Simple, fast browser tools to streamline your daily web tasks.
Everything runs in your browser. No data sent externally.
Apply mosaic or blur effects using rectangle, circle, or freehand selection. Save as PNG.
Compress images by adjusting quality and size. Before/After comparison view.
Crop images with drag selection. Aspect ratio presets available.
Parse and display EXIF data including date, camera, GPS, and more.
Convert between JPG/PNG/WebP formats. Quality adjustment supported.
Generate social media thumbnail images from a title.
Real-time character, word, and line counting. File import supported.
Highlight differences between two texts. Line-by-line comparison.
Batch apply multiple replacement rules. Regex supported.
Real-time match testing. Capture group display supported.
Convert between fullwidth/halfwidth characters and upper/lowercase.
Convert between spreadsheet data and Markdown tables.
Format, minify, and validate JSON. Syntax highlighting supported.
Create cron expressions visually. Preview next execution times.
Search and reference all HTTP status codes with descriptions and examples.
Generate dummy data (names, emails, etc.) in JSON/CSV format.
Real-time preview. HTML export supported.
Parse URL query parameters into a table format and edit them.
Automatically extract dominant colors from images. Copy HEX/RGB values.
Compare fonts side by side. Adjust size, weight, and line height.
Instant SVG code preview. PNG export supported.
Generate gradient CSS with a visual editor.
Visualize Flexbox property effects. CSS code output.
Convert between Unix timestamps and date/time. Current time display.
Encode/decode strings and images to/from Base64.
Parse and display JWT token headers and payloads.
Generate MD5/SHA-1/SHA-256 hash values.
Generate QR codes from text or URLs. Resizable, PNG export.
Calculate aspect ratio from width and height. Reverse resize calculation.
Auto-generate complementary, analogous, triadic, and other color schemes.
25/5 minute focus timer. Session management, notifications, and sounds.
Generate secure passwords with custom criteria. Strength indicator included.
Real-time conversion for length, weight, and data size.
Display IP, user agent, screen resolution, and other browser info.
Advanced bill splitting with weighted distribution.
Stopwatch with lap time recording and CSV export.
Calculate age from birthdate, display Japanese era, and count days between dates.
Calculate monthly payments, total repayment, and interest from loan amount, rate, and term.
Calculate BMI and assessment from height and weight. Ideal weight included.
Simple browser notepad. Auto-save and multiple notes supported.
Generate favicons from images or text.
％割引・増減率・全体に対する割合などを一括で計算。
The site is built around practical browser tools, clear navigation, and local processing so users can complete small daily tasks without sending input data away.
Inputs such as images, text, JSON, and passwords are generally processed inside your own browser. This keeps quick checks and temporary conversions private and lightweight.
Tools are grouped into image, text, development, design, conversion, utility, and calculator categories. Search, category pages, and related tools help users move to the next task quickly.
Web Tool Lab targets the small tasks that happen repeatedly but do not need a full desktop app. Each tool page includes usage steps, features, FAQs, and related tools.
A set of browser-based image tools for compression, conversion, cropping, metadata checks, and privacy-friendly masking. Useful before publishing images on social media, preparing web assets, or cleaning up presentation materials.
Tools for everyday text work such as counting, replacing, comparing, reading aloud, and converting tables. Useful for draft review, log cleanup, documentation prep, and small editorial tasks.
Developer utilities for JSON, Cron, HTTP, URLs, UUIDs, subnets, and other checks that come up repeatedly during development and operations. Designed for quick validation before opening heavier tools.
Design helpers for colors, fonts, CSS, aspect ratios, mockups, and visual materials. Useful when testing UI ideas, preparing assets, or checking layout details.
Converters and validators for Base64, JWT, hashes, QR codes, URL encoding, and related formats. Helpful for API work, shareable data, and specification checks.
Small practical utilities such as timers, notes, password generation, unit conversion, and random selection. Built for quick use without accounts or setup.
Calculators for age, dates, loans, BMI, percentages, world time, and everyday business/life math. Useful for quick estimates and checking formulas.