Merge PDF Files

Our tool allows you to merge an unlimited number of PDF files, provided that the total size of all files combined does not exceed the processing capabilities of your browser. For optimal performance, we recommend keeping the total size under 500MB, although many users successfully merge larger collections. If you're working with particularly large files, consider splitting the merging process into multiple smaller batches.

No, our PDF merger maintains the original quality of your PDF files. The tool performs a lossless combination of the documents, ensuring that text sharpness, image quality, and formatting remain intact. With our new quality optimization options, you can choose between different modes: "High Quality" preserves maximum detail, "Balanced" provides optimal quality-to-size ratio, and "Smaller Size" reduces file size while maintaining good visual quality.

Our PDF merger includes comprehensive beautification features: standardize page sizes (A4, Letter, Legal, etc.), set uniform orientations, add consistent margins, include page numbering in various positions, insert separator pages between files, apply background colors, and use intelligent scaling to ensure all pages look professional and consistent. These options help create polished, presentation-ready documents.

Absolutely. Privacy and security are our top priorities. Our PDF merger processes your files directly in your browser using JavaScript, which means your PDFs never leave your device or get uploaded to any server. The entire merging process happens locally on your computer, ensuring complete confidentiality of your documents. After the merged file is created and downloaded, no copies are retained anywhere.

Currently, our tool cannot process password-protected or encrypted PDF files directly. To merge such documents, you'll need to remove the password protection first using our "Unlock PDF" tool or another method. Once the files are unlocked, you can then use the PDF Merger without any issues. Please note that you should only remove password protection from files that you have the legal right to access.

Our scaling options help standardize your merged PDF: "Fit to Page" scales content to fill the available space, "Shrink Only" reduces oversized content while leaving smaller content unchanged, and "Uniform Size" ensures all pages have consistent dimensions. Margin options add professional spacing around content, with presets (Small, Medium, Large) or custom measurements. These features are perfect for creating professional documents from varied source materials.