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Đổi DPI ảnh

Đổi DPI của ảnh

Chạy trong trình duyệt · Không tải lên

Hiện tại công cụ này và hướng dẫn trên trang vẫn bằng tiếng Anh. Nó hoạt động y như vậy: mọi thứ chạy trong trình duyệt của bạn.

Drag & drop images here

or

JPG, PNG, WebP, AVIF, GIF, BMP, TIFF, SVG, HEIC or PSD/PSB · one or many

Your files stay on your device. Nothing is uploaded.

  • Không có gì rời khỏi thiết bị của bạn
  • Máy chủ không giới hạn kích thước
  • Không đăng ký, không hình mờ
  • Miễn phí

How to change the DPI of an image

  1. Choose your JPG or PNG images.
  2. Pick 300 DPI, another common value, or type your own.
  3. Press Set DPI and download. Each result shows the size it will print at.

What DPI really means

DPI only tells printers and layout apps how big to print the image. A 3000 × 2000 pixel photo prints 25.4 × 16.9 cm at 300 DPI, or 105.8 × 70.6 cm at 72 DPI. The pixels, and so the sharpness, stay exactly the same.

If a print shop asks for "300 DPI", check that the print size shown is at least as large as your print. If it is smaller, the image needs more pixels, and changing the DPI won't add detail.

What this tool changes

  • JPG: the DPI in the JFIF header, the EXIF resolution and Photoshop's resolution info, so Windows, macOS, Photoshop, Word and InDesign all see the same value.
  • PNG: the pHYs chunk that stores the physical pixel size.
  • Nothing else: the image data is copied byte for byte, with no re-compression.

Your images stay on your device

Everything happens in your browser. Your images are never uploaded, so private photos and client work stay with you.

Câu hỏi thường gặp

Does changing DPI make my photo sharper?

No. DPI is only a label for the print size. To print larger at the same sharpness you need an image with more pixels.

Why only JPG and PNG?

They are the formats where printers and layout apps reliably read a DPI value. Convert other images to JPG or PNG first with the Image Converter.

Is the quality reduced?

No. Only the DPI fields are rewritten; the pixels are not touched or re-compressed.

Are my images uploaded?

No. They are processed in your browser and never sent anywhere.