Watermark API

Watermark API — Add text watermark to images (PNG/JPEG) or every PDF page.

What you get

• POST /v1/watermark/image · POST /v1/watermark/pdf — primary endpoint.
• X-API-Key authentication, per-key rate limits, audit log.
• OpenRouter-backed where AI is involved — no model keys to manage on your side.
• Interactive Swagger docs at api-watermark.knowlez.com/docs.

Plans

• Starter — $9/mo · 5,000 ops included · $0.001/op overage.
• Pro — $29/mo · 50,000 ops included · $0.0007/op overage.