Does the tool add its own watermark to my download?

No. iFormat never stamps its own branding on your images. The only watermark on the output is the text or logo you add yourself.

Does the tool add its own watermark to my download?

No. iFormat never stamps its own branding on your images. The only watermark on the output is the text or logo you add yourself.

2026 年 3 月更新

写真に透かしを追加する

任意の画像にテキストやロゴの透かしを追加する無料のオンラインツールです。不透明度、サイズ、回転、位置を調整したり、写真全体に並べて表示したりできます。プライバシーを最大限に高めるためにブラウザで処理されます。

ドロップまたはクリックしてアップロードします PNG、JPG、WebP、または BMP

最大ファイルサイズは10MBです。サインアップさらに詳しく。

How to Add a Watermark to a Photo in 3 Steps

画像のアップロード、テキストやロゴの追加、ダウンロードはすべてブラウザーで行えます。

画像をアップロードする

Select a photo from your device. Drag-and-drop or browse — PNG, JPG, WebP, and BMP all work.

Add Text or Logo

Type your watermark or upload a logo, then set opacity, size, rotation, and position. Tile it to cover the whole photo.

ダウンロード

Pick PNG, JPG, or WebP and click Download. Your watermarked image keeps its full original resolution.

Popular Use Cases

Protect and brand your images for any purpose.

Protect Photos

Stamp a copyright watermark before sharing images online to deter theft and unauthorised reuse.

Brand Content

Add your logo or handle to product photos, blog images, and social posts for consistent branding.

Photographers

Watermark client proofs and portfolio shots before delivery to protect your work.

Documents & Drafts

Mark image exports as “Draft”, “Confidential”, or “Sample” with a tiled text watermark.

Why Choose Our Watermark Tool

Text and Logo

Add a text watermark, upload your own logo, or both. Full control over every setting.

No Output Watermark

The only mark on your image is the one you add. iFormat never brands your downloads.

フル解像度

Watermarks are applied at your image’s native resolution — no downscaling, no quality loss.

Browser-Based Privacy

All processing happens locally using the Canvas API. Your images never leave your device.

Tile or Place

Drag the watermark anywhere, snap to nine positions, or tile it diagonally across the whole photo.

Works on Any Device

Responsive design works on desktop, tablet, and mobile. No app installation required.

よくある質問

How do I add a watermark to a photo?

Upload your image, then type your watermark text or upload a logo. Adjust the opacity, size, rotation, and position, and click Download to save the watermarked photo. Everything happens in your browser.

Can I use my own logo as a watermark?

Yes. Switch to the Logo tab and upload a PNG (transparent logos work best). You can resize it, move it anywhere on the photo, set its opacity, and tile it across the whole image if you want.

このツールはダウンロードに独自のウォーターマークを追加しますか?

いいえ、iFormat が画像に独自のブランドをスタンプすることはありません。出力上の唯一の透かしは、自分で追加したテキストまたはロゴです。

Can I tile the watermark across the whole image?

Yes. Turn on Tile / Repeat to stamp the watermark diagonally across the entire photo — the standard way to protect images from theft or unauthorised reuse.

Are my photos uploaded to a server?

No. All watermarking is done locally in your browser using the HTML5 Canvas API. Your images never leave your device, so your files stay completely private.

What image formats can I use and export?

You can upload PNG, JPG, JPEG, WebP, and BMP images. Export as PNG (keeps transparency), JPG, or WebP. The output keeps the original resolution of your photo.

Can I add a watermark on my phone?

Yes. The tool is fully responsive and works on iPhone, Android, tablets, and desktop browsers — no app installation needed.

Watermarking and Image Protection Guides

Helpful articles about protecting your photos, adding logos, copyright marks, and branding images for social platforms.

オンラインで無料でビデオを圧縮する方法 — MP4、MOV、AVI、WebM

ビデオが大きすぎて送信またはアップロードできませんか?オンラインで無料で圧縮します。透かしを入れずに MP4、MOV、AVI、WebM のファイルサイズを削減します。品質と解像度を選択します。