BMP は Windows の無圧縮ビットマップです。構造が単純で編集しやすい反面、ファイルが非常に大きくなります。レガシーな印刷・産業ソフトで今も使われます。
Typical use: 容量を減らしたい、Web で使いたいときは BMP を PNG や JPG に変換します。
About the BMP format
BMP は無圧縮のビットマップ形式です。構造が単純で画素をそのまま読めるため、画像処理の教材やレガシー機器で今も使われます。
圧縮しないぶん容量は大きく、Web や共有には向きません。扱いやすさを優先して PNG へ変換するのが一般的です。
Strengths
- ✓ 構造が単純で読み書きしやすい
- ✓ 画素をそのまま保持
- ✓ レガシー機器と相性が良い
Limitations
- ✗ ファイルが非常に大きい
- ✗ 透明や圧縮に弱い
- ✗ No role in modern web or print workflows
- Compression
- Usually none (RLE optional)
- Transparency
- Rarely (V5 header only)
- Animation
- Not supported
- Metadata
- Minimal
- Best for
- Legacy software and scanner output
Convert BMP to…
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Frequently asked questions
What is a BMP file?
BMP is Windows’ native uncompressed bitmap format. Every pixel is stored exactly as captured, which makes files large but trivially simple to read — common in older software and scanners.
How do I convert BMP files online?
Pick a target format from the "Convert BMP to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert BMP files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can BMP convert to?
This page lists all 69 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.