Does rotating a PNG by 90° lose any quality?

No. Rotations of 90°, 180°, and 270° are pure pixel transposes — every original pixel ends up in a new (x, y) position with no resampling, no interpolation, and no color shift. The output is mathematically identical to the input, just reoriented. Custom angles like 7° or 45° require resampling to fit the new pixel grid, which causes a small amount of edge softening — typically invisible at viewing size but measurable in a pixel-diff.

Will my PNG's transparent background stay transparent?

Yes. PNG's alpha channel is preserved bit-for-bit during rotation. For right-angle rotations the alpha map rotates with the color channels. For custom angles, the bounding box grows to contain the rotated rectangle and the new corner pixels are filled with fully transparent (alpha = 0) pixels rather than white or any other solid color. This is exactly the behavior the W3C PNG specification defines for RGBA truecolor and grayscale-with-alpha modes.

Why doesn't my PNG auto-rotate the way iPhone JPEGs do?

JPEG files from phones and cameras embed an EXIF Orientation tag (values 1-8) and viewers like Photos, Preview, Chrome, and Windows Photos read that tag and rotate the displayed pixels on the fly. PNG's original 1996 spec had no equivalent tag, so the on-disk pixels are the truth. The Third Edition PNG Recommendation (June 2025) adds an eXIf chunk for embedded EXIF including Orientation, but support across browsers and OS image viewers is still rolling out — most existing PNGs in the wild have no orientation metadata, so a real pixel rotation is the safe fix.

Is PNG actually lossless after I rotate and save again?

For 90° / 180° / 270° rotations, yes — pixels move, the DEFLATE compressor re-encodes, and the decoded output equals the original rotated array. The "Quality Preset" and "Image Quality (%)" controls under Image Compression do not introduce visual loss for pure PNG output; they tune zlib compression level and PNG filter selection. Visual loss only enters if you also reduce color depth (e.g. 24-bit truecolor down to an 8-bit palette under "Image Color Palette"), reduce resolution, or convert to a lossy target like JPEG or lossy WebP.

Can I rotate by an exact angle like 7.5° to straighten a scan?

Yes — enter a custom angle. The tool resamples to fit the rotated bounding box; the canvas grows so no pixels are clipped, and the new triangular corner regions are filled with transparent pixels (preserved when saved as PNG). For best results on text-heavy scans, rotate first and then crop the transparent corners with Crop PNG so the final image has no transparent border.

What's the file size limit and is anything uploaded to a server?

xConvert processes images on our servers for this tool — files are not retained server-side after the conversion completes. Practical size limits depend on upload size and connection speed; a modern laptop comfortably handles screenshots, mockups, and scans up to several thousand pixels per side. For very large composites consider downscaling first via Resize PNG before rotating to keep memory use reasonable.

Will my PNG get bigger after rotation?

For 90° and 270° rotations, output size is usually within a few percent of the input — the same pixels are present, but DEFLATE's row-based filtering may compress slightly better or worse depending on whether the dominant gradients run horizontally or vertically. 180° rotations almost always land at near-identical size. Custom-angle rotations can grow by 10-30% because the bounding box expands and the new transparent corners add pixels (though transparent regions compress very well).

Can I rotate multiple PNGs in batch with the same angle?

Yes. Add multiple files at the upload step; the rotation angle and compression settings apply to all of them. This is useful for rotating a folder of screenshots from a sideways recording session, a set of scanned pages, or a sprite sheet exported with the wrong axis convention. If you need to convert formats afterward, Convert PNG to JPG and Convert PNG to WebP chain naturally after a rotate-and-batch step.

Does this work the same for indexed-color PNG-8 and truecolor PNG-24?

Yes — both pixel formats rotate identically. PNG-8 stores up to 256 colors via a PLTE palette chunk plus optional 1-bit or 256-entry tRNS transparency; PNG-24 stores 8-bit RGB; PNG-32 adds an 8-bit alpha channel for full RGBA. Right-angle rotations preserve the palette and bit depth exactly. Custom-angle rotations on a PNG-8 may need to upgrade to PNG-32 internally because the new transparent corner pixels can't be represented in a 1-bit transparency map — the saved file will be slightly larger as a result.

Rotate PNG

Rotate PNG images online for free. Fix orientation of screenshots and design assets — transparency preserved.

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