Watermark ID cards and documents
Mark copies of ID cards, certificates and portraits with phrases like "BẢN SAO" so they cannot be reused elsewhere.
🔒 100% Secure & Private: All watermark processing occurs instantly within your browser local RAM. Your commercial assets are never transmitted to any external server.
Drag & drop your images here
or browse files. JPG, PNG and WebP up to 50 MB each.
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Sizes are relative, so the watermark looks the same on every image whatever its resolution.
Your images never leave this device.
Watermark ID card and document copies
Copies of ID cards, passports and certificates are routinely sent for job applications, rentals, SIM registration and account verification, and leaked copies are a common route to identity fraud. Marking each copy with its purpose, such as "BẢN SAO" or "CHỈ DÙNG ĐĂNG KÝ TUYỂN DỤNG", makes it far harder to reuse anywhere else.
The tiled pattern repeats your phrase diagonally across the whole document, so it cannot be cropped out, while a low opacity keeps every detail legible for the person who needs to verify it. Because processing happens in your browser, your documents are never uploaded.
What to write on a document copy
- Who the copy is for and why, for example "CHỈ DÙNG NỘP HỒ SƠ CÔNG TY ABC".
- The date, using the Date button, so an old copy cannot be reused later.
- Make sure the pattern crosses the photo and the ID number while staying readable.
Your photos never leave your device
Watermarking usually happens right before publishing, while photos are still unreleased product shots, client work or personal documents. Upload-based tools copy those files to someone else's server. Here every image is decoded, stamped and saved inside your browser's memory, and nothing is uploaded. Output keeps the exact original pixel dimensions, and camera metadata such as GPS location is removed from the exported files.
Frequently asked questions
What should I write on a copy of my ID card?
Include the purpose and the date, for example "ONLY FOR VERIFICATION WITH COMPANY ABC - 08/10/2026". A copy marked like this is useless for any other purpose.
Will the recipient still be able to read my document?
Yes. At around 30% opacity the watermark is clearly visible, while names, numbers and the photo underneath stay legible.
Is it safe to watermark my ID card online?
With this tool, yes: the image is never uploaded, and all processing happens in your browser memory. Avoid any service that sends identity documents to its servers.
Is a watermarked copy legally valid?
A watermarked scan is meant for identification and verification, not as an official certified copy. If an organization requires a certified copy, you still need to obtain one from the authorities.