ガイド
アップロード前にブログ画像を最適化する方法
ブログ画像を軽くしつつ見やすさを保つ、公開前チェック手順です。
元画像をそのまま投稿すると記事が重くなりがちです。公開前の短い最適化で読みやすさと速度を両立できます。
Set a target width per content block
Define a default width for hero images and inline images.
This avoids random image sizes across posts and reduces file waste.
Pick format by content type
Use JPG/WebP for photos and PNG for diagrams needing crisp edges or transparency.
Avoid using one format for everything just out of habit.
Compress with readability in mind
Blog screenshots must keep text readable after compression.
Test a small quality range and keep the lightest acceptable version.
- Check text labels at normal zoom.
- Review mobile view once.
- Avoid aggressive compression on charts.
Rename and organize files before upload
Use clear file names so your media library stays maintainable.
Consistent naming also helps when replacing old files later.
Preview the post before publishing
Open the draft on desktop and mobile to confirm quality and loading.
If an image still looks heavy, optimize that file again before publishing.
Use this when
- Publishing tutorials with screenshots.
- Preparing long-form blog posts.
- Improving mobile readability.
- Updating older slow articles.
Optimize once, publish faster
A 2-minute image check before uploading prevents most blog image performance issues.