圖像轉換軟件


How to Reduce Image File Size

Set a target image size, calculate the required reduction, and follow a practical sequence for resizing, format conversion, and quality control.

File-size savings planner

Set a smaller image target

Estimate the reduction needed per image and the bandwidth saved across repeated website views.

Required reduction80.0%

1.17 MBsaved per image
11.44 GBmonthly bandwidth saved
Use dimension resizing first, then WebP/AVIF or controlled JPG quality to reach this aggressive target.

Reduce file size in the right order

Resize dimensions first

Avoid serving more pixels than the largest displayed size requires.

Choose an efficient format

Use WebP or AVIF for modern delivery, with a suitable fallback when needed.

Tune quality last

Lower quality gradually and inspect text, edges, faces, and gradients.

它是如何運作的

  1. 1

    輸入您的要求

    提供檔案大小或選擇網站圖像特徵。

  2. 2

    查看結果

    閱讀計算出的節省額或建議的格式和理由。

  3. 3

    下載決定

    儲存內容或優化工作流程的結果。

Seven ways to make an image smaller

Crop unused areas, resize pixel dimensions, remove metadata, choose a suitable format, lower lossy quality carefully, use responsive image sizes, and avoid repeated re-encoding. The largest gains usually come from dimensions and format before aggressive quality reduction.

線上調整影像大小在線壓縮圖像

常見問題

What reduces image file size the most?

Reducing unnecessary pixel dimensions and using an efficient delivery format usually create the largest gains.

Does reducing file size reduce quality?

Not always. Lossless optimization and metadata removal can reduce size without visible quality loss, while lossy settings trade detail for smaller files.

Should I compress before resizing?

Resize to the required dimensions first, then compress the resized output.

How to Reduce Image File Size last reviewed: Jul 18, 2026.