PerspectiveFix corrects perspective distortion in photographs. You draw lines along edges that should be straight, and the app computes a correction so those edges become truly vertical or horizontal. The corrected image is then cropped and saved.

Everything happens on your device. No images are uploaded anywhere.

Tap Load Image at the top of the menu (☰) to open the image picker. You can choose from your Photos library, take a new photo, or browse Files. TIFF gives the best quality output; JPEG and PNG also work.

In Draw mode, drag your finger along a straight edge in the photo — a door frame, wall edge, window, horizon. The line type is set automatically: steep lines become Vertical (gold), shallow lines become Horizontal (blue).

You can draw up to 2 vertical and 2 horizontal lines. More lines give a more accurate correction. Even a single line straightens the image on that axis.

The 10×10 grid helps you judge alignment as you work.

Switch to Edit mode to fine-tune line positions. Endpoint circles appear at each end of every line — drag them to reposition. Edit mode is only available after at least one line is drawn.

Use ↩ Undo and ↪ Redo in the menu to step through line history. ✕ Clear removes all lines after a confirmation.

Tap Apply in the toolbar. The app computes a full-resolution perspective warp based on your reference lines. This may take a moment on large images.

You'll enter the crop stage, where the corrected image is shown with a crop box.

The crop box is auto-placed at the largest rectangle that fits inside the corrected image with no blank edges. A rule-of-thirds grid and center crosshair help with composition.

Drag inside the box to reposition it. Drag a corner circle to resize. Tap ☰ to change the aspect ratio or output format.

Blank areas outside the crop (from the warp) appear as a checkerboard for TIFF/PNG output, or black for JPEG.

Tap Save. A sheet appears — tap Share… to open the iOS share sheet. From there you can save to Photos, Files, AirDrop, Messages, and more. To save to Photos, tap the share sheet's "Save Image" option.

After saving, tap Load Image in the menu to process the next photo.

TIFF — lossless with transparency. Best quality, largest file. Recommended for further editing in apps like Affinity Designer or Photoshop.

PNG — lossless with transparency. Smaller than TIFF, no quality loss.

JPEG — compressed. Smallest file. Quality slider 70–100. Good for sharing or when file size matters.

Tap ⚙ Settings in the menu to adjust toolbar size, contrast, workspace background, and the "keep lines" batch processing option.

PerspectiveFix runs entirely on your device. No images, lines, or settings are ever sent to a server. The app works with no internet connection after the initial page load.