Confidential Document Conversion
A high-speed, local WebAssembly conversion engine designed for developers, legal teams, and privacy-conscious users. PDF, Word, Markdown, and CSV processed securely on your device.
Drop documents here, or browse
100% In-Browser · No Registration · Instant Local RAM Processing
Explore Supported Format Pipelines
WebP to PNG
PNG to WebP
JPG / JPEG to PNG
PNG to JPG
WebP to JPG
JPG / JPEG to WebP
图片 (PNG/JPG) to PDF
PDF to Markdown
Markdown to PDF
PDF to TXT (纯文本)
PDF to PNG 图片
Word (DOCX) to Markdown
Word (DOCX) to HTML
Word (DOCX) to TXT (纯文本)
Markdown to HTML
CSV 表格 to Markdown 表格
CSV 表格 to JSON 数据
JSON 数据 to CSV 表格
JSON to YAML
YAML to JSON
HTML to Markdown
SVG 矢量图 to PNG
Why Professionals Reject Cloud File Uploads
Uploading confidential financial reports, contracts, or source code to remote servers creates irreversible breach and AI scraping risks.
Zero Network Telemetry · Ephemeral Memory Sandbox
Every conversion algorithm executes inside your device memory via Mozilla PDF.js, Mammoth, and WebAssembly. Disconnect your internet connection at any time—conversion will continue to operate with 100% fidelity.
Native CPU Acceleration
Skip network delays and remote server queues. Harness your multi-core processor for multi-threaded parallel document processing.
Offline Airplane & Air-Gapped Compatibility
Equipped with Service Worker caching. Convert files securely on flights, high-speed rail, or secure air-gapped corporate environments.
Frequently Asked Questions (FAQ)
Frequently Asked Questions & Technical Specifications
Q1.Why is LocalDoc 100% private and secure?
Unlike traditional online converters that upload files to cloud servers, LocalDoc runs entirely inside your browser using WebAssembly (Wasm). All document transformations happen in local RAM without sending a single byte across the internet.
Q2.Is there any file size limit?
No artificial server quotas. Because processing relies on your local CPU and available memory, large files and high-resolution images convert instantly without queueing.
Q3.Where are converted files stored?
Downloaded files are saved directly into your device download folder via browser memory blobs. Once you close or reload the tab, memory is cleared with zero persistent traces.
Q4.Does it work offline?
Yes! LocalDoc is equipped with a Progressive Web App (PWA) Service Worker. Once loaded, you can convert documents on airplanes, trains, or air-gapped corporate environments without an active internet connection.