画像形式解説：PNG、JPG、WebP、HEIC—完全ガイド 2026
新着2026-02-011分で読めます3ツール
主要画像形式の完全ガイド。用途に合った形式を選ぶ。
PNG: Transparency and High Quality
PNG supports transparency and lossless compression. Ideal for logos and graphics. Downside: large file size for photographs.
JPG: Compatibility and Small Size
JPG is the most universally compatible format. Lossy compression reduces size. Ideal for photos and websites.
WebP: Google's Modern Format
WebP combines benefits of PNG and JPG. 25–35% smaller than JPG. Some older programs don't support it.
HEIC: iPhone's Format
HEIC from Apple saves 50% space. iPhones capture in HEIC by default. Often needs conversion to JPG for compatibility.
Frequently Asked Questions
- Which format is best for web?
- WebP for speed, JPG for maximum compatibility.