免费的在线工具合集，满足日常工作流需求。

二维码、PDF、转换器、倒计时等。免注册、免安装，开箱即用。

JW工具箱提供50多款免费在线工具：涵盖PDF处理、二维码、密码生成和格式转换等。所有工具均在您的浏览器中本地运行，保护隐私，拒绝服务器上传。

精选工具

这里收录了当前在 JW Tool Box 上已发布、最常用的一批浏览器工具。

• QR码生成器 (免费, 高清, 无限制)

  即时创建高对比度、易扫描的二维码，适用于网址、Wi-Fi和文本。

• PDF压缩工具（减小体积、优化、瘦身）

  在浏览器中压缩 PDF，并通过质量预设平衡体积与清晰度。

• PDF合并工具 (拼接, 整合, 文档)

  将多个PDF文件合并为一个文档。

• PDF拆分 (提取页面, 分割, 截取)

  将PDF拆分为单页或导出自定义页面范围。

• PDF页面管理 (重排, 旋转, 删除)

  在本地重新排序、旋转、删除和清理PDF页面。

• PDF转JPG/PNG (图片提取, 转换, 导出)

  直接在浏览器中将每个PDF页面转换为JPG或PNG图像。

• 图片转PDF (合并, JPG, PNG)

  即时将多张JPG/PNG图片合并为一个PDF。

• PDF解锁 (移除密码, 解密, 去除保护)

  输入正确密码以在浏览器中重建未锁定的PDF副本。

• 图片压缩工具 (PNG, JPG, WebP, 瘦身)

  在不损失质量的情况下压缩JPG、PNG和WebP图像。

• 图片加水印 (批量, 文字, 版权保护)

  批量为图片添加文字水印并导出为JPG/PNG ZIP。

• HEIC转JPG转换器 (iPhone照片, 批量, 格式转换)

  批量将HEIC/HEIF照片转换为JPG或PNG。

• Regex Test 在线正则测试与调试工具 (在线验证)

  无需打开IDE，免费在线进行 Regex Test。即时预览匹配、标志和捕获组。

最新指南

博客保持英文，主要发布与工具配套的实用教程和操作指南。

• How to Merge PDF Files Free Online — No Uploads, No Limits (2026)

  Combining PDF files should be simple, free, and private. Whether you're merging a contract, assembling a thesis, or organizing receipts for an expense report, you shouldn't have to upload your documents to a stranger's server to do it. TL;DR — Use the PDF Merge Tool to merge any number of PDFs in your browser. No upload, no signup, no daily limits, no file size cap imposed by a server. Drag, d…

• Instagram Reel Cover Size 2026: Exact 1080×1920 Dimensions and Safe Zone

  The correct Instagram Reel cover size in 2026 is 1080×1920 px in a 9:16 vertical frame. The part that causes mistakes is the profile grid: Instagram shows a center 1080×1350 px safe zone, so text, faces, and logos near the very top or bottom can be cropped. If your Reel cover looks great in preview but gets awkwardly cropped in your profile grid, this guide gives you the exact dimensions and a…

• Favicon Size Guide 2026: Exact Dimensions for ICO, PNG, SVG, and Apple Touch Icons

  If you only need the answer, use this favicon size set for most modern sites: 16x16 and 32x32 inside favicon.ico, a 32x32 PNG for crisp browser tabs, a 180x180 Apple Touch Icon, a 192x192 PWA icon, and a 512x512 PWA icon. In the early web, a single favicon.ico file was enough. Today that is only the fallback layer. Modern sites usually need a small browsertab icon, a few PNG assets for higherd…

• How to Keep Screen On During Google Meet, Zoom & Teams (2026)

  Working from home? Nothing kills your flow faster than your screen going dark in the middle of a Zoom call, a client demo, or while monitoring your work dashboard. Stop fighting with power settings. Use our Keep Screen On tool to prevent sleep mode with one click—no software installation, no admin privileges required. If your main problem is a lockeddown corporate laptop where IT prevents you…