Image Watermark
Add a customizable text watermark to an image
Image Watermark — what it does
Add a text watermark to a single image with control over the text, its position, font size, opacity and colour. Where the batch tool applies one setting to many files, this is for the image that needs its watermark placed just so — over the right part of the picture, in the right tone.
When this tool helps
- Marking a photo with your name or site before posting it publicly.
- Stamping DRAFT or SAMPLE across a preview image sent for approval.
- Adding a copyright line to an image that will circulate beyond your control.
How to use it
- Choose the image.
- Enter the watermark text and choose a position.
- Set font size, opacity and text colour.
- Process and download the watermarked image.
Accuracy, limits, and good practice
- White text at 40 percent opacity works over most photographs; pure black disappears into shadows and pure white blows out against sky.
- Position for the image at hand: a corner keeps the subject clear but crops away easily, while the centre is intrusive and hard to remove.
- Size the text against the image's dimensions, not by eye at zoom level — what looks right on a preview can be illegible on the full file.
Frequently asked questions
Can I use a logo image as the watermark?
This tool applies text. For a logo across pages of a document, the PDF image stamp tool does the equivalent for PDFs.
Does a watermark stop image theft?
It deters casual reuse and keeps attribution visible, but it is not enforcement and can be edited out by someone determined.
How do I watermark many images at once?
Use the batch image watermark tool, which applies one text and position across a whole selection.
Related tools on this site
- Favicon PNG Generator — Create common favicon and app icon PNG sizes from one image
- Crop Image — Crop an image using precise pixel coordinates
- RGB Channel Splitter — Separate an image into red, green, and blue channel images
Everything above runs inside this page. Image Watermark needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
圖片浮水印能做什麼
為單張圖片加上文字浮水印，可控制文字內容、位置、字級、透明度與顏色。批量工具是把同一組設定套到很多檔案，這個工具則是為了那張需要「浮水印剛好放在對的位置、用對的色調」的圖片而存在。
什麼時候用得上
- 公開發佈前，在照片上標註自己的名字或網站。
- 在送審的預覽圖上打上「草稿」或「樣張」。
- 為將流傳到你控制之外的圖片加上版權標示。
使用步驟
- 選擇圖片。
- 輸入浮水印文字並選擇位置。
- 設定字級、透明度與文字顏色。
- 執行處理並下載加浮水印的圖片。
精確度、限制與實務建議
- 白色文字搭配 40% 透明度適用於多數照片；純黑會沒入暗部，純白則在天空上過曝。
- 位置要看圖決定：角落不擋主體但容易被裁掉，置中干擾大卻難以移除。
- 字級要對照圖片實際尺寸設定，而不是在縮放預覽下用眼睛抓——預覽剛好的大小，在完整檔案上可能小到看不清。
常見問題
可以用商標圖當浮水印嗎？
本工具處理文字。若要在文件每頁疊商標，PDF 圖片戳記工具能做到等效的事。
浮水印能防止盜圖嗎？
它能嚇阻隨手取用並保留出處，但不是強制力，有心人仍可能把它修掉。
怎麼一次為多張圖加浮水印？
請用批量圖片浮水印工具，它會把同一段文字與位置套用到整批選取。
本站相關工具
- Favicon PNG 產生器 — 由一張圖片產生常用網站與 App 圖示尺寸
- 圖片裁剪 — 使用精確像素座標裁剪圖片
- RGB 色彩通道分離 — 將圖片分離成紅、綠、藍三個通道圖片
以上步驟全部在這個頁面內完成，圖片浮水印 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。