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 合并与压缩、图片转换、二维码、密码生成和单位换算。无需注册或安装，按任务快速找到工具；多数工具在浏览器本地处理输入，各页面说明支持格式及使用限制。

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。

• 金额转大写/单词 (支票, 发票, 财务)

  将美元数字金额转换为英文单词或支票书写格式。

• 网址二维码生成器（PNG）

  将网址生成静态二维码，并下载为 PNG 图片。

• 屏幕常亮 (防止睡眠, 唤醒锁)

  防止您的电脑、手机或 Google Meet 自动休眠。

• 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。

• 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。

• 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。

• 图片调整大小与转换 (缩放, WebP, JPEG, PNG)

  完全在浏览器中将图像调整为精确尺寸并转换为WebP、JPEG或PNG。

• 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。

最新指南

博客发布与工具配套的实用教程——每种语言均为原生撰写，不做机翻复制。

• How to Write a Check Amount in Words: Handwriting Steps and Examples

  For $1,500.75, write One Thousand Five Hundred and 75/100 Dollars on a US check's amount line. Write 1,500.75 in the numeric box. The two fields should represent exactly the same amount. Generate your own written amount, or follow the handwriting steps below. This guide focuses on the amount line; the six-field walkthrough covers the rest of the check. Write the Amount Line in Four Steps 1. Sp…

• Convert Transparent PNG to JPG With a White Background

  To convert a transparent PNG to JPG with a white background, open the Image Resizer, upload the PNG, choose JPEG, then select Resize & convert and Download result. The converter places white behind transparent pixels before creating the JPG. Keep PNG or WebP if the finished image must remain transparent. Why a Transparent Background Can Turn Black PNG can store transparency: a pixel may be com…

• 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. Quick answer: open Keep Screen On in a browser tab and press start before yo…

• 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 browser-tab icon, a few PNG assets for higher…