Ship small things.
Browser Tools
Simple tools for everyday use that run entirely in your browser.
Web Performance Test
Measure your device's computing performance in the browser and evaluate with scores and ranks.
Image Resizer & Cropper
Lighten and convert images to WebP format in the browser. Supports batch processing and EXIF removal.
QR Code Generator
Generate QR codes from URLs or text. Supports logo embedding, Wi-Fi setup, and calendar event creation.
QR Code Reader
Upload a QR code image to decode the embedded string. URLs can be opened directly. All processing is done in the browser.
PDF Editor (Image & PDF Export)
Extract, merge, or convert PDF pages to images. Select specific pages with previews. Runs safely in the browser.
Text Encoding Converter
Automatically detect and convert character encodings (UTF-8, Shift_JIS, etc.) while simulating the target file size. Supports pasting text.
Photo Exif Viewer
Read photo metadata like shooting date, camera info, and GPS. Photos are processed locally for safety.
Password Generator
Create passwords with specific conditions. Settings are included in the URL for easy sharing. Runs safely in the browser.
Text Scratchpad
A place to temporarily save text. Saved text is stored in your browser's local storage.
Device Info Checker
Displays screen size and user agent information for your current device.
Text Diff Checker
Compare two texts or files and visually highlight differences. Supports multiple file uploads and various comparison modes.
Date Comparison Tool
Calculate the difference between two dates. Supports various date input formats.
Roulette Maker
Easily draw from an entered list. Features include removing drawn items and saving history.
Chrome Extensions
Extensions available on the Chrome Web Store to make your development and browsing more comfortable.
EnvIcon
A browser extension for developers that changes the favicon based on production, staging, and development environments.
Nickmark
ニックネームを使ってアドレスバーからブックマークへ瞬時にアクセスするための、キーボード操作特化型拡張機能。
MdPicker
Easily copy web page links in Markdown format with this browser extension.
Ketchup Timer
A Pomodoro timer with a fun ketchup bottle concept. The ketchup level represents your remaining focus time, making productivity more visual and engaging.
Shiftless Enter for Gemini
An extension to enhance the Google Gemini web interface. Use Enter for new lines and Cmd/Ctrl+Enter to send.