無料オンライン画像圧縮ツール

Yes, the 画像圧縮ツール on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

Web用に品質を落とさず画像を圧縮します。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The 画像圧縮ツール runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The 画像圧縮ツール processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the 画像圧縮ツール works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

The 画像圧縮ツール works with common image formats supported by your browser, including JPEG, PNG, WebP, and GIF. SVG support varies by tool. No format conversion plugin or driver is needed.

Yes. The 画像圧縮ツール processes files entirely in your browser using the Canvas API. Very large files (over 20 MB) may take a few extra seconds on older or lower-powered devices. Closing other tabs can free up memory for better performance.

Yes. The 画像圧縮ツール is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.