🖼️ Image Tools
Images are everywhere — profile pictures, marketing banners, app icons, QR codes on packaging. The problem is that most online image tools require you to upload your files to someone else's server. That means your photos, your brand assets, and sometimes your private screenshots pass through infrastructure you don't control.
Every tool on this page works differently. All processing happens inside your browser. Your images are never uploaded to any server — they stay on your device from start to finish. Whether you're converting a PNG to WebP, stamping a watermark on a batch of photos, or generating a favicon for your site, the pixels never leave your machine. No account required, no file-size upload limits imposed by a backend, and no wondering who else might access your files.
The trade-off is that very large files depend on your device's processing power and available memory. For most everyday image tasks — web assets, social media graphics, icons, QR codes — browser-based processing is more than fast enough, and the privacy benefit is worth it.
Tools in this category
圖片浮水印
給圖片添加自定義浮水印。
圖片格式轉換器
免費線上將圖片轉換為 JPG, PNG, WebP 格式。
QR 碼生成器
將文本或 URL 轉換為 QR 碼。
Favicon 生成器
將圖片轉換為 Favicon 圖標。
YouTube 縮圖下載
提取並下載高質量 (4K, HD) YouTube 視頻縮圖。
圖片編輯器
裁剪、旋轉圖片並應用濾鏡。
Frequently asked questions
Are my images really not uploaded anywhere?
Correct. All processing uses the Canvas API and JavaScript running in your browser. You can verify this by opening your browser's Network tab — no image data is sent to any server. Your files stay entirely on your device.
Which image format should I choose for the web?
WebP offers the best balance of quality and file size for most use cases. Use PNG when you need lossless transparency (e.g., logos), JPEG for photographs where small file size matters, and SVG for icons and illustrations that need to scale. AVIF is newer and even smaller than WebP, but browser support is still catching up.
Does converting between formats reduce image quality?
Converting from a lossy format (JPEG) to another lossy format compounds quality loss — each re-encoding discards data. Going from lossless (PNG) to lossy (JPEG/WebP) loses some detail once. Converting between lossless formats (PNG ↔ BMP) preserves quality perfectly. The quality slider in the converter lets you control the trade-off.
Is there a file-size limit?
There's no upload limit since nothing is uploaded. The practical limit depends on your device's RAM and browser. Most modern devices handle images up to 20–50 MB without issues. Very large images (100 MB+) may cause the browser tab to slow down or run out of memory.