Drag four corner handles onto any rectangular subject and apply GPU-accelerated perspective correction in one tap \u2014 fully offline, no account required.\n\nPERSPECTIVE CORRECTION\nPlace four corner handles around any flat rectangular subject: a building facade, a whiteboard, a product flat-lay, or a scanned document page. Nudge individual corners one pixel at a time with arrow keys for precise placement. Auto-crop removes the empty borders left by the correction, and a 20-step undo/redo stack keeps every adjustment reversible.\n\nAUTO-DETECT DOCUMENTS AND WHITEBOARDS\nOne tap runs on-device rectangle detection and snaps all four handles to the largest document, whiteboard, or page edge in the photo. Fine-tune from there with the arrow keys or the loupe magnifier \u2014 no manual corner placement needed for clean rectangular subjects.\n\nLOUPE MAGNIFIER\nA circular magnifier with a crosshair and soft shadow appears while dragging any corner handle, showing the pixel under the cursor at close range. Aligning corners on text edges, picture frames, and architectural lines becomes exact even on high-resolution images.\n\nKEYSTONE LOCK MODES\nThree constraint modes control how opposite corners move together. Free mode moves each corner independently. Vertical Lock keeps the left and right edges parallel \u2014 corrects converging verticals on tall buildings and tower shots. Horizontal Lock keeps the top and bottom edges parallel \u2014 corrects off-axis whiteboards, signs, and posters.\n\nHORIZON STRAIGHTENING\nA rotation slider from \u221245\xb0 to +45\xb0 levels a tilted horizon without cropping. Combine it with the four-corner grid for complete geometric control over any image.\n\nCOLOR AND TONE INSPECTOR\nNine independent sliders \u2014 saturation, brightness, contrast, exposure, gamma, hue, vibrance, sharpness, and noise reduction \u2014 provide precise tonal control. One-tap Auto-Enhance applies a balanced correction across the primary tonal adjustments as a starting point.\n\nALIGNMENT GRID OVERLAYS\nSix grid overlays assist with composition and alignment throughout the edit: Rule of Thirds, Golden Ratio, 4\xd74, 5\xd75, Diagonal, and None. Four guide overlays \u2014 Crosshair, Rulers, Dimensions, and None \u2014 provide spatial reference during corner placement.\n\nBEFORE AND AFTER COMPARISON\nThree comparison modes let you check the edit at any stage: horizontal wipe, vertical wipe, and side-by-side. Toggle between them without altering the corrected result.\n\nEXPORT CONTROL\nChoose from five output formats: JPEG, PNG, HEIC, TIFF, and WebP. A quality slider controls fidelity-to-size balance for lossy formats, with an estimated file-size preview. A results panel lists every exported file with a Show in File Explorer button.\n\nCANVAS AND WORKFLOW\nZoom from 0.1\xd7 to 10\xd7 and pan freely across the canvas. Rotate in 90-degree increments and flip horizontally or vertically. Paste images directly from the clipboard \u2014 screenshots, copied web images \u2014 without opening a file dialog. Fullscreen preview mode removes all UI chrome for an unobstructed look at the final result.\n\nEXIF INFORMATION PANEL\nThe built-in metadata panel shows file creation date, file size, content type, and EXIF metadata for the open image.\n\nALL PROCESSING LOCALLY\nEvery operation \u2014 perspective correction, tone adjustment, export \u2014 runs locally using GPU acceleration. No account, subscription, or internet connection is ever needed.\n\nDESIGNED FOR\n\u2022 Architectural photographers correcting converging verticals and leaning facades\n\u2022 Designers preparing product flat-lays and catalog images\n\u2022 Anyone digitising scanned documents, whiteboards, or printed pages