🖼️ 图片工具Image Tools （第 2 页）(page 2)
手写签名提取（去白底透明）Signature Extractor (Transparent Background)
把纸上手写签名的照片变成透明背景的 PNG：自动去掉白纸和阴影，可调节阈值、改成黑色或蓝色墨迹、自动裁掉空白，生成的电子签名可直接放进 Word、PDF 或合同。Turn a photo of a handwritten signature into a transparent PNG: paper and shadows are removed automatically, you can tune the threshold, recolour the ink black or blue and auto-crop the margins — ready for Word, PDF or contracts.
格子纸生成器（方格/田字格/米字格/横线/点阵）Grid Paper Generator
生成可打印的练习纸：方格纸、坐标纸、田字格、米字格、横线纸、点阵纸和英语四线三格，可设置格子大小、线条颜色和纸张尺寸，下载矢量 PDF 或高清 PNG 直接打印。Make printable practice paper: square grid, graph paper, Chinese tian/mi character grids, lined, dot grid and English handwriting lines.
WBMP 图片转换（PNG/JPG ⇄ WBMP）WBMP Converter (PNG/JPG ⇄ WBMP)
把 PNG、JPG 等图片转换成 WAP 时代的 WBMP 黑白位图（可选阈值或抖动），也能打开 .wbmp 文件预览并转回 PNG，常用于老式功能机、单片机和点阵屏开发。Convert PNG, JPG and other images to the 1-bit WBMP format from the WAP era (threshold or dithering), or open .wbmp files to preview and convert them back to PNG — handy for feature phones, microcontrollers and dot-matrix displays.
CSS 雪碧图生成器CSS Sprite Generator
把多个小图标合并成一张雪碧图（CSS Sprite），自动生成每个图标的 background-position 样式类，可选择横排、竖排或网格排列和间距，支持 2 倍图（Retina），下载 PNG 和 CSS。Merge many small icons into one CSS sprite sheet and get a class with background-position for each icon.