在线工具Online tools

浏览器本地把 PNG 转成 JPG，文件不上传服务器。Convert PNG to JPG entirely in your browser — nothing is uploaded.

浏览器本地把 JPG/JPEG 转成 PNG。Convert JPG/JPEG to PNG entirely in your browser.

把 WebP 转成更通用的 JPG 或 PNG，本地完成。Convert WebP to widely-supported JPG or PNG — local only.

降低图片体积，尽量保留观感。浏览器本地处理。Shrink image size while keeping visual quality. Local processing.

自动逼近目标大小，尽量不超过 100KB，并保留尽可能高的质量。Automatically approach 100KB without exceeding it, keeping the highest possible quality.

报名照、头像等场景：自动压到约 20KB 以内。For avatars and form uploads: approach 20KB automatically.

自动逼近 50KB，不超限，尽量保质量。Approach 50KB without exceeding the limit.

自动逼近 200KB 上限。Approach a 200KB cap automatically.

自动逼近 500KB 上限。Approach a 500KB cap automatically.

按像素改宽高，可保持比例。本地处理。Change width/height in pixels, optionally keep aspect ratio.

通过本地重编码去掉 GPS、设备、拍摄信息，保护隐私。Strip GPS, device and capture metadata by re-encoding locally.

计划引入 heic2any WASM，仅在本页动态加载。Planned: heic2any WASM, dynamically loaded on this page only.

用 Magic Bytes 判断真实类型，不轻信扩展名。Detect real type via magic bytes — never trust the extension alone.

在浏览器计算文件哈希，用于校验完整性。Compute file hashes in the browser to verify integrity.

逐字节 / 哈希对比，判断两个文件是否一模一样。Byte-level / hash compare to see if two files are identical.

美化、压缩 JSON；常见语法错误给出可读说明。Pretty-print or minify JSON; explain common syntax errors.

Unix 秒/毫秒与可读时间互转，支持本地时区。Convert Unix seconds/ms ↔ human time in your local timezone.

输入链接或文本，本地生成二维码图片。Generate a QR image from text or a URL — locally.

计划接入 jsQR，上传图片解析内容。Planned: decode QR from an image with jsQR.

计划用 pdf-lib 本地合并，不上传。Planned: merge PDFs with pdf-lib entirely in-browser.

计划用 pdf-lib 按页拆分。Planned: split PDFs by page with pdf-lib.

计划本地压缩（复杂 PDF 能力有上限，将诚实标注）。Planned local compression (honest limits for complex PDFs).

计划用已有 jspdf 依赖本地生成。Planned: build PDF from images with existing jspdf.

计划用 pdfjs 渲染页面后导出。Planned: render pages with pdfjs then export.

用 81 数灵动数体系拆解随身号码的组合含义（民俗参考）。Break down everyday numbers with the 81-number folk energy system (reference only).