オンラインで透かしを追加
テキスト透かしで画像を保護。無料、プライベート、瞬時 — すべてブラウザ内で完結します。
100%プライベート — ファイルがデバイスから送信されることはありません。すべての処理はブラウザ内で完結します。
ここに画像をドロップ
またはクリックして選択 — JPG、PNG、WebP対応
48
30%
結果
透かしツールの仕組み
このツールは、ブラウザ内蔵のCanvas APIを使用して、カスタマイズ可能なサイズ、色、不透明度、位置でテキストを画像に重ねます。処理全体がお使いのデバイス上でローカルに実行されます。画像がサーバーに送信されることは一切ありません。
Tips for Adding Watermarks
- Set opacity between 30–50% — A watermark should protect your work without ruining the viewing experience.
- Use tiled mode for maximum protection — The tiled watermark repeats across the entire image, making it impossible to crop or clone out.
- Position strategically — Place watermarks on important areas that cannot be easily cropped out.
- Use white text with a dark shadow — White text with subtle shadow is visible on both light and dark image areas.
- Keep watermark text short — Use your name, brand, or a simple copyright symbol for a clean look.
- Match watermark size to image resolution — Adjust font size relative to image dimensions for best results.
When to Watermark Your Images
- Protecting photography portfolios — Add watermarks to portfolio previews to prevent unauthorized use of your photographs.
- Client proofing — Send watermarked proofs to clients for review before delivering final versions.
- Stock photography submissions — Add your own watermark before uploading to stock marketplaces.
- Social media branding — Add a subtle watermark with your brand name to images shared on social media.
- Protecting design mockups — Watermark design proposals and artwork drafts shared with clients for feedback.
よくある質問
透かしは除去できますか？
透かしはエクスポートされた画像のピクセルに永続的に埋め込まれます。簡単に除去することはできないため、作品の保護に効果的です。透かしなしの元のファイルは安全に保管してください。
タイルオプションとは？
タイルオプションは透かしテキストを画像全体に斜めに繰り返し配置します。透かしを切り抜きで除去できないため、より強力な保護を提供します。ストックフォトやプルーフに一般的に使用されます。
利用可能な出力形式は？
透かし入り画像はJPEG、PNG、WebPとしてエクスポートできます。用途に最適なフォーマットをお選びください。
What opacity level should I use for my watermark?
For subtle branding, 20–30% opacity works well — the watermark is visible on close inspection but doesn't distract from the image. For stronger protection (client proofs, stock previews), use 40–60% opacity. Avoid going above 70% as it makes the image difficult to evaluate and looks unprofessional.
Where should I place my watermark?
For branding, the bottom-right corner is the standard position — it's visible but unobtrusive. For protection, center the watermark over the main subject so it can't be cropped out. For maximum security, use the tiled mode which covers the entire image with repeated watermarks.
Does adding a watermark protect my copyright?
A watermark serves as a visual deterrent and a notice of ownership, but it does not create or replace legal copyright protection. In most countries, copyright exists automatically when you create an original work. A watermark helps prove ownership and discourages unauthorized use, but for full legal protection, consider registering your work with your country's copyright office.
Can I watermark multiple images at once?
The watermark tool processes one image at a time, giving you full control over watermark placement and appearance for each photo. After downloading one watermarked image, you can quickly load the next. Your watermark settings (text, opacity, position, size) are preserved, making it fast to process a series of images.