I Built 21 Free PDF Tools That Never Upload Your Files - on a $0 Stack

说明与用途

作者构建了21个完全在浏览器中运行、从不上传文件的免费PDF工具，使用$0托管堆栈，解决了隐私问题。

问题

Free PDF tools typically require uploading files to a server, raising privacy concerns and uncertainty about data retention.

结果

The project demonstrates that privacy‑first PDF tools can be built entirely client‑side with zero hosting cost, challenging the industry norm of server uploads.

工作流

• 1. User selects a PDF via the File API.
• 2. The file is read as an ArrayBuffer.
• 3. Web Workers process the PDF with pdf-lib or pdf.js for manipulation.
• 4. For OCR, Tesseract.js runs in a Web Worker to extract text.
• 5. Results are displayed and downloadable without any server interaction.

证据

upload your file, wait, download it back, hope nobody kept a copy.

来源

every tool runs client‑side in the browser.

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Next.js on Vercel's free tier

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Supabase free tier (auth + a tiny bit of backend)

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pdf-lib and pdf.js for in-browser PDF manipulation

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Tesseract.js for client-side OCR

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The business model is "no business model" (for a year)

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I underestimated how much people care about this.

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