Or click to select files, multiple selection supported
This online PDF merger is easy to use. Follow these steps:
Step 1: Upload PDF Files Click the drop zone in the center of the page or drag PDF files directly onto it. You can select multiple files at once. Files can be added in batches.
Step 2: Adjust File Order After uploading, files appear in a list. Use the Up/Down buttons to reorder them. The merge will follow the list order. Make sure the order is correct before merging.
Step 3: Merge & Download Once the order is set, click the "Merge PDFs" button. The tool processes everything in your browser. A progress bar shows the status. After completion, click "Download Merged PDF" to save the file.
Notes: All processing is done locally in your browser β no data is uploaded. For best results, use Chrome, Edge, or another modern browser. Total file size should ideally not exceed 500MB per merge.
PDF merging is widely used in work and academic scenarios. Here are some typical examples:
Contracts and Agreements: In business, you often need to merge supplementary agreements and attachments with the main contract into a single PDF. This tool helps you quickly consolidate scattered PDFs into an organized document.
Academic Paper Submission: When submitting to journals or conferences, the main paper, references, and figure appendices often need to be combined into one PDF. This tool helps researchers merge all components quickly.
E-book Chapter Assembly: When a reader or printing service requires a single large file, you can merge multiple chapter PDFs into a complete e-book. This is especially useful for self-publishing and print-on-demand.
Report Archiving: Monthly and quarterly business reports are often spread across multiple files. Merging them creates a continuous document record for easier review and management.
PDF File Structure: PDF (Portable Document Format) is an open standard file format developed by Adobe. Each PDF document consists of a file header, body objects (including pages, fonts, images, and other resources), a cross-reference table, and a file trailer. PDF merging essentially reads the page objects from multiple PDFs and writes them sequentially into a new document.
Client-Side PDF Processing: This tool uses the pdf-lib library to process PDFs directly in the browser. pdf-lib is a pure JavaScript PDF manipulation library that supports creating, modifying, and merging PDF documents without backend dependencies. All operations are performed client-side, ensuring maximum data security.
Limitations of PDF Merging: The client-side approach is limited by browser memory, so extremely large files may not process correctly. Encrypted PDFs, digitally signed PDFs, and interactive form PDFs may lose some features after merging. For advanced PDF processing, consider dedicated PDF editing software.
No. This tool runs entirely in your browser. All PDF files are processed locally on your device and never uploaded to any server. Neither the original files nor the merged output leave your computer.
The total combined size should ideally not exceed 500MB per merge. Since processing is done entirely in the browser, the limit depends on your browser's memory and performance. For very large files, consider merging in smaller batches.
Yes. After uploading files, you can reorder them using the Up/Down buttons next to each file. The tool merges files in the order they appear in the list. Make sure the order is correct before merging.
Yes. The tool uses the pdf-lib library to merge PDFs, which preserves all original content including text, fonts, images, and layout. The merge process simply appends pages in sequence without altering the original format.
No. Password-protected PDFs must be decrypted first before merging. Please use a PDF decryption tool to remove the password, then merge the files with this tool.
Chrome, Firefox, Edge, Safari, and other modern browsers are supported. For the best experience, please use the latest version of your browser.