SZ Paint - Free Online Image Editor with Layers, Effects, and Selection Tools

A Paint.NET-class bitmap editor with multi-layer compositing, 12 blend modes, 16 drawing tools, mask-based selection with marching ants, image adjustments with live preview, 30+ effects including blur, distort, and stylize filters, and 40+ advanced image resizing algorithms.

Features

• Layer system with opacity, 12 blend modes, visibility toggle, reorder, merge, duplicate, and flatten
• 16 drawing tools: pencil, line, rectangle, ellipse, rounded rectangle, polygon, bezier, eraser, fill, gradient, text, color picker, airbrush, clone stamp, blur brush, and sharpen brush
• Mask-based selection: rectangular, lasso, and magic wand with add, subtract, and intersect modes and marching ants
• Image adjustments with live preview: brightness/contrast, hue/saturation, levels, invert, grayscale, sepia, and auto levels
• 30+ effects: Gaussian blur, sharpen, noise, pixelate, edge detect, emboss, motion blur, radial blur, surface blur, swirl, spherize, ripple, oil painting, posterize, halftone, crystallize, and more
• 40+ image resizing algorithms including pixel art scalers (Eagle, EPX, HQ, XBR, xBRZ, SAI, MMPX) and kernel resamplers (Lanczos, Bicubic, Mitchell, Spline)
• Auto-correct tools: auto-deskew, auto-rotate, and auto-keystone perspective correction
• Full undo/redo (30 steps), clipboard operations, and comprehensive keyboard shortcuts