How to Rotate a Picture That Saved Sideways (and Make It Stay That Way)

A phone's camera sensor is mounted in one fixed position, almost always landscape. Hold the phone upright for a portrait shot and the sensor still captures a landscape frame with the subject lying on its side. Rather than rotate twelve million pixels, most camera apps write the frame as captured and add one number to the file's EXIF metadata, the Orientation tag, set from the accelerometer as you shoot. It costs nothing and loses nothing.

The tag has eight possible values, but cameras realistically write four; 2, 4, 5 and 7 are mirrored variants that almost never come out of a camera. A phone photo tagged 6 or 8 is sideways on disk and only looks upright because something reads the tag and turns it on the fly. The number tells a viewer how far to turn the stored pixels before showing them:

Honoring the tag is optional, and software is split. Your phone gallery, current browsers and most photo managers read it and turn the image before showing it; older desktop viewers, many server-side thumbnail generators and code that reads the pixel grid directly do not. Desktop browsers only began applying the tag to ordinary images in 2020, and image libraries such as Pillow, ImageMagick and sharp still ignore it unless explicitly asked.

The gallery rotate button adds a second trap. Some apps fix a sideways photo by rewriting only the Orientation value; on that phone the problem looks solved, but send the file anywhere that ignores the tag and it is sideways again. Others rotate the pixels and re-save, and you cannot tell from outside which you got.

The fix that holds everywhere does both jobs at once: it rotates the pixels so the top of the scene is physically at the top of the grid, and saves a new file whose orientation does not depend on metadata. A browser tool that draws your photo onto a canvas and exports the result does exactly that: the export contains pixels only, with no EXIF block left to disagree with them.

Drag a JPG, PNG, WEBP or GIF onto the rotate-image tool's Upload an Image box, or click it to pick a file. The photo appears in the Preview panel, and a current browser shows it the way its Orientation tag says, so a correctly tagged phone photo often looks upright before you touch anything.

If it already looks upright in the Preview but keeps arriving sideways elsewhere, do not rotate it; download it as it is. The export is drawn from the pixels you see and written without EXIF data, which bakes the orientation into the image and removes the tag other software was ignoring. The same holds after a 90° fix: the saved file is upright on disk, not upright by instruction.

Two consequences follow. Everything happens inside the browser tab, so the photo is never uploaded anywhere; and because the output is a fresh canvas export, the original's camera model, capture date and GPS location are not carried over. The controls beside the Preview:

A crooked horizon or a skewed scan needs the Fine Angle slider, not the buttons. Drag right to tilt clockwise and left for counter-clockwise, in whole-degree steps; there is no half-degree setting. The Preview turns the picture inside a fixed box, so after a turn or tilt its edges can run past the visible area; that clipping exists only in the preview, and nothing is cut off in the download.

The download grows the canvas instead. A tilted rectangle needs a bigger rectangle to hold it: the output width is the original width times the cosine of the angle plus the original height times the sine, the height is the mirror of that, and both are rounded to whole pixels. The empty triangles around the photo are filled with whatever the format can express: transparency for PNG and WEBP, solid black for JPG, which has none.

A 90° or 180° turn moves every pixel to a new whole-number position without blending it with its neighbors, so a PNG comes back with the same pixels in new places. Any other angle lands pixels between grid positions and the browser interpolates, softening fine edges very slightly, here and in every other editor. Keep the angle as small as the picture allows, then crop the wedges away for clean edges. This is what a 4000 × 3000 photo becomes at each setting:

Flipping mirrors the picture across an axis; rotating turns it around its center. A sideways photo is a rotation problem: flip it horizontally and it is still sideways, just mirrored. A reversed selfie where a T-shirt slogan reads backwards is a flip problem, fixed by Flip Horizontal; no amount of rotating will un-reverse the letters.

The one place the two overlap is 180°: turning a picture upside down equals flipping it horizontally and vertically together. Flip Vertical alone is not a 180° turn: text still reads left to right but hangs upside down. In the rotate-image tool a flip and a rotation can be active at once; the flips are applied first and the angle second, in both the Preview and the download, so what you see is what you get.

The tool returns the format it was given: JPG in, JPG out, likewise PNG and WEBP; the difference is what re-saving costs. PNG is lossless, so a right-angle turn is a perfect copy. JPG is lossy and every save re-encodes the whole image; here that happens at quality 95, high enough that one generation is invisible at normal viewing size, but still a generation; the file can come out larger or smaller than the original depending on the camera's own compression. WEBP is re-encoded too, at the same quality setting. Rotate once, download once.

For transparent corners rather than black ones on a straightened photo, convert the JPG to PNG first; the wedges can then be left or cropped later, at the cost of a much larger file. A few more limits: