Media
Adaptive 12-Point Hidden Watermark
Add a subtle text watermark to one image or every supported image in a ZIP, at all, random, or chosen perimeter positions with automatic dark/light local contrast.
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/adaptive-12-point-hidden-watermark' \
-H 'Content-Type: application/json' \
-d '{"filename":"imageFile.ext","contentType":"application/octet-stream","size":12345}'
curl -X POST 'https://api.elysiatools.com/api/upload/presign/adaptive-12-point-hidden-watermark' \
-H 'Content-Type: application/json' \
-d '{"filename":"zipFile.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/adaptive-12-point-hidden-watermark' \
-F 'imageFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'zipFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'watermarkText=Buyer: demo-user
example.test/creator' \
-F 'placementMode=all' \
-F 'randomCount=4' \
-F 'randomSeed=' \
-F 'selectedPositions=' \
-F 'opacity=0.18' \
-F 'fontSizePercent=1.6' \
-F 'insetPercent=1.2' \
-F 'outputFormat=preserve'