// 免费在线工具

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Percentage Calculator

Find percentages, calculate increases and decreases, and express one number as a fraction of another.

Reading Time Calculator

Paste any article text to instantly estimate reading time. Adjust for slow, average, or fast readers.

Calculate tip, split bills between any number of people, and round up totals. Multiple currencies supported.

Invoice Generator

Create a clean PDF invoice in seconds - no account, no watermark, no subscription.

Image Compressor

Compress JPG, PNG, WebP and AVIF images in your browser. Convert formats, resize, and reduce file size by up to 90%.

Edit PDFs in your browser - add text, draw, highlight, rotate or delete pages, and download instantly. No upload required.

Password Generator

Generate strong, random passwords instantly. Customize length and character sets - runs entirely in your browser, never uploaded.

QR Code Generator

Generate QR codes from any URL or text instantly. Customize size, colors, and error correction. Download as PNG or SVG.

Email Signature Generator

Create professional email signatures with your logo, social links, and custom colors. Copy HTML or paste directly into Gmail/Outlook.

Spam Words Checker

Paste your email content and get a spam score with flagged trigger words highlighted. Improve deliverability before you hit send.