Watermark API supercharged for limitless creative control
If all you need is a basic watermark slapped on your images, there are plenty of APIs that’ll do the job – and charge you per file. But if you need real control, Polotno SDK gives you the flexibility to apply watermarks exactly how you want.
Whether it’s a simple logo, a custom grid pattern across the whole image, or dynamic watermarks that adjust in real time, Polotno lets you build watermarking features directly into your app, platform, or local server – no third-party limits, no per-file fees.
No credit card needed, zero sales pressure
Why Polotno SDK outperforms traditional watermark APIs
Most APIs are limited. They charge you per file, restrict placement options, and leave you with generic results. Polotno SDK breaks those limitations by giving you total creative and technical control.
Custom watermarks at scale
Add logos, text, or images as watermarks—anywhere on the canvas.
Use dynamic positioning: bottom-right for some images, full-grid overlays for others.
Apply multiple watermarks simultaneously (e.g., a grid pattern across an entire image).
Adjust opacity, rotation, and scaling programmatically based on the image size or format.
Flat Subscription – no per-file fees
Why pay every time you watermark a file? Unlike traditional watermarking APIs, Polotno SDK runs on a flat subscription—process as many images as you want without worrying about skyrocketing costs.
Polotno SDK for watermarking – canvas demo
With Polotno SDK setting up watermarking can be done entirely programmatically – every aspect, from placement and opacity to scaling and rotation, can be customized through code. This gives you full control for automating watermark application across thousands of images at scale.
But if you need a more hands-on approach, Polotno also allows you to manually create watermark patterns or design custom templates directly on the canvas. Once created, these templates can be saved and applied automatically later, streamlining repetitive tasks without sacrificing flexibility or creative control.
Here's a demo for you to explore what's possible in a 'manual' mode:
Real-world use cases for Polotno SDK for watermarking
Print-on-demand platforms
Automatically apply watermarks to custom designs before users place orders. Ensure every mockup is protected without limiting design flexibility. For example:
Apply different watermarks for free and paid users.
Add dynamic elements like the user’s name or design ID directly onto the watermark.
Digital marketplaces
Protect creator-generated content by dynamically applying watermarks to images, previews, or downloadable assets. Customize watermark opacity based on membership level or user permissions.
Enterprise security tools
Add confidential stamps, dynamic watermarks, or traceable codes to sensitive documents processed entirely within your secure network—no third-party processing required.
Custom design apps
Let users add their own watermarks, adjust placement, or even upload logos for branding—directly within your app. Offer live previews and dynamic editing options for a premium user experience.
Ready to Take Full Control of Watermarking?
Basic APIs like CloudConvert are fine if all you need is a simple logo in the corner. But when you need full creative control, unlimited processing, and zero compromises on data privacy, Polotno SDK is the tool built for the job.
Stop paying per file. Start creating watermarking workflows that work the way you want. Try Polotno SDK today and watermark without limits.