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Lizely

Image Rotator

Rotate a JPG, PNG, or WebP left, right, or 180 degrees locally and download a full-resolution PNG.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Choose a JPG, PNG, or WebP image up to 25 MB and confirm its displayed pixel dimensions.
  2. 2.Select Rotate left 90°, Rotate right 90°, or Rotate 180°.
  3. 3.Inspect the orientation and output dimensions, then download the full-resolution PNG.

About Image Rotator

Image Rotator turns a picture without uploading it to a server. Choose a JPG, PNG, or WebP file, then select a 90-degree left turn, a 90-degree right turn, or a 180-degree turn. The browser decodes the source, creates a canvas with the correct output dimensions, applies the selected coordinate transform, and produces a PNG download. The result panel reports the rotation, pixel dimensions, and file size, so you can verify what was created before saving it. This focused workflow is useful when a phone photo is sideways, a scanned page is upside down, or an asset needs a landscape-to-portrait orientation change.

For quarter turns, width and height swap. A 1200×800 image rotated left or right becomes 800×1200. A 180-degree rotation keeps the 1200×800 dimensions because both axes reverse without exchanging places. The tool does not resize, crop, stretch, or silently lower the resolution. It draws the decoded source at its natural pixel dimensions into an output canvas planned specifically for the chosen angle. The on-page preview is visually constrained by CSS only; the downloadable PNG comes from the full output canvas rather than from a reduced preview.

All image work happens in the current browser tab. The selected file is represented by a temporary local object URL only long enough for browser decoding, then that URL is released. The generated PNG receives its own temporary download URL, which is replaced and released when you rotate again, choose another file, or leave the page. No image content, filename, rotation choice, or output is sent to Lizely. Local processing can be a practical privacy advantage for ordinary photos, draft designs, scans, and screenshots, but you should still inspect the final file before sharing it.

The accepted input formats are JPEG, PNG, and WebP. SVG is deliberately excluded because an SVG can refer to external content and is not simply an ordinary decoded bitmap. The maximum compressed file size is 25 MB, the decoded image is limited to 40 megapixels, and neither side may exceed 20,000 pixels. These are explicit safety limits rather than silent caps: an unsupported, empty, oversized, over-budget, or unreadable file produces a clear message and no stale result remains on screen. Compressed size alone does not predict canvas memory, which is why both file bytes and decoded pixel dimensions are checked.

PNG is used for every download because it gives the browser a consistent, lossless bitmap output after rotation. The PNG may be larger than the original JPEG or WebP even though its pixel dimensions are unchanged or swapped. That is normal: JPEG and WebP often use lossy compression, while PNG preserves the canvas pixels losslessly. Rotation also does not promise to preserve the original file container, EXIF metadata, camera orientation tag, color profile, animation, or embedded text fields. The output is a newly encoded static PNG containing the browser-decoded visual pixels.

The geometry is deterministic. A clockwise turn maps the source top edge onto the output right edge; a counterclockwise turn maps it onto the output left edge; and a half turn maps opposite corners to one another. The production renderer and the isolated tests share the same rotation plan, including output dimensions and canvas affine-transform values. Golden assertions verify the four-corner mappings for a non-square image, which catches common errors such as using the wrong translation, clipping a strip, or rotating around the wrong origin.

For a dependable result, keep the original, rotate a working copy, download the PNG, and open it in the app where you intend to use it. Confirm the orientation, dimensions, transparency, and important edge content. If you need a mirrored image rather than a turn, use Image Flipper. If the orientation is correct but the dimensions are not, use Image Resizer. Image Rotator intentionally performs one operation well and makes its output behavior visible instead of bundling unrelated edits behind automatic choices.

Methodology & sources

The browser validates MIME type and compressed size, decodes the image through a temporary object URL, then rejects invalid dimensions, either side above 20,000 pixels, or decoded images above 40 megapixels. A shared rotation plan determines the exact output canvas size and affine transform for left 90°, right 90°, or 180°. Production passes that transform directly to CanvasRenderingContext2D.setTransform before drawing the natural-size source; isolated golden tests assert dimensions and four-corner mappings from the same plan. The canvas is exported as a full-resolution PNG, while job and mounted-state guards prevent stale asynchronous decode or export work from replacing newer results.

Frequently asked questions

Does rotating reduce the image dimensions?
No. A 90-degree turn swaps width and height, while a 180-degree turn keeps them. The downloadable PNG is drawn at those full output dimensions.
Are my images uploaded?
No. Decoding, canvas drawing, and PNG creation happen locally in your current browser tab.
Why can the PNG be larger than my JPEG or WebP?
PNG uses lossless compression, while JPEG and many WebP files use lossy compression. File size can therefore increase even when the pixel dimensions do not.
Does the output keep EXIF metadata or animation?
No guarantee is made for metadata, color profiles, camera orientation tags, or animation. The result is a newly encoded static PNG of the browser-decoded pixels.

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