Every PDF tool on LocalPDF runs entirely in your browser using WebAssembly. Your files stay on your device — open, edit, merge, OCR, compress, sign, convert, and download without a single byte ever leaving your computer. Works offline after the first load.
When you open a PDF in LocalPDF, the file is loaded into your browser's memory. Every tool — edit, merge, OCR, compress, split, sign, convert — runs as WebAssembly code on your device. There is no server involved. Your file is never uploaded, never stored, and never transmitted anywhere. After the initial page load, all processing continues to work without an internet connection.
For contracts, invoices, scanned IDs, legal documents, and internal records, uploading a file to a third-party server creates risk. Local processing eliminates that risk entirely — the file never leaves your control. No privacy policy to trust, no data retention to worry about, no breach exposure.
Edit PDF text and images. Merge multiple documents with drag-and-drop. Run OCR on scanned files. Compress before emailing. Split pages out of large documents. Sign and convert between formats. All of it locally, all in one workspace.
Correct. LocalPDF loads the file into browser memory. All tools are compiled to WebAssembly and execute locally. There is no server-side processing, no upload queue, and no file storage. You can verify this by disconnecting your internet after the page loads — everything keeps working.
For most PDF tasks, local processing is faster — there is no upload delay, no queue, no download wait. Editing and merging are near-instant. OCR and heavy compression take 1-2 seconds per page, comparable to server-side but without the privacy trade-off.
All of them. Edit, merge, OCR, compress, split, sign, and convert all work without an internet connection after the initial page load. PDF processing runs entirely on your device.
