Combine multiple PDFs into one document. No file size limits, no upload to server — 100% secure & free.
Welcome to ToToPDF's advanced PDF merging tool — designed for professionals, students, and anyone who needs to combine PDF documents without restrictions. Unlike many online tools that limit file size or require uploads to external servers, our merger works entirely in your browser. This means your sensitive documents never leave your computer, guaranteeing privacy and speed.
Our PDF merger supports unlimited file sizes (subject to your device memory) and can combine hundreds of PDFs into a single, organized document. Whether you're merging contracts, research papers, e-books, or scanned images, the tool preserves original formatting, images, and vector graphics. The merging engine uses pdf-lib — a robust library that handles complex PDF structures efficiently.
No arbitrary limits — merge large PDFs up to your browser's memory capacity.
Files never uploaded to any server. Your data stays private and secure.
Add multiple PDFs at once, reorder dynamically, and merge with one click.
Using the tool is straightforward: drag and drop PDF files or click "Add PDF Files". You can rearrange the order by dragging items (modern browsers support drag reorder) or simply remove unwanted files. Click "Merge PDF Files", and within seconds, your merged document will be downloaded automatically. The entire process is fast, free, and requires no registration.
For best performance with extremely large files (e.g., 500MB+), we recommend using a modern browser like Chrome or Edge. Our tool automatically handles memory efficiently. ToToPDF is committed to providing professional-grade PDF utilities without hidden fees or subscriptions.