Tools
All tools run entirely in your browser — no data is ever sent to a server. No account needed. Free to use, right now.
- All
- Text
- Security
- Encoding
- Developer
- Design
- Utility
Character Counter
Count characters, words, lines, and byte size in real time
Password Generator
Generate secure random passwords
Base64 Encode / Decode
Encode and decode Base64 in your browser
Image to Base64 (Data URL)
Encode image files to Base64 or a data URL for CSS / HTML inline embedding
URL Encode / Decode
Encode and decode URL strings in your browser
URL Parser
Break a URL into its components (protocol, host, path, query, fragment)
UUID Generator
Generate UUID v4 or v7 instantly in your browser with one click
ULID / NanoID / Snowflake Generator
Generate ULID, NanoID, or Snowflake IDs in your browser — pick the right format for your keys, tokens, or distributed system
Unicode Normalizer
Normalize text into all four Unicode forms (NFC/NFD/NFKC/NFKD) side-by-side with code points and byte counts
JSON Formatter / Viewer
Format, view, and pretty-print JSON entirely in your browser
HEX to RGB / HEX to HSL Color Code Converter
Convert HEX, RGB, HSL color codes. HEX to RGB, RGB to HEX, HEX to HSL supported
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes in your browser
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly in your browser
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text with configurable paragraphs, sentences, or words
Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case and more
Byte Unit Converter
Convert between bytes, KB, MB, GB, TB, and PB with binary and decimal standards
HTML Entity Encoder / Decoder
Encode and decode HTML entities instantly in your browser
CIDR Calculator
Calculate IP ranges, subnet masks, and network info from CIDR notation
Aspect Ratio Calculator
Calculate and convert aspect ratios for images and video with resize calculator
Regex Tester
Test regular expressions in real time with match highlighting and capture groups
Diff Checker
Compare two texts and see differences line by line with highlighting
Text Reverse
Reverse text by characters, words, or lines
Roman Numeral Converter
Convert between Roman numerals and Arabic numbers (1-3999)
Coin Flip
Flip a virtual coin with cryptographically fair 50/50 probability
Dice Roller
Roll virtual dice (d4-d100) with sum, min, max, and average stats
Random Number Generator
Generate cryptographically secure random numbers with custom range and count
Percentage Calculator
Calculate percentages: X% of Y, X is what % of Y, and percentage change
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin
Age Calculator
Calculate exact age in years, months, days, and total days from birth date
BMI Calculator
Calculate BMI from height and weight with category and healthy range
GCD & LCM Calculator
Calculate GCD and LCM of two or more numbers
Line Sorter
Sort text lines alphabetically, numerically, or by length
Whitespace Remover
Remove extra whitespace from text with trim, collapse, and empty line options
Find & Replace
Find and replace text with regex support
Word Frequency Counter
Analyze word frequency in text with count and percentage
Slug Generator
Generate URL-friendly slugs from text with accent removal and custom separators
Morse Code Translator
Convert between text and Morse code
Binary ↔ Text Converter
Convert between text and binary representation
Chmod Calculator
Calculate Unix file permissions in numeric and symbolic notation
HTTP Status Code Reference
Look up HTTP status codes with descriptions and categories
Date Calculator
Calculate date difference or add/subtract days from a date
Tip Calculator
Calculate tips and split bills easily
Loan Calculator
Calculate monthly payments, total interest, and total cost
Area Calculator
Calculate area of rectangles, circles, triangles, trapezoids, and ellipses
Unit Converter
Convert between units of length, weight, volume, and speed
Timezone Converter
Convert times between time zones worldwide
Countdown Timer
Set a countdown timer with hours, minutes, and seconds
Stopwatch
Online stopwatch with lap time recording
Pomodoro Timer
Pomodoro technique timer with work, short break, and long break phases
Screen Resolution
Display screen resolution, viewport size, pixel ratio, and device info
Keyboard Tester
Test keyboard keys with key name, code, keyCode, and modifier display
Batch Epoch Converter
Convert multiple Unix timestamps at once to ISO, UTC, and local time
CSS Border Radius Generator
Generate CSS border-radius values visually with a live preview
CSS Box Shadow Generator
Generate CSS box-shadow values visually with a live preview
CSS Text Shadow Generator
Generate CSS text-shadow values visually with a live preview
CSS Gradient Generator
Generate CSS linear and radial gradients visually with a live preview
Color Palette Generator
Generate shades, tints, analogous, complementary, and triadic palettes from a base color
HMAC Generator
Generate HMAC using SHA-1, SHA-256, SHA-384, or SHA-512 in your browser
Punycode Converter
Convert internationalized domain names between Unicode and Punycode
CSV to JSON Converter
Convert CSV data to JSON format instantly in your browser
Cron Expression Parser
Parse cron expressions into human-readable descriptions with next run times
CSS Minifier
Minify CSS code instantly. Remove comments and whitespace to reduce file size
CSS Formatter
Beautify minified or compact CSS into a readable form with 2 or 4 space indent
XML Formatter
Format and prettify XML with customizable indentation or minify it
JSON to YAML Converter
Convert between JSON and YAML formats instantly in your browser
SQL Formatter
Format SQL queries with customizable indentation and keyword casing
TOML to JSON Converter
Convert between TOML and JSON formats instantly in your browser
Markdown Table Generator (from Excel / TSV / CSV)
Convert tab-separated or CSV data into a Markdown table. Column alignment supported
XML to JSON Converter
Convert XML into JSON. Attributes go under @attributes, text under #text
Markdown Preview
Preview and render Markdown text in real time
Markdown TOC Generator
Generate a table of contents from Markdown headings with GitHub-style anchors
HTML Preview
Preview HTML code in real time with a sandboxed iframe
HTML Formatter
Beautify minified or single-line HTML with proper indentation
HTML Minifier (Compress HTML)
Strip whitespace, newlines, and comments from HTML; preserves pre/script/style/textarea
QR Code Generator (Free, No Sign-up, No Expiration)
Generate QR codes from text or URLs. Permanent, no sign-up, free. PNG download
Image Compressor
Compress and resize images in your browser. Supports JPEG, PNG, and WebP
Image Format Converter (PNG / JPG / WebP)
Convert images between PNG, JPG, and WebP — all in your browser
Reading Time Calculator
Calculate reading time, speaking time, word count, and more
Color Picker
Pick any color and view it in HEX, RGB, and HSL formats
Salary Calculator
Convert salary between annual, monthly, and hourly rates
Text to Speech
Convert text to speech in your browser with adjustable speed, pitch, and volume
JSON Minifier (Compress JSON)
Strip whitespace from JSON and show before/after byte size
JWT Generator (HS256/384/512)
Generate signed JWTs from a header, payload, and secret. Signing via Web Crypto
JSON Validator
Validate JSON syntax with error detection and formatted output
JSON to TypeScript
Generate TypeScript interface definitions from a JSON sample
Word Counter
Count words, characters, sentences, paragraphs, and lines instantly
CSS Gradient Text Generator
Generate gradient text with CSS. Pick colors, adjust angle, copy code
Discount Calculator
Calculate discount price, savings, and percentage instantly
What Is My IP Address
Find your public IP address and view browser and device information
YouTube Timestamp Link Generator
Generate YouTube links that start at a specific time
Emoji Picker
Browse and search emojis by category or keyword, click to copy
Text to Binary Converter
Convert text to binary (0s and 1s) and back
CSS Unit Converter
Convert between CSS units: px, rem, em, %, vw, vh, svh, lvh, dvh, and more
Electricity Cost Calculator
Calculate electricity costs from wattage, hours, and rate per kWh
Statistics Calculator
Calculate mean, median, mode, variance, and standard deviation from a list of numbers
Color Contrast Checker
Check WCAG AA and AAA contrast ratio between two colors
Random Name Picker
Pick one or more random names from a list
Readability Score Calculator
Calculate Flesch Reading Ease and Flesch-Kincaid Grade Level for English text
Number to Words Converter
Convert numbers to English words and Japanese kanji (including daiji for formal writing)
Markdown to HTML Converter
Convert Markdown to HTML code (GFM support, pretty or minified output)
HTML to Markdown Converter
Convert HTML to Markdown (headings, lists, tables, links, images, code)
JSON to CSV Converter
Convert JSON array to CSV (configurable delimiter, header, and quoting)
Katakana / Hiragana Converter
Convert between katakana and hiragana (kanji and punctuation preserved)
Full-width / Half-width Converter
Convert between full-width and half-width characters (ASCII, katakana, spaces)
Japanese Era Year Converter
Convert between Western year and Japanese era year (Reiwa / Heisei / Showa / Taisho / Meiji)
Prime Number Checker & Factorization
Check if a number is prime and show its prime factorization
Pythagorean Theorem Calculator
Solve for any side of a right triangle; includes perimeter and area
Time Duration Calculator
Calculate hours and minutes between two times (overnight supported)
Day of the Week Calculator
Find the day of the week for any date (also day of year and ISO week)
Latest articles
Browse all articles →-
Cookie attributes guide: SameSite, Partitioned, HttpOnly, Secure, Domain, Path, Priority
HTTP Set-Cookie has more than seven attributes, all relevant to authentication, CSRF defense, and cross-site tracking. This article walks through SameSite (Lax/Strict/None), Partitioned (CHIPS), HttpOnly, Secure, Domain, Path, and Priority — with the recommended combinations for auth cookies, third-party widgets, and CSRF protection.
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CSS Cascade Layers (@layer) deep dive: specificity reset, layer order, and the `!important` reversal
CSS @layer adds named cascade layers, sidestepping specificity wars and letting library styles coexist with app styles cleanly. This article walks through layer ordering, nesting, the unlayered-styles relationship, and the surprising `!important` reversal.
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CSS color gamut: sRGB, Display P3, Rec2020, and OKLCH compared
CSS Color Module Level 4 brings `color()` and `oklch()`, so wider gamuts (Display P3, Rec2020) are finally usable on the web. This article walks through the gamuts each space covers, browser and display support, and the `color-gamut` media query for graceful fallback.
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Choosing DNS records: A vs AAAA vs CNAME vs ALIAS vs TXT vs MX, and the apex CNAME problem
Selecting DNS record types is a use-case decision: pointing root domains at CDNs, delegating subdomains to services, configuring email, attaching verification metadata. This article walks through the standard records, the apex CNAME constraint and its workarounds (ALIAS / ANAME / flattening), and TTL strategy.
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Git diff algorithms compared: myers, minimal, patience, histogram
Git can run four different diff algorithms, and the choice changes whether you optimize for "minimum edit distance" or "human-readable output." This article walks through Myers, minimal, patience, and histogram, with concrete examples and `--diff-algorithm` guidance.
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HTTP Cache-Control deep dive: max-age, s-maxage, must-revalidate, immutable, and stale-while-revalidate
Cache-Control has more than ten directives, and their combinations completely change browser and CDN behavior. This article walks through the directives by role — store-or-not, freshness, revalidation, stale-serving — and how the major CDNs differ in interpretation.