PDF Merge

Unlike traditional PDF merge tools that upload your files to a server, Rapidix processes everything directly in your browser using the pdf-lib JavaScript library. Here's the technical process: 1. File Reading: Each uploaded PDF is read into browser memory as an ArrayBuffer using the File API's arrayBuffer() method. The bytes are immediately copied to a Uint8Array to prevent detached buffer issues. 2. PDF Parsing: Each file is loaded using PDFDocument.load() with the ignoreEncryption option, which parses the PDF structure including page trees, content streams, and cross-reference tables. 3. Page Copying: For each source PDF, all pages are copied into a new PDFDocument instance using copyPages(). This preserves fonts, images, annotations, and formatting. 4. Merging: Copied pages are added sequentially to the merged document using addPage(). 5. Output: The merged document is serialized to bytes using save(), then converted to a downloadable Blob with the application/pdf MIME type. The entire process happens in browser memory with zero network requests, ensuring complete privacy for sensitive documents.

1. Click or drag PDF files into the upload area. 2. Reorder files using the up/down arrow buttons. 3. Remove unwanted files with the X button. 4. Enter a filename for the merged output. 5. Click "Merge & Download" to process. 6. The progress bar shows the merging status. 7. The merged PDF downloads automatically when complete. Tips: For best results, ensure all PDFs are not password-protected. Files up to 50MB each are supported, though very large files may take longer to process.

Traditional online PDF tools require you to upload files to remote servers. This creates several risks: Data Exposure: Your files exist on someone else's server, potentially accessible to employees or hackers. Data Retention: Some services retain uploaded files for minutes, hours, or even indefinitely. Transmission Risk: Files can be intercepted during upload/download over the network. Rapidix eliminates all these risks because your PDFs never leave your device. The pdf-lib library runs entirely in your browser's JavaScript sandbox. This makes it safe for confidential documents, financial statements, medical records, legal contracts, and proprietary business materials.