Want to print the precious photos on your mobile phone and paste them on the wall as a poster? The result is not good because the pixel quality is too low? Don’t worry! This article will guide you on how to enlarge a picture to print in high quality, whether it's for the clear output of a single photo or for enlarging a picture and printing on multiple pages.

Part 1: Why Need to Enlarge a Picture to Print

When we convert digital images into physical photos, the process of enlargement is a crucial step in ensuring the quality of the prints. This is mainly due to the following 2 reasons:

Different resolution standards

A digital screen only requires 72-100 PPI to maintain clarity, while for professional printing, a pixel density of 300 PPI is needed. This means that the accuracy standards for viewing the same image on a screen and for printing it on paper are completely different.

Physical size limitations

Let's take a 4000×3000 pixel photo as an example.

When it is displayed on the screen, its details can be fully presented.

However, if it is directly printed according to the 300 PPI standard, only a clear image of 13×10 centimeters can be obtained. But if you want to print it on an A4 size (29.7×21 centimeters), then pixels must be supplemented through enlargement.

Part 2: Why Can’t I Simply Resize a Picture for Printing

Why can't we simply resize the image on the computer? Because simple resizing will cause pixel diffusion and result in blurring, which is a destructive enlargement:

1. Simple resizing merely stretches the pixels, rather than adding more details. Simple resizing merely converts the original pixel points of the image into larger color blocks. The image will become blurry and have jagged edges. This is similar to enlarging a mosaic mural; you will only see thicker mosaic squares.

2. Unable to meet the printing precision requirements. High-quality printing requires a resolution of at least 300 DPI. Manual resizing the low-pixel image forcefully will result in a decrease in its actual DPI - far below the standard for clear printing, which can cause the image to become blurry or distorted.

Therefore, we have to rely on professional enlargement tools.

Part 3: How to Enlarge a Picture for Printing Without Losing Quality

In fact, there are many professional tools available online that can achieve lossless enlargement of images. Here, we would like to introduce a free online tool - Apeaksoft無料画像アップスケーラー 理由は以下のとおりです。

• Using AI technology to enlarge a picture automatically with one click.

• It can predict details intelligently, avoiding awkward jagged edges or blurriness.

• Enlarge a picture for printing without losing quality.

• Batch enlarge pictures for printing at a time.

• No ads, no virus, no download needs.

Here, we list detailed steps to show you how to enlarge a picture for printing online:

ステップ 1： ロケーション選択 Apeaksoft無料画像アップスケーラーのウェブサイト

ステップ 2： 写真をアップロードする button and choose your pictures.

ステップ 3： Choose the magnification based on your needs.

ステップ 4： Save ボタンを押して終了します。

Part 4: Professionally Enlarge a Picture Before Printing Using Photoshop

If you are looking for more professional methods of enlargement or if you are accustomed to using Photoshop to process images, please read the following steps on how to enlarge a picture for printing on Windows 10 or Mac:

ステップ 1： Open your target image in Photoshop.

ステップ 2： 詳しくはこちら Image - Image Size 上部のメニューバーにあります。

ステップ 3： クリック リサンプル option in the pop-up window and choose 詳細を保持 ドロップダウンリストに表示されます。

ステップ 4： Enter the size in the box to 画像ピクセルのサイズを変更する、[OK]をクリックします OK.

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