Edit PDFs privately
Merge, split, sign, redact and more — right in your browser. Your PDF files are processed locally and are never uploaded by this app.
Drop PDF or image files here
or
PDFs and images (JPG/PNG). Everything happens on this device.Every PDF tool you need — free and 100% private
LambiPdf is a free online PDF editor that runs entirely in your web browser. Unlike most online PDF tools, your files are never uploaded to a server — every action happens locally on your device, so your documents stay completely private. No sign-up, no installation, no watermarks.
Merge PDF
Combine multiple PDFs (and images) into one file, and reorder or rotate pages first.
Split PDF
Split a PDF into separate files by page, by ranges, or every N pages.
Extract pages
Pick the pages you need and save them as a new PDF.
Sign PDF
Drop your signature or logo image onto any page.
Redact PDF
Black out sensitive text — redacted pages are flattened so content is truly removed.
Encrypt & decrypt
Password-protect a PDF with AES, or remove a password you know.
Watermark & page numbers
Add diagonal watermarks and Bates-style page numbers.
Convert
Turn images into PDFs, export pages to images, or extract text to a file.
How to edit a PDF with LambiPdf
- Add your files. Drag and drop PDFs or images, or click “Choose files.” They load instantly, right in your browser.
- Pick a tool. Merge and organize by default, or choose Split, Watermark, Sign, Redact, Encrypt and more from “More tools.”
- Download. Your edited PDF is generated on your device and saved to your Downloads folder. Nothing is uploaded.
Why choose LambiPdf?
Most free PDF websites upload your documents to their servers to process them. LambiPdf does the opposite: it uses your browser to merge, split, sign, and edit PDFs, so sensitive contracts, IDs, and records never leave your computer. It's faster, works offline once loaded, and keeps you in control of your data.
Frequently asked questions
Is LambiPdf really free?
Yes. All tools are free to use with no sign-up and no watermarks. Optional tips via “Buy me a coffee” help keep it running.
Are my files uploaded to a server?
No. Every PDF is processed inside your browser using your device's memory. Your files are never uploaded to us or anyone else.
Do I need to install anything or create an account?
No installation and no account. Just open the site and start editing PDFs.
What can I do with LambiPdf?
Merge, split, extract, rotate and reorder pages, add page numbers and watermarks, sign, redact, fill forms, encrypt/decrypt, convert images to PDF, export pages to images, and extract text.
Does it work on mobile?
Yes — LambiPdf works in any modern browser on desktop, tablet, and phone.
Is it safe for confidential documents?
Yes. Because files are processed locally and redaction flattens pages to images, LambiPdf is well suited to private and confidential PDFs.