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Encode Hidden Intent Within Any Text.

A mathematically-precise API & MCP server that embeds and decodes watermark payloads using zero-width unicodes—without changing how your text looks or feels.

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Text watermarking concept visual

Why TextWatermark?

Steganography

Unicode Precision

Insert zero-width code-points, invisible to users, robust against standard sanitizers.

Reversibility

Lossless Decode

Retrieve your exact payload bit-for-bit across CMS, email, or PDF conversions.

Integration

Language Agnostic

Official SDKs (JS, Python, Go) & OpenAPI schema for rapid code-generation.

Reliability

Enterprise SLA

99.9% uptime, audit trails, on-prem/VPC options, and signed DPAs available.

Developer-Centric Toolkit

API Reference

View Full API Reference

Interactive API Console

Configure your request:

POST

Response:

// API response will appear here

Impressed by the demo? Sign up now to integrate TextWatermark with your own content and secure your data.

Create Your Free Account

Straightforward Pricing Plans

Choose the plan that fits your needs. Start for free, scale as you grow.

Free

$0/mo

100 credits to get started

  • 100 one-time credits
  • Fast & robust watermarking
  • 1 API key
Start Free
Most Popular
Starter

$7 /mo

Billed annually ($86/year)

  • 5,000 credits / month
  • Fast & robust watermarking
  • 3 API keys & signing channels
  • Email support
Choose Starter
Pro

$23 /mo

Billed annually ($278/year)

  • 25,000 credits / month
  • Fast & robust watermarking
  • 10 API keys & signing channels
  • Priority support & 99.9% SLA
Choose Pro

Trusted by leading developer teams and legal firms:

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Frequently Asked Questions

How does text watermarking work?
Our system subtly modifies characters or spacing within your text to embed a unique identifier. This process can be tuned for visibility and resilience, allowing you to track or authenticate the text without significantly altering its appearance.
Is the watermarking process secure?
Yes, data security is paramount. The information embedded is typically hashed or encrypted, and our API communications use industry-standard SSL/TLS. For enterprise clients, we offer advanced security features and compliance options.
What are the limits on Unicode character embedding?
Our system supports a wide range of Unicode characters. However, the effectiveness and subtlety of watermarking can vary with complex scripts. We provide detailed guidelines and testing tools to ensure compatibility with your specific content.
What kind of Service Level Agreements (SLAs) do you offer?
SLAs are available for our Enterprise plan customers. These typically cover API uptime, support response times, and can be customized to meet specific business requirements. Please contact our sales team for more details.