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EasyToolsBox 的实用教程与指南，覆盖图片压缩与转换、PDF 工具、JSON 格式化、文本对比、二维码和文件哈希等常用功能。所有操作都在浏览器本地完成，你的文件不会上传到任何服务器。
Crop images online to any aspect ratio with a free browser tool. Learn the preset ratios for social media, how drag-and-zoom framing works, and why client-side cropping keeps your photos private.
Compress images online free in your browser. Learn how the quality slider trades file size for sharpness, how compression differs from resizing, and why your photo never leaves your device.
Add a border or frame to an image online free. Twelve templates from polaroid to neon, plus a custom border with width, color, and corner radius. All in your browser.
Write and preview Markdown online free. Learn the core syntax, how live preview works, and how a browser-based editor keeps your drafts private while exporting clean .md files.
Convert Word documents (.docx) to PDF online free. How the browser print path works, what formatting survives, and why a client-side converter keeps your file off any server.
Convert units online across length, weight, temperature, area, volume, speed, time, and data. Which conversion traps cause wrong answers, and why a browser-based converter keeps your numbers private.
Convert HTML to Markdown online free. How the conversion works, what it preserves and drops, and why a browser-based converter keeps your code private.
Create QR codes for URLs, WiFi, text, and contacts in your browser. How static codes work, what to customize, and how to check your data stays private.
Generate strong random passwords in your browser. How length and character types affect strength, why crypto randomness matters, and what a safe generator never does with your data.
What is MD5 and how does it work? A developer's explainer on the 128-bit hash, why collision attacks broke it for security, and where it is still useful.
Convert images between JPG, PNG, WebP, GIF, BMP, and ICO in your browser. Which format fits which job, what conversion does to quality, and how to keep your files private.
A developer's guide to JSON formatters: what they do, why formatted JSON catches bugs faster, how beautify and minify differ, and what happens to your data when you paste it into an online tool.
Learn how to scan QR codes from images or your camera using a free online QR code reader. Works in your browser with no app download required. Supports URLs, WiFi passwords, text and vCard.
Learn how to use an online diff checker to compare text, code, or JSON files side by side. Works entirely in your browser, no upload required, and supports both unified and side-by-side views.
Resize images without losing quality using a free browser tool. Learn the right pixel sizes, formats, and quality settings, plus why client-side resizing keeps your files private.