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Summarize long text or PDF files with AI using your own API key: pick the summary length and output language. Nothing is uploaded to any server.
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Translate text with AI using your own API key: choose the target language, preserve formatting, keep your glossary and compare a bilingual view. Supports Vietnamese, English, Japanese, Korean, Chinese, Thai and more.
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Color Blindness Simulator
Simulate how color blind people see images and colors. Test for protanopia, deuteranopia, tritanopia, and achromatopsia. Free online color blindness simulator tool with real-time SVG filters.
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Image Compressor
Compress JPEG and PNG images online free. Reduce image file size without losing quality. All processing in your browser, no upload to server.
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FAQ
Code is sent from your browser only to the AI provider you choose, using your key. BoxTool never receives or stores it. Avoid pasting code containing secrets or code you are not allowed to share.
Paste one function or one file at a time, ideally under ~300 lines, for accurate answers and lower token cost.
About this tool
This tool helps when reading someone else's code, encountering unfamiliar snippets, or sanity-checking for bugs before a review. The AI summarizes the purpose, walks through each step, points out issues (nulls, off-by-one, performance, security) and suggests a cleaner rewrite. Always verify — models can be wrong.