CopySeal
Invisible Image & PDF Watermarking

Protect your images
without ruining them.

Now for PDFsPer-page cryptographic key — same invisible workflow

Embed a cryptographic watermark into every image or PDF — proof of authorship that survives compression, cropping, reposts, and Save As.

Start Protecting FreeView API Docs

No credit card required · 5 free images/month · Setup in 30 seconds

Original Image

<2s processing

DWT-DCT-SVD

Protected
Same image + invisible watermarkCryptographically signed
PDFPNGJPGWEBP

Trusted by creators and businesses worldwide

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Images Protected

0.0%

Detection Rate

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Processing Time

0.0/5

User Rating

How It Works

Three Simple Steps to Protect Your Images

No technical skills required. Embed invisible watermarks in seconds and verify ownership anytime.

Step 01

Upload Your Image

Drag and drop or select any image file. We support PNG, JPG, JPEG, and WEBP formats up to 100 MB.

Step 02

AI Embeds Watermark

Our DWT-DCT-SVD algorithm embeds your watermark text invisibly into the image's frequency domain. The watermark survives compression, cropping, and manipulation.

Step 03

Verify & Extract Anytime

Use the unique key returned during embedding to extract and verify the watermark from any copy of the image — even after edits.

Capabilities

Image & PDF watermarking

One invisible watermark, two powerful formats. Both capabilities share the same robust infrastructure — pick the one that fits your workflow.

Image

Image watermarking

Original
Protected
  • Zero visible difference between original and watermarked
  • Survives JPEG compression, cropping, rotation & scaling
  • 99.7% detection rate with cryptographic verification
Try Image Watermarking

PDF

PDF watermarking

New
contract.pdf
  • Per-page cryptographic key — trace who leaked what
  • Survives Save As, printing, and screenshots
  • Text layer stays searchable — no visible change
Try PDF Watermarking

Features

Everything you need to prove ownership.

A focused toolset — no enterprise overhead. Built for individual creators and scaled-up teams alike.

Invisible watermarking

Embedded in the frequency domain. Zero visible difference between original and watermarked image.

Image watermarking

Embed an invisible cryptographic watermark into any PNG, JPG, or WEBP file. Verify ownership with the unique key — survives compression, cropping, and screenshots.

New

PDF watermarking

Embed a per-page cryptographic key_id into every page of a PDF. Trace who leaked which copy — survives Save As, screenshots, and printing.

Survives anything

JPEG compression, cropping, rotation, scaling, and most image manipulations. The watermark persists.

Process at scale

Up to 500 images per batch. Drop a folder, set your watermark, and walk away.

RESTful API

Embed, extract, and verify programmatically. Webhook events for every job.

Team-ready

Invite members, manage API keys, and track usage. Role-based access control included.

Encrypted at every step

TLS in transit, AES-256 at rest. SOC2-compliant infrastructure. Your data stays in our secure cloud.

Use Cases

Built for Every Creator and Business

Whether you're an individual photographer or a large enterprise, CopySeal adapts to your workflow.

Protect Your Portfolio

Embed invisible watermarks in every photo you deliver. When someone uses your work without permission, extract the watermark to prove ownership — even after cropping or compression.

    Prove ownership of stolen images
    Track which client leaked a photo
    No visible watermark ruining the image
    Works with RAW, JPEG, and PNG

Photographers workflow preview

Testimonials

Loved by Creators and Businesses

See how CopySeal helps professionals protect their visual content every day.

“CopySeal changed how I protect my portfolio. I had a client repost my images without credit — the invisible watermark proved ownership instantly. Game changer.”
SC

Sarah Chen

Professional Photographer, Chen Studios

“We batch-watermark our entire 10,000+ product catalog. When a competitor copied our images, we extracted the watermark and resolved it in days, not months.”
MR

Marcus Rivera

E-Commerce Director, StyleVault

“As a freelancer, my art is my livelihood. CopySeal's free tier lets me protect every piece I deliver. The watermark is truly invisible — clients never notice.”
EN

Emily Nakamura

Digital Artist & Illustrator, Freelance

FAQ

Frequently Asked Questions

Everything you need to know about CopySeal and invisible watermarking.

CopySeal uses DWT-DCT-SVD frequency-domain embedding. Your watermark text is transformed and embedded into the image's frequency coefficients — invisible to the human eye but extractable with the correct key. The watermark survives JPEG compression, cropping, rotation, scaling, and most image manipulations.

Yes. The watermark is embedded in the frequency domain, not the pixel domain. This means there is zero visible difference between the original and watermarked image. We've tested this with professional photographers who couldn't distinguish between the two.

We support PNG, JPG, JPEG, and WEBP formats. Images can be up to 100 MB with resolutions up to 8192px (or unlimited on Enterprise). The watermark is preserved even when the image is converted between formats.

Absolutely. Images are encrypted in transit (TLS 1.3) and at rest (AES-256 on Cloudflare R2). Free tier images are not stored after processing. Creator images are deleted after 24 hours. Enterprise images persist until you delete them. We're SOC2-compliant.

CopySeal is designed for protecting content you own or have rights to. You should only watermark images where you hold the copyright or have explicit permission. We include a copyright disclaimer in our terms of service.

You can purchase pay-per-use API credits to continue processing. Credits never expire and can be used alongside any plan. Alternatively, you can upgrade your plan for a higher monthly allowance.

Yes. Our RESTful API allows you to embed, extract, and verify watermarks programmatically. Business and Enterprise plans include API access with up to unlimited calls per day. We also support webhooks for automated workflows.

The free tier gives you 5 images per month with no credit card required. You get full access to the embed and extract features, with a max file size of 5 MB and resolution of 2048px. It's perfect for trying CopySeal before committing to a paid plan.

Get started in seconds

Start Protecting Your Images Today

Join thousands of creators and businesses who trust CopySeal to protect their visual content. Free to start, no credit card required.

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No credit card required · 5 free images/month · Cancel anytime