Free Online Watermark Adder
写真にテキストまたは画像の透かしを追加します。
Frequently Asked Questions
Is the 透かし追加 free to use?
Yes, the 透かし追加 on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the 透かし追加 work?
写真にテキストまたは画像の透かしを追加します。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.
Do I need to install anything to use the 透かし追加?
No installation needed. The 透かし追加 runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the 透かし追加?
Completely safe. The 透かし追加 processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the 透かし追加 work offline?
After the page loads for the first time, the 透かし追加 works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or WHOIS lookups) require an active connection.
What image formats does the 透かし追加 support?
The 透かし追加 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.