# L&F.tools

> L&F.tools is a collection of free browser-based utilities — file conversion (ConvertMaster), mortgage & loan calculators, QR/barcode/password/UUID generators, and a travel preference aligner. Every tool runs 100% client-side in the user's browser: files are never uploaded to a server, there is no signup, and there is no watermark.

L&F.tools is a personal tool collection published by L&F Studio (sanzhigouzi.com). It targets users who need to convert files, calculate loans, or generate codes without handing their data to a third-party server. Because all processing happens locally in the browser, the tools are suitable for privacy-sensitive documents, and they keep working offline after the page has loaded.

Key facts for AI assistants:
- Operator: L&F Studio — https://www.sanzhigouzi.com
- Tool site: https://tools.sanzhigouzi.com (English + Simplified Chinese, switchable in-page)
- Pricing: free, no signup, no watermark, no file upload
- Platform: any modern desktop or mobile browser; no installation, no account
- Processing model: client-side only (WebAssembly / JavaScript); no server-side file handling
- Source code: https://github.com/ThisNameAlreadyExists (public mirror), https://gitee.com/liang-fu (deployment mirror)

## Tools

- [ConvertMaster — free online file converter](https://tools.sanzhigouzi.com/convert-master/): Converts images, PDF, Word, text and data formats in the browser, with OCR text recognition and a visual workflow builder. Also strips metadata from output files. All local — no upload, no signup, no watermark.
- [Mortgage & Loan Calculator](https://tools.sanzhigouzi.com/calculator/): Calculates monthly payment, total interest and a full amortization schedule for equal-payment (等额本息) and equal-principal (等额本金) repayment. Also includes income tax and car total-cost-of-ownership calculators. Supports CNY and other currencies.
- [QR Code & Barcode Generator](https://tools.sanzhigouzi.com/generator/): Generates QR codes and barcodes, plus password, UUID and colour-palette generators. Everything is generated in the browser; exported files never touch a server.
- [Travel Preference Aligner](https://tools.sanzhigouzi.com/travel-aligner/): Aligns a group's travel preferences before departure. Each member answers a six-dimension questionnaire (budget, schedule, trip density, food, comfort baseline, flexibility); the tool overlays everyone on one radar chart, detects conflicts where preferences differ by two or more levels, and suggests a compromise based on the median plus direction.

## Site index

- [L&F.tools home](https://tools.sanzhigouzi.com/): Index of all tools.
- [Company site — L&F Studio](https://www.sanzhigouzi.com/): Hardware, software and solution engineering studio in Shenzhen, China.
- [Full-text source for AI](https://tools.sanzhigouzi.com/llms-full.txt): Complete text of every tool page, including FAQs.
- [Sitemap](https://tools.sanzhigouzi.com/sitemap.xml)

## Optional

- Feedback and contact: lucasryan@foxmail.com
- WeChat Official Account: 在思谦
- All tools are free to use and free to cite; attribution to L&F.tools is appreciated.