About InBrowserPDF
Learn how InBrowserPDF uses Web Workers and WebAssembly to process PDFs locally, and how its tool limits are documented.
Last updated: 4 November 2026
- 38+ specialized PDF tools engineered to run 100% locally inside your web browser.
- Powered by SvelteKit, PDF.js, and Rust, LibreOffice, Tesseract, and ONNX WebAssembly.
- Honest documentation of technical boundaries, file size limits, and output verification.
A PDF workspace on your device
InBrowserPDF.app provides tools to organize, optimize, convert, edit and protect PDF documents without uploading those documents to a processing service. The interface is built with SvelteKit; CPU-intensive work runs in dedicated browser workers.
JavaScript libraries handle orchestration and many page operations. Rust, LibreOffice, Tesseract and ONNX WebAssembly engines support heavier tasks. Large engines load on demand instead of being downloaded for every initial visit.
What local processing means
Your device supplies the processing power and memory. Your browser still downloads the website and public processing engines. Hosting infrastructure sees ordinary asset requests, while the application keeps selected files, passwords and extracted contents within the local workspace.
There are no accounts or cloud document backups in the current app. Closing the workspace stops local jobs. You choose when and where to download results.
How we describe and check tools
Tool guides describe current formats, workflows and known limits. Automated checks inspect actual exported files and exercise production-browser workflows, error handling and cancellation. A representative PDF/A-2b export was also checked with veraPDF.
These checks help identify regressions; they do not establish universal compatibility or certification. Tool behavior and content should be reviewed together when an engine or feature changes.
Contact and feedback
Send feedback or a reproducible issue to support@inbrowserpdf.app. Include the tool name and browser version, and avoid sending private files. The privacy policy explains browser storage and support messages.