Docly is a free, browser-native tool for converting and editing documents — built under the RuntimeHub / RuntimeZero umbrella of privacy-first web utilities.
Docly is a static web application that runs entirely in your browser. It converts documents between formats — DOCX, PDF, ODT, RTF, HTML, Markdown, TXT, EPUB and more — and provides an in-place editor for lightweight document edits, all without uploading files to any server.
Every byte of processing happens locally using browser APIs: the File API for reading, Web Workers for background processing, and the browser Download API for output. The tool works offline after a single initial load.
Most document conversion tools on the web operate by uploading your file to a server, processing it remotely, and returning a result. This creates an unavoidable window during which your document is outside your control. For contracts, research, personal correspondence, or any file with confidential content, this is an unnecessary risk.
Docly takes the opposite approach. The conversion logic lives in the browser. The server role is limited to delivering the HTML, CSS, and JavaScript — the same role any static website plays. After that, your files never leave your machine.
Docly is part of the RuntimeHub suite — a growing collection of free, privacy-first browser tools built under the RuntimeZero brand. The suite includes tools for image compression, audio conversion, text-to-speech, background removal, AI upscaling, and more.
All RuntimeHub tools share the same principles: no accounts, no uploads, no subscription tiers, computation runs client-side, and the tools are deployed as static pages on Cloudflare's global edge network.
Docly is written in plain HTML, CSS, and JavaScript — no frameworks, no build steps. Format conversion runs in a dedicated Web Worker thread. Encoding detection and in-place editing operations run in a second Worker. The main thread handles only UI rendering.
The page is deployed as a static multi-page application on Cloudflare Pages, served with appropriate security headers for cross-origin isolation where required.
Docly is free to use with no usage limits and no paid tier. The tool is supported by unobtrusive display advertising shown on the page. No data from your documents, filenames, or usage patterns is collected or used for advertising purposes.
For feedback, bug reports, or questions, find RuntimeHub on Instagram at @run.time.0 or TikTok at @runtimezerohub.