The Best Free PDF Tools That Run Entirely in Your Browser
Search "merge PDF" and you'll drown in upload sites: pick a file, wait for it to crawl to someone's server, solve a captcha, dodge three upsell banners, download the result. In 2026 none of that is necessary — browsers can do all of it locally, thanks to WebAssembly and libraries like pdf-lib and Mozilla's pdf.js.
What you can do without uploading
- ✦Merge multiple PDFs into one, with drag-to-reorder.
- ✦Delete, reorder, and rotate pages — or insert new pages from PNG/JPG images.
- ✦Sign documents by drawing, typing, or uploading a signature, then dragging it into place.
- ✦Convert PDF pages to crisp PNG/JPG images, or bundle images into a PDF.
Why local-first matters for documents
Contracts, IDs, medical records, financials — PDFs are usually the most sensitive files people handle. When editing happens in browser memory, there's no server copy, no retention policy to trust, and no breach surface. It's also faster: no upload/download round trip, no queue.
Every PDF tool on Starlight Tools works this way — free, no account, no file-size games. Pin your favorites to the top of the page and they'll be waiting next time.
Tools in this guide
Try the tools ✦
Free browser tools that never upload your files.