Free Online Tools (112)
112 free tools, no sign-up, no limits.
No results found.
Character Counter
Count characters, words, lines, paragraphs, and reading time in real time. Includes Twitter/X, Instagram, and LINE character limit bars.
Word Counter
Count words, characters, and estimated reading time in real time for English and Japanese text.
Remove Line Breaks
Remove or replace line breaks from PDF, Word, or any copied text. 5 conversion modes available.
Text Diff Checker
Compare two texts in real time. Added lines shown in green, deleted lines in red, with character-level diffing.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, or CONST_CASE in real time.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text by paragraphs, sentences, or words. Optional "Lorem ipsum..." start.
Duplicate Line Remover
Remove duplicate lines from text in real time. Case-sensitive toggle and whitespace trimming options included.
Line Sorter
Sort lines alphabetically (A→Z, Z→A), by length, randomly, or reverse — instantly in your browser.
Word Frequency Counter
Count word occurrences and keyword frequency in your text. Ranked table with minimum word length filter.
Text to Slug Converter
Convert text to URL-friendly slugs in real time. Choose dash, underscore, or dot separator.
Whitespace Cleaner
Clean extra spaces, tabs, and blank lines from text in real time. 5 fine-grained cleaning options.
Text Repeater
Repeat any text a specified number of times. Custom separator: newline, space, comma, or none.
Romaji Converter
Convert hiragana and katakana to Hepburn or Kunrei romanization. Useful for service names and URLs.
JSON Formatter & Validator
Format, validate, and beautify JSON in real time. Syntax highlighting, error line numbers, copy and download supported.
JSON Minifier
Minify JSON in real time. Shows before/after byte size and reduction rate.
CSS Minifier
Minify CSS by removing comments, whitespace, and unnecessary characters. Shows compression percentage.
JavaScript Minifier
Minify JavaScript by removing comments and extra whitespace. Shows before/after size comparison.
SQL Formatter
Format and indent SQL queries for readability. Keywords are placed on new lines automatically.
Regex Tester
Test regular expressions in real time. Match highlighting, group capture, and flag controls (g, i, m).
JSON to CSV Converter
Convert JSON arrays to CSV format. Auto-detects headers from all objects. Choose delimiter.
CSV to JSON Converter
Convert CSV data to JSON arrays. Custom delimiter support with quoted field handling.
Color Code Converter
Convert color codes between HEX, RGB, and HSL formats. Color picker included for quick selection.
Unix Timestamp Converter
Convert Unix timestamps (seconds or milliseconds) to readable dates and vice versa. Auto-detects format.
Number Base Converter
Convert numbers between binary (2), octal (8), decimal (10), and hexadecimal (16) simultaneously.
JWT Decoder
Decode JWT tokens in real time. Header, Payload, and Signature displayed with color coding. Expiry check included.
Cron Generator
Generate cron expressions with a GUI. Set minute, hour, day, month, and weekday with preset buttons.
Cron Parser
Parse cron expressions into human-readable descriptions. Shows next 5 execution times.
HTML Minifier
Minify HTML by removing whitespace and optional comment stripping. Shows compression ratio.
Markdown to HTML Converter
Convert Markdown to HTML with live preview. Supports headings, bold, italic, links, lists, code blocks.
HTML Entity Converter
Encode special characters to HTML entities (&, <, >) or decode them back to plain text.
HTML Meta Extractor
Paste HTML source to extract all meta tags, title, OGP, and Twitter Card tags in a structured table.
JWT Generator
Generate HS256-signed JWT tokens with custom claims (sub, iss, exp, aud) and a secret key.
JSON to TypeScript
Automatically generate TypeScript interfaces from JSON objects. Supports nested objects and arrays.
JSON Diff
Compare two JSON objects and show differences by path. Added, removed, and changed values highlighted.
YAML to JSON Converter
Convert YAML to JSON in your browser. No server required. Supports nested objects and arrays.
JSON to YAML Converter
Convert JSON to YAML format instantly in your browser. Clean, readable YAML output.
Current Timestamp
Display the current Unix timestamp in seconds, milliseconds, ISO 8601, UTC, and local time. Freeze & copy.
Timestamp Diff
Calculate the difference between two dates in days, hours, minutes, and seconds. Total values included.
Meta Tag Generator
Generate all essential meta tags — title, description, OGP, Twitter Card, robots, canonical — from a simple form. No signup required.
Meta Tag Checker
Check and analyze meta tags (title, description, OGP, Twitter Card) of any URL in real time.
OGP Checker
Enter any URL to instantly fetch and preview OGP tags: og:title, og:image, og:description, and more.
SERP Preview
Preview how your page title and meta description appear in Google search results. Mobile and desktop preview.
Keyword Density Checker
Analyze keyword density in your content. Shows top keywords, frequency, and density percentages.
Readability Checker
Check readability with Flesch Reading Ease score, grade level, reading time, and writing statistics.
Robots.txt Generator
Generate a robots.txt file with user-agent rules, allow/disallow paths, and sitemap URL.
AI Crawler Checker
Check if AI crawlers (GPTBot, Claude, CCBot, etc.) are blocked by your robots.txt. Paste URL or robots.txt to verify.
Robots.txt Templates
Choose from ready-to-use robots.txt templates: allow all, block AI crawlers, WordPress, e-commerce, and more.
robots.txt Checker
Validate your robots.txt file and check which crawlers are allowed or blocked. Syntax error detection included.
JSON-LD Generator
Generate JSON-LD structured data for WebSite, WebPage, Article, BreadcrumbList, and FAQ schemas.
Meta Description Generator
Write and optimize meta descriptions with real-time character counting, length indicator, and SERP preview.
Canonical Tag Generator
Generate canonical link tags to prevent duplicate content issues. Paste URL and copy the HTML tag.
Hreflang Generator
Generate hreflang link tags for multilingual websites. Add language/region pairs and get the HTML tags.
UTM URL Generator
Build UTM-tagged URLs for Google Analytics campaign tracking. Set source, medium, campaign, term, and content.
URL Encoder & Decoder
Encode or decode URLs using percent-encoding. Supports international characters.
URL Decoder
Decode percent-encoded URLs to readable text. Supports full URLs and individual components.
Base64 Encoder & Decoder
Convert text or files to and from Base64. Supports URL-safe Base64 encoding.
Base64 Decoder
Decode Base64 encoded strings to plain text instantly. Supports standard and URL-safe Base64.
Base64 to Image
Paste a Base64 data URL to preview the image in your browser and download it as PNG or JPG.
Base64 Size Calculator
Calculate the estimated Base64-encoded size of any file. Shows original size, encoded size, and overhead.
Data URL Parser
Parse data URLs to extract MIME type, encoding, and raw data content.
UUID Generator
Generate UUID v1 or v4 with one click. Supports bulk generation and CSV export.
Random String Generator
Generate random strings with custom length, character sets (alphanumeric, hex, symbols). Bulk generation supported.
Hash Generator
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) from text or files instantly in your browser.
QR Code Generator
Generate QR codes for URLs, text, or any content. Custom colors and size. Download as PNG.
Barcode Generator
Generate barcodes in CODE128, EAN-13, EAN-8, UPC, CODE39, and more formats. Download as SVG or PNG.
Password Generator
Generate strong, random passwords with uppercase, lowercase, numbers, and symbols.
CSS Gradient Generator
Visually create linear and radial CSS gradients. Adjust angle, colors, and color stops with live preview.
CSS Box Shadow Generator
Generate CSS box-shadow values with visual controls. Adjust offset, blur, spread, color, and inset.
CSS Flexbox Generator
Build Flexbox layouts visually. Set flex-direction, justify-content, align-items, wrap, and gap with live preview.
CSS Animation Generator
Generate CSS animations visually. Choose from 8 presets or customize timing, easing, and iteration count.
CSS Clip Path Generator
Visually generate CSS clip-path values (circle, ellipse, polygon, inset) with live preview.
Color Contrast Checker
Check color contrast ratios against WCAG AA and AAA standards. Pass/fail for normal text, large text, and UI components.
Timezone Converter
Convert date and time across 20+ worldwide timezones at once. UTC, US, Europe, Asia, and more.
Unit Converter
Convert units of length, weight, temperature, area, volume, and speed. All conversions shown at once.
Tax Calculator
Calculate price including or excluding tax with custom tax rate. Both forward and reverse (back-calculation) supported.
Bill Splitter
Split a bill among multiple people with custom tip percentage. Per-person amount calculated instantly.
Aspect Ratio Calculator
Calculate aspect ratios and scale dimensions. Find missing width or height from a given ratio.
Color Palette Generator
Generate color palettes from a base color: complementary, triadic, analogous, tetradic, and shades.
UUID v1 Generator
Generate UUID version 1 (time-based) UUIDs in bulk. Copy individual or all at once.
UUID v7 Generator
Generate UUID version 7 (time-ordered) UUIDs. Millisecond-precision sortable identifiers.
Percentage Calculator
Calculate percentages: X% of Y, what % is X of Y, and percentage change between two numbers.
Age Calculator
Calculate your exact age in years, months, and days from your birthdate. Next birthday countdown included.
Random Number Generator
Generate random integers or decimals in a custom range. Unique number mode with bulk output.
Random Color Generator
Generate random color palettes with one click. Lock colors to keep them while regenerating others.
OGP Image Generator
Generate OGP/social share images (1200×630px) in your browser. Custom title, subtitle, colors, and download as PNG.
Image Compressor
Compress PNG, JPEG, and WebP images in your browser. Reduce file size by up to 90% without visible quality loss.
Image Resizer
Resize images to exact pixel dimensions in your browser. Aspect ratio lock option. Download as PNG.
PNG to JPG Converter
Convert PNG images to JPEG in your browser. Set quality and background color for transparent areas.
JPG to PNG Converter
Convert JPEG images to PNG format in your browser. Lossless output with transparency support.
WebP Converter
Convert any image (PNG, JPG, GIF) to WebP in your browser. Quality slider with file size comparison.
SVG to PNG Converter
Convert SVG files to PNG in your browser. Choose output scale (1x, 2x, 3x, 4x) for high-res export.
Image Cropper
Crop any image by dragging a selection area. Supports free crop or fixed aspect ratios (1:1, 4:3, 16:9). Download as PNG or JPEG. No upload required.
Favicon Generator
Generate favicons (16×16, 32×32, 64×64, 128×128px) from text with custom colors and rounded corners.
Image to Base64 Converter
Convert images to Base64 Data URLs or decode Base64 back to viewable images. Bidirectional converter.
GIF Compressor
Compress and optimize animated GIF files to reduce file size without losing quality. Browser-based, no upload needed.
Image Rotator
Rotate images by any angle (90°, 180°, 270°, or custom). Live preview and PNG download.
Image Flip
Flip images horizontally, vertically, or both. Live preview with instant browser-side processing.
Image Grayscale Converter
Convert any image to grayscale in your browser using canvas pixel processing. Side-by-side preview.
Image Blur Tool
Apply Gaussian blur to images with adjustable intensity (1–30px). Live preview and PNG download.
Image Resize by Percentage
Resize images by percentage (10%–200%). Quick preset buttons for 25%, 50%, 75%, etc.
Image Metadata Viewer
View image metadata: file name, type, dimensions, megapixels, aspect ratio, file size, and last modified date.
Date Formatter
Format dates with custom patterns (YYYY-MM-DD, etc.). Supports ISO 8601, RFC formats, and custom templates.
Business Days Calculator
Calculate the date after adding business days, excluding weekends and Japanese public holidays (2020–2026).
Week Number Checker
Find the ISO week number and day of year for any date. Shows start and end date of the week.
Date Add Calculator
Add or subtract days, weeks, months, or years to a date. Calculates the resulting date instantly.
Countdown Timer
Create a countdown to any future date and time. Shows days, hours, minutes, and seconds remaining.
HTTP Headers Checker
Inspect HTTP response headers for any URL. Check security headers, cache-control, content-type, and more.
URL Parser
Parse any URL into its components: protocol, host, pathname, query parameters, and hash.
Password Strength Checker
Check password strength against length, character variety, sequences, and common passwords. WCAG-style scoring.
IP Address Lookup
Look up your current public IP address with city, region, country, ISP, and timezone information.
Amida Kuji (Ghost Leg)
Generate and animate a traditional Amida Kuji (ghost leg) lottery. Assign names and prizes, then reveal results.
Roulette Wheel Spinner
Spin a customizable roulette wheel to pick a random winner from your list of options.