Tools catalogue

Tools

Tools for all your nerdy needs! From calculators to cryptography, we've got you covered.

Accessibility

2 tools

Check user-facing accessibility details such as contrast, readable text, and inclusive interface copy before publishing.

Accessible Name Tester

Trace labels, aria-labelledby, aria-label, alt text, title text, and described-by clues for accessible names locally.

Alt Text Coverage Checker

Check pasted HTML for missing, empty, filename-like, or generic image alt text before publishing.

Calculate

4 tools

Estimate market capitalization and holdings value from supply and price inputs.

CIDR Calculator

Calculate IPv4 CIDR network address, broadcast address, subnet and wildcard masks, host range, and usable hosts.

Market Cap Calculator for Supply, Price, and Holdings

Calculate market cap from supply and unit price, then estimate holdings value.

Percentage Calculator for Percent Of, Change, and Increase

Calculate percent-of, percent-change, percent-of-total, and increase/decrease values with a formula breakdown.

Unix Timestamp Converter

Convert Unix timestamps to UTC, local, and ISO dates.

Convert

56 tools

Encode, decode, and convert text, data, Roman numerals, and measurement units across Base formats, HTML, Markdown, JSON, XML, data size, angle, energy, power, torque, length, weight, area, volume, cooking measures, temperature, speed, and pressure.

Angle Converter

Convert angles across degrees, radians, turns, gradians, arcminutes, arcseconds, and milliradians with formulas, tables, CSV output, and copy-ready results.

Area Converter

Convert area units across square metric, US customary, acre, hectare, and square mile measurements with formulas, tables, CSV output, and copy-ready results.

Base100 Emoji Encoder And Decoder

Encode and decode Adam Niederer's Base100 emoji format locally in your browser.

Base122 Encoder And Decoder

Encode and decode Kevin Albertson's experimental Base122 format locally in your browser.

Base16 Encoder and Decoder

Encode and decode Base16 text using an online tool.

Base2048 Encoder And Decoder

Encode and decode Base2048-style Unicode text locally in your browser.

Base32 Encoder and Decoder

Encode and decode Base32 text using an online tool.

Base32768 Encoder And Decoder

Encode and decode qntm Base32768 text locally in your browser.

Base36 Encoder And Decoder

Encode and decode Base36 text locally in your browser.

Base4096 Encoder And Decoder

Encode and decode ZCHG canonical Base4096 text locally in your browser.

Base45 Encoder And Decoder

Encode and decode RFC 9285 Base45 text using an online tool.

Base58 Encoder And Decoder

Encode and decode Base58 text using an online tool.

Base58Check Encoder And Decoder

Encode and verify Bitcoin-style Base58Check strings with version bytes, payload hex, and double-SHA-256 checksums.

Base62 Encoder and Decoder

Encode and decode Base62 text using an online tool.

Base64 Encoder And Decoder

Encode and decode Base64 text using an online tool.

Base64URL Encoder And Decoder

Encode and decode Base64URL text using an online tool.

Base65536 Encoder And Decoder

Encode and decode qntm Base65536 text locally in your browser.

Base85 Encoder and Decoder

Encode or decode Base85 text in your browser with Adobe Ascii85, plain Ascii85, RFC 1924, and Z85 options, including Adobe wrappers and zero-block shorthand on decode.

Base91 Encoder And Decoder

Encode and decode Base91 text using an online tool.

Base92 Encoder And Decoder

Encode and decode Base92 text locally in your browser.

Bech32 Encoder And Decoder

Encode and decode Bech32 and Bech32m strings from HRP and payload hex.

Binary Encoder And Decoder

Convert UTF-8 text to binary byte octets and back online.

Cooking Measure Converter

Convert common recipe volumes and weights with ingredient-aware density assumptions, formulas, table or CSV output, and copy-ready results.

CSV to JSON Converter

Convert CSV rows to JSON objects or arrays with delimiter and header options.

CSV to TSV

Convert CSV to tab-separated values with delimiter, trimming, line-ending, file, report, and download options.

Data Size Converter

Convert data sizes across bits, bytes, decimal SI byte units, binary IEC byte units, and network-style bit units with formulas, tables, CSV output, and copy-ready results.

Decimal Encoder And Decoder

Encode and decode decimal byte values using an online tool.

Ecoji Encoder And Decoder

Encode text into a browser-local emoji alphabet, decode output from this tool, and see where it differs from canonical Ecoji V1 or V2 tools.

Energy Converter

Convert energy units across joules, watt-hours, calories, BTU, electronvolts, therms, and foot-pounds with formulas, tables, CSV output, and copy-ready results.

HTML Encoder And Decoder

Encode and decode HTML entities using an online tool.

HTML to Markdown Converter

Convert HTML snippets into Markdown for documentation, release notes, and content cleanup.

HTML to Plain Text

Convert HTML snippets into readable plain text with link, list, image alt text, and table-cell options.

JSON String Escape / Unescape

Escape and unescape JSON string literals with local, user-controlled conversion.

JSON to CSV Converter

Convert JSON arrays to CSV with delimiter, header, and line ending options.

JSON to XML Converter

Convert JSON to XML in your browser, turning objects and arrays into escaped XML elements with instant output, empty-input handling, and invalid JSON errors.

LEB128 Encoder And Decoder

Encode and decode LEB128 values using an online tool.

Length Converter

Convert lengths across metric, US customary, nautical, and astronomical units with formulas, tables, CSV output, and copy-ready results.

Markdown to HTML Converter

Convert Markdown snippets to HTML locally in your browser, with options for auto-links, task-list shortcuts, emoji shortcuts, new-window links, and complete HTML documents.

Markdown to Plain Text

Convert Markdown into readable plain text with link, list, table, code, and image-description options.

Multibase Encoder and Decoder

Encode and decode prefixed multibase strings with a focused browser tool.

Number Base Converter

Convert signed integers between bases 2 through 36 online.

Octal Encoder And Decoder

Encode and decode octal byte groups using an online tool.

Power Converter

Convert power units across watts, SI multiples, horsepower, BTU per hour, foot-pounds per second, and tons of refrigeration with formulas, tables, CSV output, and copy-ready results.

Pressure Converter

Convert pressure units across pascals, bar, atmospheres, torr, mercury-column references, PSI, and ksi with formulas, tables, CSV output, and copy-ready results.

Roman Numeral Converter

Convert decimal integers and Roman numerals from 1 through 3999 with validation, optional clock-face IIII input, place-value tables, JSON output, copy, and download actions.

Speed Converter

Convert speed and pace units across metric, imperial, nautical, and Mach reference values with formulas, tables, CSV output, and copy-ready results.

Temperature Converter

Convert Celsius, Fahrenheit, kelvin, Rankine, and Réaumur temperatures with absolute-zero validation, formulas, tables, CSV output, and copy-ready results.

Text Case Converter

Convert text into writing cases and code identifier cases locally in your browser.

Torque Converter

Convert torque units across newton-meters, pound-feet, pound-inches, ounce-inches, kilogram-force units, and dyne-centimeters with formulas, tables, CSV output, and copy-ready results.

TSV to CSV

Convert tab-separated values to CSV with delimiter, trimming, line-ending, file, report, and download options.

Unicode Base64 Encoder And Decoder

Encode and decode Unicode Base64 text using UTF-8.

URL Encoder / Decoder

Encode and decode URL components or full URLs locally in your browser.

Uuencode and Xxencode Encoder and Decoder

Encode and decode Uuencode and Xxencode text using an online tool.

Volume Converter

Convert volume measurements across metric, cubic, US liquid, and imperial units with formulas, tables, CSV output, and copy-ready results.

Weight Converter

Convert weight and mass units across metric, avoirdupois, carat, grain, stone, and ton measurements with formulas, tables, CSV output, and copy-ready results.

XML to JSON Converter

Convert XML to pretty-printed JSON locally in your browser with attribute, text, repeated-element, copy, and download support.

Cryptography

25 tools

Generate deterministic text digests with CRC, Keccak, MD, SHA, SHA-3, SHAKE, and Whirlpool hash tools.

CRC-16 Hash Generator

Calculate a CRC-16/ARC checksum from text and compare the four-character hex result.

CRC-32 Hash Generator

Calculate a CRC-32/ISO-HDLC checksum from text and compare the eight-character hex result.

CRC-64/XZ Checksum Generator

Calculate a CRC-64/XZ checksum from text and compare the 16-character uppercase hex result.

Keccak-224 Hash Generator

Create a 56-character Keccak-224 digest from text.

Keccak-256 Hash Generator

Generate a Keccak-256 hash of a string of text.

Keccak-384 Hash Generator

Generate a Keccak-384 hash of a string of text.

Keccak-512 Hash Generator

Generate a Keccak-512 hash of a string of text.

MD2 Hash Generator

Generate an MD2 hash of a string of text.

MD4 Hash Generator

Generate an MD4 hash of a string of text.

MD5 Hash Generator

Generate an MD5 hash of a string of text.

MD6 Hash Generator

Create a deterministic MD6-labeled comparison value for a string of text.

SHA-1 Hash Generator

Generate a SHA-1 message digest from text input.

SHA-224 Hash Generator

Generate a SHA-224 message digest from text input.

SHA-256 Hash Generator

Generate a SHA-256 hash of a string of text.

SHA-384 Hash Generator

Generate a SHA-384 message digest from text input.

SHA-512 Hash Generator

Generate a SHA-512 message digest from text input.

SHA-512/224 Hash Generator

Generate a SHA-512/224 hash of a string of text.

SHA-512/256 Hash Generator

Generate a SHA-512/256 message digest from text.

SHA3-224 Hash Generator

Generate a SHA3-224 digest from text locally in your browser.

SHA3-256 Hash Generator

Generate a SHA3-256 digest from text locally in your browser.

SHA3-384 Hash Generator

Generate a SHA3-384 digest from text locally in your browser.

SHA3-512 Hash Generator

Generate a SHA3-512 digest from text locally in your browser.

SHAKE-128 Hash Generator

Generate SHAKE-128 hashes locally from UTF-8 text, choose a whole-byte output length, and copy the uppercase hex digest for tests or identifiers.

SHAKE-256 Hash Generator

Generate SHAKE-256 hashes locally from UTF-8 text, choose a whole-byte output length, and copy the uppercase hex digest for tests or identifiers.

Whirlpool Hash Generator

Generate a standard Whirlpool digest from text locally in your browser.

Data

23 tools

Validate, profile, and prepare data-oriented schemas, queries, tables, and configuration files with clear browser-local feedback.

Compression Playground

Compress and decompress text or local files with gzip or zlib-wrapped deflate, compare byte sizes, export results, and keep data in the browser.

CSV Column Profiler

Profile CSV columns for blanks, distinct values, likely types, ranges, top values, and row-shape warnings.

CSV Deduplicator

Remove duplicate CSV rows by full-row or selected-column keys with first/last row controls and a removal report.

CSV Merge and Join

Join two CSV tables by matching key columns with left, inner, right, and full outer join modes.

CSV Pivot Table

Build local CSV pivot tables with row groups, optional column groups, totals, and count, numeric, distinct, first, or last aggregations.

CSV Sort and Filter

Sort and filter CSV rows by header names or column numbers with text, number, date, blank, and regular-expression controls.

CSV to Markdown Table

Convert CSV into GitHub-flavored Markdown tables with header, delimiter, alignment, line-break, preview, and report options.

CSV Transpose

Transpose CSV rows and columns locally with header labels, ragged-row padding, preview, report, copy, and download controls.

DKIM Record Builder and Inspector

Build and inspect DKIM TXT records locally with selector guidance, key checks, syntax warnings, and DNS wrapping preview.

DMARC Record Builder and Inspector

Build and inspect DMARC TXT records locally with policy presets, reporting destinations, alignment warnings, and DNS TXT output.

DNS Zone File Validator

Validate BIND-style DNS zone files locally with origin, TTL, line-level diagnostics, and normalized output.

Dotenv Validator

Validate, format, and compact .env configuration text locally.

HAR File Viewer and Analyzer

View HAR waterfalls, grouped domains, largest requests, and cache signals locally.

HTML Table to CSV

Convert HTML tables to CSV with table selection, delimiter, headers, captions, links, line breaks, merged-cell expansion, preview, and report options.

JSON Lines Formatter and Converter

Validate JSON Lines or NDJSON records and convert them to arrays locally.

JSON Schema Sample Generator

Generate example JSON from JSON Schema with options for optional fields, arrays, and formatted output.

JSON Schema Validator

Validate, format, and compact JSON Schema documents locally.

Markdown Table to CSV

Convert Markdown pipe tables into CSV with delimiter, line-ending, header, whitespace, preview, and warning report options.

SemVer Comparator and Range Tester

Compare SemVer versions, test common range syntax, inspect prerelease handling, and identify the highest matching upgrade locally.

SPF Record Builder and Inspector

Build copyable SPF TXT values and inspect SPF mechanisms, redirects, includes, and lookup-count risk locally in your browser.

SQL Insert Generator from CSV or JSON

Generate SQL INSERT statements from CSV or JSON rows with mapping, NULL handling, dialect, and batch options.

Table Column Renamer

Rename CSV or TSV headers by existing name or column number with duplicate handling, report, preview, copy, and download controls.

ZIP File Explorer and Unpacker

Open ZIP archives locally, inspect directory trees, preview text or image entries, and download selected files without uploading the archive.

Date & Time

12 tools

Compare dates, times, elapsed durations, and planning intervals with local browser-only calculators.

Age Calculator

Calculate age from birth date to an as-of date with optional times, leap-day handling, exact totals, and next-birthday planning.

Business Days Calculator

Count business days across date ranges and calculate future or past deadlines while skipping configured weekends and holidays.

Calendar Link Generator

Generate Google Calendar, Outlook, Yahoo, and iCalendar event links locally with date, time zone, location, guests, reminders, and .ics download support.

Date Add/Subtract Calculator

Add or subtract calendar and time amounts from a local date with configurable month-end handling and a readable result summary.

Date Time Difference Calculator

Calculate elapsed duration between two local dates with exact totals, calendar breakdowns, signed mode, and inclusive day counts.

Duration Converter

Convert durations across elapsed-time units with optional month and year assumptions, formulas, and a readable summary.

ISO 8601 Duration Calculator

Parse, build, normalize, estimate, and apply ISO 8601 durations with clear handling of weeks, calendar units, and local dates.

Moon Phase Calculator

Estimate Moon phase, lunar age, illumination, waxing or waning status, and upcoming quarter dates from a local date and UTC offset.

Sunrise Sunset Calculator

Estimate sunrise, sunset, solar noon, daylight duration, twilight variants, UTC times, and polar-day or polar-night edge cases.

Time Unit Converter

Convert time values across fixed and calendar-estimated units with formulas, tables, CSV output, and clear assumptions.

Timezone Meeting Planner

Plan a meeting across IANA time zones with local time conversion, day offsets, work-hours checks, and nearby slot suggestions.

Week Number Calculator

Find ISO week numbers, week-year boundaries, weekday numbers, week ranges, day-of-year values, and Jan 1 calendar week variants.

Developer

9 tools

Test patterns, compare text, and explain schedule expressions for developer workflows.

Cron Expression Parser

Explain five-field cron schedules with names, ranges, lists, and step values.

JSON Diff Checker

Compare two JSON documents locally and review added, removed, changed, or unchanged values by path.

JSONPath Tester

Evaluate common JSONPath selectors against JSON locally in your browser.

Line Tools

Sort, trim, deduplicate, reverse, and shuffle lines locally.

Query String Parser

Parse query strings into rows, JSON, or rebuilt encoded output.

Regex Tester

Test JavaScript regex patterns with flags, groups, and match positions.

Text Diff Checker

Compare two text blocks locally with a line-by-line diff.

URL Parser

Parse URLs into standard URL parts with masked credentials by default.

Word & Character Counter

Count words, Unicode characters, lines, paragraphs, and estimated reading time locally.

Design

8 tools

Convert colors and generate browser-friendly visual CSS values.

Accessible Color Pair Finder

Find accessible color pair suggestions that meet WCAG contrast targets locally.

Aspect Ratio Calculator

Calculate aspect ratios, missing dimensions, simplified ratio values, and fit checks locally in the browser.

Color Converter

Convert CSS colors between HEX, RGB/RGBA, and HSL/HSLA locally.

CSS Border Radius Generator

Generate compact border-radius CSS with linked corners, units, and a local preview.

CSS Box Shadow Generator

Generate single-layer box-shadow CSS with offsets, blur, spread, color, inset, and preview.

CSS Clamp Generator

Generate responsive CSS clamp() values with viewport ranges, rem-aware math, and copyable output.

CSS Gradient Generator

Generate CSS gradients with color stops, angle controls, and a local preview.

WCAG Contrast Checker

Check WCAG contrast ratios for text and UI color pairs locally.

Finance

14 tools

Estimate loan payments, payoff cost, and personal finance planning numbers locally in the browser.

APY APR Converter

Convert APY and APR with periodic or continuous compounding assumptions and a clear local breakdown.

Break-Even Calculator

Estimate break-even units, revenue, contribution margin, target profit volume, and margin of safety.

Compound Interest Calculator

Estimate compound growth with a starting balance, recurring contributions, earnings, and final value breakdown.

Crypto Position Size Calculator

Estimate crypto position size, risk amount, notional value, and leverage from entry and stop prices.

Dollar Cost Average Calculator

Estimate dollar-cost averaging purchases, average cost, units acquired, ending value, and lump-sum comparison locally.

Inflation Adjustment Calculator

Estimate inflation-adjusted value, amount change, and purchasing-power comparison from an amount, rate, and year range.

Loan Payment Calculator

Estimate fixed-rate loan payments, total interest, payoff date, and optional extra-payment savings.

Margin Markup Calculator

Calculate gross margin, markup, selling price, per-unit profit, and total gross profit from simple pricing inputs.

Mortgage Calculator

Estimate fixed-rate mortgage payments with down payment, taxes, insurance, HOA dues, and optional PMI.

ROI Calculator

Calculate total ROI, net gain or loss, annualized return, and break-even value from investment inputs.

Sales Tax Calculator

Estimate sales tax, taxable subtotal, tax-included amounts, discounts, shipping treatment, and checkout totals.

Savings Goal Calculator

Estimate recurring deposits, projected savings, and goal gaps with a local browser-only savings goal calculator.

Stock Average Calculator

Calculate weighted average stock cost, cost basis, position value, and optional next-buy impact locally.

Tip Calculator

Estimate gratuity, tip basis, bill total, optional fees, and even per-person splits from a local bill amount and tip rate.

Format

7 tools

Beautify CSS, HTML, INI, JavaScript, JSON, SQL, TOML, XML, and YAML into cleaner, easier-to-read text.

CSS Beautifier

Format messy or minified CSS into readable stylesheet text.

HTML Beautifier

Format and beautify HyperText Markup Language (HTML).

JavaScript Beautifier

Format messy or minified JavaScript into readable source text.

JSON Formatter

Format, minify, and validate JSON with local browser processing.

Markdown Previewer

Preview Markdown locally in your browser, render CommonMark and GitHub-flavored syntax, and inspect cleaned HTML output before copying drafts into another editor.

SQL Formatter

Format or minify SQL locally without executing queries.

XML Formatter / Validator

Validate, format, and minify XML locally with selectable indentation.

Generate

7 tools

Create lightweight generated content, including lorem ipsum placeholder copy, meta tags, QR codes, robots.txt, sitemap.xml, and repeatable pirate names.

Meta Tag Generator

Generate SEO, Open Graph, and Twitter/X card meta tags locally.

Pirate name generator

Generate pirate-inspired names for stories, games, parties, and tabletop characters.

QR Code Generator

Generate copyable SVG QR codes from text or URLs with error correction, quiet-zone, and module-size controls.

Robots.txt Generator

Generate review-ready robots.txt rules with sitemap, duplicate cleanup, and crawl-delay options.

Sitemap.xml Generator

Generate downloadable sitemap.xml from URL rows with optional sitemap metadata.

Slug Generator

Generate clean URL slugs from titles and labels with local browser options.

UUID v4 Generator

Generate RFC 9562 UUID v4 values locally with copy and text download options.

Network

2 tools

Inspect HTTP headers, validate network inputs, and prepare DNS or address-planning lookups.

DNS Lookup Command Generator for dig and nslookup

Generate dig and nslookup commands for DNS record lookups you run yourself.

Subnet Splitter

Split IPv4 CIDR blocks into equal-size child subnets with networks, ranges, masks, and CSV export.

Productivity

1 tool

Create practical business workflow identifiers, release drafts, social publishing checks, planning artifacts, and project setup files locally in the browser.

Calendar ICS Generator

Generate browser-local iCalendar .ics event files with time zone, guests, reminders, recurrence, and download support.

Security

4 tools

Decode security tokens, format key material, and generate local browser-only credentials.

AES Encrypt and Decrypt Playground

Encrypt and decrypt AES-GCM or AES-CBC examples locally with key, IV, tag, copy, export, and test-vector controls.

Bcrypt Hash Generator and Verifier

Generate and verify bcrypt password hashes locally with cost-factor guidance and copyable output.

JWT Decoder for Header, Payload, and Claims Viewer

Inspect JWT header, payload, and registered claims without signature verification.

Password Generator

Generate local random passwords with configurable character sets.

SEO

1 tool

Prepare crawler, sitemap, metadata, URL, and preview signals for search-friendly publishing workflows.

Article Schema Generator

Generate Article, BlogPosting, NewsArticle, or TechArticle JSON-LD from headline, author, publisher, image, and date fields.

Text

5 tools

Measure, inspect, and prepare text with browser-local writing and cleanup utilities.