BMPを回転
Turn or mirror BMP in ninety-degree steps — a lossless edit that rearranges pixels rather than redrawing them. ブラウザ内で動作 — アップロード不要、登録不要、完全にプライベート。
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This page rotates BMP. Turning an image is one of the few edits that is completely lossless when done in 90-degree steps, because the pixels are rearranged rather than recalculated.
How it works
- Add your BMP file.
- Rotate left or right in 90-degree steps, or flip horizontally or vertically.
- Watch the preview until the orientation is right.
- Download the corrected image.
Good to know
Photos often look rotated because of an EXIF orientation flag rather than the pixels themselves. Rotating here writes the correct orientation into the actual image data, so it displays the same way everywhere.
Frequently asked questions
Does rotating BMP reduce quality?
Rotating by 90, 180 or 270 degrees rearranges existing pixels without resampling, so there is no quality loss at all. Arbitrary angles do require resampling and will soften edges slightly.
Why did my photo appear sideways in the first place?
The camera recorded the orientation as metadata rather than rotating the pixels. Some apps honour that flag and some ignore it, which is why the same file can look upright in one program and sideways in another.