Combine multiple PDF files into a single document. Drag, drop, reorder, and merge — all in your browser.
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Supports multiple PDF files, no upload to server
CSC Tool Hub's Merge PDF tool combines multiple PDF files into one document, entirely in your browser — nothing is uploaded. The mechanics (drag, reorder, download) take seconds. What actually matters for most people using this — especially for government or job applications — is which order to merge documents in and knowing what this tool can't do (like unlock encrypted PDFs), which is what this page covers.
For a typical government form submission, the expected order is usually:
| Position | Document |
|---|---|
| 1 | Main application form (filled and signed) |
| 2 | Identity proof (Aadhaar, PAN, etc.) |
| 3 | Address proof |
| 4 | Photograph / signature specimen (if separate) |
| 5 | Supporting/supplementary documents (certificates, affidavits) |
This is a general convention, not a universal rule — always follow the exact order listed in the specific form's instructions, since some departments explicitly number the required attachment sequence.
Because merging happens in your browser's memory rather than on a server, very large combined files can slow the tab down or, on lower-memory phones, cause it to crash before finishing. 100MB total is a safe ceiling for most laptops and modern phones; if you're near that limit, compress individual PDFs first or merge in two smaller batches and combine the results afterward.
Each uploaded PDF is read using PDF.js (for the on-screen thumbnail preview) and PDF-Lib (for the actual merge). When you click "Merge & Download," the tool copies every page from each file, in the order you've arranged the cards, into a brand-new PDF document — all inside your browser tab, with no file ever leaving your device.
All merging happens locally using PDF.js and PDF-Lib running in your browser tab. Your PDF files are never uploaded to any server, and everything clears when you close or refresh the page.
CSC Tool Hub builds small, single-purpose browser tools for everyday document work — this PDF merger, a JPG-to-PDF converter, a marriage biodata maker, a resume builder and more, aiming to keep processing on-device wherever the task allows it.
Questions or a feature request? Reach us at support@csctoolhub.com.
The merge engine can't read pages from an encrypted PDF without the password. Remove the password protection from that file first, then re-upload it.
Most departments expect the main application form first, followed by identity proof, address proof, and supporting documents last — but always follow the exact order listed in that specific form's instructions.
Merging happens in your browser's memory rather than on a server, so very large combined files can slow down or crash the tab on lower-memory devices. 100MB is a safe practical ceiling.
Page content and formatting merge exactly, but bookmarks, fillable form fields, and some metadata from the originals are not carried into the merged file.
No — remove the password before merging, since the tool can't read encrypted pages.
Yes, drag and drop file cards to reorder them; the merge follows the sequence you arrange.
Yes, it's fully responsive and works on smartphones, tablets, and desktops.
Yes — files are processed locally in your browser and never uploaded to any server.
Yes, any number of files can be merged in a single operation.
© 2026 CSC Tool Hub — Free Merge PDF Tool
All processing is browser-based. No files are uploaded to servers.