ThumbGen
ThumbGen is a lightweight, privacy-first thumbnail generator that requires no backend. Supports the rapid generation of high-quality thumbnails from video frames, Lottie/TGS animations, pictures and text, and can export ZIP in batches. It is suitable for content creation, blog mapping, product preview and social media graphic production.
·Video frame screenshots: Support MP4/WebM/OGG, accurate frame capture and multi-frame batch export ·Animated thumbnails: Select any frame from Lottie/TGS to generate static thumbnails, and the vector rendering is clear and sharp · Base64 Placeholder: Generate a 2 - 32px ultra-light Placeholder with HTML/CSS/React/Vue code snippets attached ·Text thumbnails: Canvas size can be customized, built-in social media presets, and support for multiple fonts, shadows, strokes and background images ·Watermarking tools: text and image watermarking, nine-square grid positioning and custom placement, support transparency/rotation/zoom, batch processing ·Privacy and offline: Data is not uploaded and all runs in the local browser;PWA can be used offline after installation ·Batch workflow: Multiple file selection, batch generation and ZIP export to improve content production efficiency ·Zero backend dependence: No server or database required, suitable for fast self-hosting and low-cost launch ·Responsive design: Both desktop and mobile terminals can be used well, with a modern, simple and intuitive interface
