Design
Image Watermark Tool
Add text watermarks to images with customizable position, color, size, and transparency
file· File resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/image-watermark' \
-H 'Content-Type: application/json' \
-d '{"filename":"imageFile.ext","contentType":"application/octet-stream","size":12345}'
# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
--data-binary @/path/to/file.ext
# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/image-watermark' \
-F 'imageFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'watermarkText=© Watermark' \
-F 'position=bottom-right' \
-F 'fontSize=40' \
-F 'fontColor=#ffffff' \
-F 'opacity=0.7' \
-F 'rotation=0' \
-F 'backgroundColor=#000000' \
-F 'backgroundOpacity=0.3'