Tools & Calculators
Free developer and utility tools for everyday tasks. No signup, no tracking — everything runs entirely in your browser.
Calculators
6 toolsCompound Interest Calculator
See how your money grows over time with compound interest. Enter principal, rate, frequency, and time — get a full year-by-year breakdown.
BMI Calculator
Calculate your Body Mass Index instantly. Supports both metric (kg/cm) and imperial (lbs/ft) units. WHO standard weight categories included.
Percentage Calculator
Three calculation modes: find X% of a number, calculate what percentage X is of Y, or compute the percentage change between two values.
Loan Calculator
Calculate monthly payments, total interest, and the full amortization schedule for any loan — mortgage, car loan, personal loan, or student loan.
Age Calculator
Calculate your exact age in years, months, and days. Find out how many days until your next birthday and what day of the week you were born.
Inflation Calculator
Find out what a past amount is worth in today's money, or project future purchasing power using a custom inflation rate.
Developer Tools
12 toolsJSON Formatter & Validator
Format, validate, minify, explore as interactive tree, query with JSONPath, and generate TypeScript interfaces. The most complete JSON tool online.
URL Encoder / Decoder
Encode special characters for safe URL transmission or decode percent-encoded strings back to plain text. Parses query string parameters automatically.
Base64 Encoder / Decoder
Encode any text to Base64 or decode a Base64 string back to plain text. Supports URL-safe mode and image data URI preview.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates. World clock for 12 timezones, landmark timestamp reference, and live current timestamp.
Hex ↔ RGB Color Converter
Convert hex to RGB, HSL, and back. WCAG contrast ratio (AA/AAA), color harmonies, and live preview.
Regex Tester
Test regular expressions live. All matches highlighted, groups shown, visual pattern breakdown, and built-in regex flags support.
Text Diff Checker
Paste two blocks of text and get an instant line-by-line diff. Added lines in green, removed in red. Download as .patch file.
Markdown Preview
Write Markdown and see a live rendered preview side by side. Syntax highlighting, theme toggle, and HTML export.
Image Cropper
Crop and resize images online with a drag-to-select canvas. Lock aspect ratios (1:1, 16:9, 4:3), flip, rotate, and download as PNG, JPEG, or WebP. Fully private — no upload.
Color Contrast Checker
Check foreground/background color contrast ratios for WCAG 2.1 AA and AAA compliance. Live preview, HSL/RGB info, and preset accessible color combinations.
Timezone Converter
Live world clocks for 40+ cities. Compare multiple time zones side by side, convert any datetime across zones, and detect DST automatically.
SVG Viewer
Preview SVG files instantly by dropping or pasting code. Switch backgrounds (white/dark/transparent), zoom, edit source with syntax highlighting, and download.
Text Tools
5 toolsText Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case, UPPER CASE, lower case, Title Case, and Sentence case instantly.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time. Platform limits for Twitter, Instagram, SMS, and meta tags shown as progress bars.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words. Start with the classic Lorem ipsum or generate fully random placeholder text.
URL Slug Generator
Convert any title or text to a clean, SEO-friendly URL slug. Supports accented characters, custom separators, and multiple case formats.
String Utilities
Reverse text, sort lines, remove duplicates, shuffle, add/remove line numbers, trim whitespace, and count line occurrences — all in one place.
Dev & Data Tools
5 toolsUUID / GUID Generator
Generate RFC 4122 UUID v4 using cryptographically secure random values. Bulk generate up to 100 UUIDs, copy as list, CSV, or JSON array.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hash values simultaneously. All algorithms shown side by side with one-click copy.
JWT Decoder
Decode JWT tokens instantly. View header, payload, and signature with syntax highlighting. Check expiration time and all claims.
YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML bidirectionally. Handles nested objects, arrays, and all common YAML syntax without any library.
JSON ↔ CSV Converter
Convert JSON arrays to CSV with custom delimiters and header control. Flatten nested objects with dot notation. Download as .csv file.
Code Formatters
5 toolsHTML Formatter & Beautifier
Format and beautify HTML code with proper indentation. Handles inline tags, self-closing tags, and minify mode for production.
CSS Formatter & Beautifier
Format, beautify, and minify CSS code. Each selector and property on its own line with proper spacing. Supports media queries.
SQL Formatter & Beautifier
Format SQL queries with proper indentation and keyword casing. Supports SELECT, INSERT, UPDATE, DELETE, CREATE, and JOIN clauses.
XML Formatter & Validator
Format and validate XML with proper indentation. Shows element count, depth, and precise validation error messages.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities and decode them back. Supports named entities, numeric references, and extended ASCII.
Number & Math
5 toolsNumber Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal simultaneously. Shows bit groups, ASCII character, and quick examples.
Number Formatter
Format numbers as standard, European, scientific, engineering, compact (K/M/B), words, percentage, and currency — all at once.
Aspect Ratio Calculator
Find missing dimensions, resize by percentage, and match common ratios (16:9, 4:3, 1:1, 9:16). Includes a live shape preview.
Roman Numeral Converter
Convert Arabic numbers to Roman numerals and back (1–3999). Shows step-by-step breakdown, quiz mode, and year converter.
Byte / Bit Unit Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB. Shows both decimal (SI) and binary (IEC) units simultaneously.
Network & Security
5 toolsPassword Generator
Generate strong, cryptographically secure passwords. Customize length (8–128), character sets, and see entropy-based strength meter.
Cron Expression Parser
Parse cron expressions into human-readable descriptions and see the next 10 execution times. Visual builder for all 5 cron fields.
IP Subnet Calculator
Calculate network address, broadcast, host range, subnet mask, and wildcard for any IPv4 CIDR. Subnet divider and reference table included.
Morse Code Translator
Translate text to Morse code and back. Play audio via Web Audio API with speed control and synced visual dot-dash indicators.
Date Calculator
Calculate date differences (total + working days), add/subtract days from any date, and get detailed info about any date — week number, quarter, and more.
Visual & Design
5 toolsColor Palette Generator
Generate monochromatic, complementary, triadic, analogous, and split-complementary palettes from any base color. Export as CSS, SCSS, or JSON.
CSS Gradient Generator
Create linear, radial, and conic CSS gradients visually. Add up to 8 color stops, adjust angles, and copy the CSS code instantly.
Random Number Generator
Generate random numbers in any range. Roll dice (d4–d100), pick lottery numbers, shuffle lists, and generate unique sets.
Markdown Table Generator
Build Markdown tables visually with a click-to-edit grid. Import from CSV/TSV (Excel paste), set alignment per column, and copy instantly.
OG Tag / Meta Preview
Preview how your page looks on Google, Twitter/X, Facebook, LinkedIn, and Slack. Live social card preview with character limit warnings.
All 48 tools are free and run entirely in your browser. No data is stored or sent to any server.