अवधारणा और ज्ञान केंद्र
PDF और छवि घुमाव टूल (90°, 180°, 270°)
PDF और छवि घुमाव टूल (90°, 180°, 270°)
यह टूल 100% आपके ब्राउज़र में सुरक्षित रूप से चलता है। आपकी छवियां, वीडियो, ऑडियो या PDF फाइलें कभी भी किसी बाहरी सर्वर पर अपलोड नहीं होती हैं; सभी कार्य आपके डिवाइस की मेमोरी में सुरक्षित रूप से होते हैं।
मूल वास्तुकला और गणितीय सूत्र
Affine Transform = [cos(θ), sin(θ), -sin(θ), cos(θ), tx, ty]
Where θ is the rotation angle in radians, and tx/ty are the translation offsets required to keep the rotated content within the visible canvas bounds. For 90° and 270° rotations, the output dimensions (width and height) are swapped.
सर्वोत्तम अभ्यास और आवश्यक दिशानिर्देश
- Understand Lossless PDF Rotation: PDF page rotation modifies only the page's /Rotate dictionary entry. The actual content streams (text, vectors, embedded images) are not re-encoded, making this a metadata-only, zero-quality-loss operation.
- Swap Dimensions for 90°/270°: When rotating an image by 90° or 270°, the output canvas must swap its width and height dimensions. A 1920×1080 landscape photo becomes a 1080×1920 portrait image after a 90° rotation.
- Check Scanner Settings First: If you frequently receive sideways scans, configure your scanner's auto-orientation detection (available on most modern scanners) rather than correcting every document after the fact.
अक्सर पूछे जाने वाले प्रश्न (FAQ)
Does rotating a PDF reduce its quality or increase file size?
No. PDF rotation is a lossless metadata operation. The tool modifies the page's rotation property in the PDF dictionary without touching the actual content streams, so file size and quality remain identical.
Can I rotate individual pages of a multi-page PDF?
The current tool rotates all pages by the same angle. For per-page rotation, use the PDF Splitter to extract the target page, rotate it individually, then merge it back into the original document.
What image formats are supported for rotation?
Any format your browser can render: JPEG, PNG, WebP, GIF, BMP, AVIF, and SVG raster. The output is always PNG to preserve maximum quality and transparency.