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Add a watermark to PNG

Đóng tên hoặc logo của bạn lên ảnh PNG.

Trả lời nhanh

To watermark a PNG, upload it to ezimagetools.com, type the text you want stamped on it or upload a logo, then set the position, size and transparency. Tiling repeats the mark across the whole picture, which is far harder to crop out than a single corner mark. PNG keeps a watermark crisp: text and logo edges stay sharp instead of picking up the soft halo a lossy format gives them. Free, and no account is needed.

Tổng quan

Định dạng hỗ trợ
PNG files, plus a PNG logo if you are using one
Kết quả nhận được
The same PNG with the watermark permanently applied
Kích thước tệp tối đa
50 MB mỗi tệp
Số tệp mỗi lượt
Tối đa 20 tệp mỗi lượt
Giá
Miễn phí, không giới hạn số ảnh xử lý
Cần tài khoản
Không — không cần đăng ký
Tệp của bạn bị xoá
Tự động, trong vòng một giờ sau khi xử lý

Cập nhật 2026-08-31

Cách đóng dấu png

  1. Add your PNG

    Tap the upload box and choose the PNG you want to protect.

  2. Write your mark

    Type the text, or upload a logo. A PNG logo with a transparent background works best.

  3. Place it

    Choose a corner or the centre, set the size and transparency, or switch on tiling to repeat it.

  4. Apply and download

    Press Watermark, then save the marked PNG.

What a PNG is

PNG stores every pixel exactly as it was and is the common format that supports transparency. That makes it the right choice for screenshots, logos and flat graphics, and a wasteful one for photographs.

A watermark is a deterrent, not a lock

A visible mark makes casual reuse obvious and inconvenient, which is most of what it is for. It will not stop someone determined to edit it out. If the picture must not be copied at all, do not publish it at full resolution.

Câu hỏi thường gặp

Why watermark a PNG?

PNG keeps a watermark crisp: text and logo edges stay sharp instead of picking up the soft halo a lossy format gives them. For a logo mark it is the better format to start from.

How do I stop someone cropping my watermark off?

Switch tiling on. A single mark in a corner takes one crop to remove; a mark repeated across the whole picture cannot be cropped out without destroying the image. Keep the transparency moderate so it is visible but not ruinous.

Can I use a logo instead of text?

Yes. Upload a PNG with a transparent background and it is placed exactly like a text mark — same positions, same size and transparency controls. A JPG logo will bring its own white box with it, which is why PNG is the right format for this.

Is the watermark permanent?

Yes. The pixels of the PNG are rewritten, so there is no layer anyone can switch off. Keep a copy of the unmarked original before you start — we do not keep one for you.

Does watermarking change the size of the picture?

No. The width and the height stay exactly as they were; only the pixels under the mark change. The file size shifts a little because the picture itself has changed.

Is it safe to watermark PNG files online?

Yes. Your file is processed on our server and deleted automatically within one hour. We never look at it and you do not need an account.

Your images are processed on our server and deleted automatically within one hour. We never look at them and you do not need an account.

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