developer Tools

ASCII Table

Inspect every ASCII value with numeric forms and control descriptions.

Developer Tools

Text to Binary Converter

Convert UTF-8 text to eight-bit bytes and inspect the binary.

Developer Tools

ROT13 Encoder & Decoder

Encode or decode clues and spoilers with the 13-letter substitution.

Text & Writing

Caesar Cipher Encoder & Decoder

Shift letters, inspect alphabet mappings, and compare all rotations.

Text & Writing

Hash Generator

Calculate local SHA-2 hashes for text, encoded bytes, and files.

Developer Tools

HMAC Generator

Create local HMAC tags with explicit key and message encodings.

Developer Tools

XML Formatter

Validate and format XML locally while preserving mixed content, CDATA, comments, and namespace declarations.

Developer Tools

YAML Formatter

Normalize YAML 1.2 data with precise numeric tokens, sorted keys, block or flow style, and bounded alias expansion.

Developer Tools

JSON Schema Generator

Infer a JSON Schema Draft 2020-12 from sample JSON, including nullable values, optional fields, and heterogeneous arrays.

Developer Tools

JSON / YAML Converter

Convert JSON and YAML locally while preserving long integers and decimal precision and rejecting unsupported YAML values.

Developer Tools

XML / JSON Converter

Convert XML to an ordered JSON tree and back, preserving mixed content, attributes, namespaces, comments, and text values.

Developer Tools

CSV Viewer

Inspect CSV in a paginated table, search individual columns, profile missing values, and export filtered records locally.

Developer Tools

TSV / CSV Converter

Convert tab-separated and comma-separated records with quote-aware parsing, multiline fields, BOM options, and local exports.

Developer Tools

CSV Column Extractor

Select and reorder CSV columns with a header-aware preview, quote-safe export, and no numeric type conversion.

Developer Tools

CSV Deduplicator

Remove duplicate CSV records by selected key columns, keep the first or last occurrence, and preview removed records.

Developer Tools

CSV Sorter

Sort CSV by up to three columns with exact decimal comparisons, stable ties, ascending or descending order, and blank placement.

Developer Tools

Regex Tester

Test JavaScript regex matches and capture groups in a timed worker.

Developer Tools

JWT Decoder

Inspect unverified JWT headers, payloads, and embedded UTC dates.

Developer Tools

UUID Generator

Generate random UUIDv4 or timestamp-prefixed UUIDv7 batches.

Developer Tools

ULID Generator

Generate compact ULIDs and inspect their embedded timestamps.

Developer Tools

Password Generator

Create unbiased random passwords with transparent entropy estimates.

Developer Tools

Robots.txt Generator

Build crawler path rules and sitemap entries for robots.txt.

Developer Tools

Meta Tag Generator

Create escaped page metadata and Open Graph website tags.

Developer Tools

UTM Builder

Build encoded campaign URLs while preserving other parameters.

Developer Tools

Redirect Rule Generator

Create exact-path Apache and Nginx redirect snippets.

Developer Tools

HTTP Status Code Reference

Search 36 selected HTTP response codes and practical examples.

Developer Tools

Contrast Checker

Check WCAG color contrast with transparency and live text previews.

Images & Design

Color Converter

Convert sRGB HEX, RGB, and HSL colors with alpha and precise output.

Images & Design

CSS Gradient Generator

Create linear, radial, and conic gradients with editable color stops.

Images & Design

Box Shadow Generator

Build layered CSS shadows with inset, spread, color, and blur controls.

Developer Tools

Border Radius Generator

Sculpt rounded corners and elliptical shapes with a live CSS preview.

Developer Tools

CSS Clamp Calculator

Calculate fluid CSS sizes from viewport endpoints with a live size chart.

Developer Tools

CSS Triangle Generator

Create directional border triangles with precise size and apex controls.

Developer Tools

Flexbox Playground

Explore flex layout, wrapping, alignment, and individual item sizing.

Developer Tools

CSS Grid Generator

Design fixed and responsive CSS grids with spans and weighted columns.

Developer Tools

CSS Animation Generator

Build keyframe animations with playback controls and reduced motion CSS.

Developer Tools

Image Compressor

Reduce image dimensions and compare JPEG, PNG, and WebP file sizes locally.

Images & Design

Image Cropper

Crop a photo with pixel coordinates, common aspect-ratio presets, and a selection preview.

Images & Design

Image Rotator

Rotate images by 90 degrees or a custom angle with expanded canvas exports.

Images & Design

Image Flipper

Mirror images horizontally, vertically, or both, with local previews and downloads.

Images & Design

Image Format Converter

Convert raster images to PNG, JPEG, or WebP with quality and background controls.

Images & Design

Image to Base64

Encode a local raster image as a Base64 data URL, raw string, or HTML img snippet.

Images & Design

Base64 to Image

Decode and validate a raster image Base64 string, preview it, and download the original bytes.

Images & Design

Image Border Generator

Add solid-color inside or outside photo borders with pixel thickness controls.

Images & Design

Image Watermark

Add a text signature or raster logo watermark with opacity, size, and placement controls.

Images & Design

Photo Contact Sheet

Create a labeled photo grid with adjustable columns, cell sizes, margins, and export formats.

Images & Design

Favicon Generator

Create a lettermark or upload a logo, preview small icons, and download six PNG sizes plus a real multi-image ICO.

Images & Design

Social Image Resizer

Resize local images onto editable square, portrait, vertical, and landscape canvases with crop positioning and PNG or JPEG export.

Images & Design

SVG Wave Generator

Create layered sine-wave graphics with adjustable amplitude, cycles, colors, and SVG or PNG downloads.

Images & Design

SVG Blob Generator

Generate repeatable organic SVG shapes from a seed, point count, irregularity, and color, with transparent PNG export.

Images & Design

Checkerboard Generator

Make precise checkerboard images with configurable rows, columns, cell size, and colors, then download SVG or PNG.

Images & Design

Seamless Stripe Generator

Create repeating horizontal, vertical, or diagonal stripe tiles with editable colors, widths, and SVG or PNG downloads.

Images & Design

Color Blindness Simulator

Compare color palettes and local images using cited Machado-model simulations in linear sRGB, with honest limits and PNG export.

Images & Design

Image to ASCII

Turn a local image into real character art with adjustable columns, character aspect ratio, ramps, and safe TXT or HTML exports.

Images & Design

Pixel Art Editor

Draw real pixel art with pencil, eraser, flood fill, palette colors, undo and redo, and transparent PNG export.

Images & Design

Sprite Sheet Generator

Combine local rasters into a transparent PNG sprite sheet and download exact frame coordinates as JSON or a ZIP.

Images & Design

Lined Paper Generator

Make printable ruled paper with custom line spacing, headings, and writing margins.

Puzzles & Printables

Handwriting Paper Generator

Print handwriting practice paper with top lines, dashed midlines, and emphasized baselines.

Puzzles & Printables

Music Staff Paper Generator

Print blank five-line music staves with adjustable spacing, paired systems, and measure divisions.

Puzzles & Printables

Hex Paper Generator

Create flat-top or pointy-top hexagonal paper with optional cell labels and precise side lengths.

Puzzles & Printables

Coordinate Grid Generator

Print numbered Cartesian coordinate grids with equal axes, arrowheads, and first-quadrant options.

Puzzles & Printables

Multiplication Worksheet Generator

Generate unique multiplication questions, missing-factor exercises, and numbered printable answer keys.

Puzzles & Printables

Arithmetic Worksheet Generator

Build mixed arithmetic worksheets with bounded operands, exact division, and printable answer keys.

Puzzles & Printables

Fraction Worksheet Generator

Make fraction operation worksheets with denominator bounds and fully reduced answer keys.

Puzzles & Printables

Flashcard Maker

Turn your front-and-back notes into printable foldable or duplex flashcards across multiple pages.

Puzzles & Printables

Maze Generator

Generate seeded solvable mazes with print-size previews and a separate solution page.

Puzzles & Printables

Random Number Generator

Generate unbiased random integers in an inclusive range, with unique batches, sorting, recent history, and text export.

Random Generators

Playing Card Shuffler

Shuffle a standard 52-card deck, optionally add two jokers, and draw hands without replacement with draw history and export.

Random Generators

Bingo Number Caller

Call random bingo numbers without repetition, with 75-ball BINGO or 90-ball numeric formats, a visible callboard, history, and export.

Random Generators

Coin Flipper

Flip one fair virtual coin or a batch of up to 1,000, with heads and tails totals, session percentages, recent history, and export.

Random Generators

Decision Wheel

Spin an equal-chance wheel for 2–40 unique options, with an accessible result, reduced-motion support, recent history, and text export.

Random Generators

Random Date Generator

Generate random calendar dates in an inclusive 1900–2100 range, with weekday filtering, unique batches, chronological sorting, and text export.

Random Generators

Random Time Generator

Pick random UTC clock slots within a range, including optional midnight crossing, configurable time steps, unique batches, and text export.

Random Generators

Random Color Generator

Generate uniform random 24-bit sRGB colors with hex and RGB swatches, optional uniqueness, CSS custom properties, and text export.

Random Generators

Random Coordinate Generator

Generate equal-area random latitude and longitude points globally or inside a bounding rectangle, with decimal-degree results and text export.

Random Generators

Secret Santa Generator

Create local Secret Santa assignments with no self-matches, directed exclusions, matching diagnostics, private-by-default reveal, and optional organizer export.

Random Generators