Merging PDFs is one of the most common document chores: stitching a cover letter to a résumé, combining scanned receipts, or assembling chapters into one report. ToolOrbit’s Merge PDF tool does it entirely in your browser using the pdf-lib library, so your files never get uploaded to a server.
How merging works
The tool reads each PDF you add, copies every page into a fresh document in the order you choose, and saves the result. Because pages are copied rather than re-rendered, text stays selectable and quality is untouched.
How to merge PDFs
- Drop in or select two or more PDF files.
- Use the up and down controls to arrange the order.
- Click Merge to build the combined document.
- The merged PDF downloads automatically.
Why do it in the browser
Most online PDF mergers upload your documents to their servers. For contracts, invoices, or anything confidential, that is a real privacy risk. ToolOrbit keeps everything local, so the only place your PDFs exist is your own device.
Practical merge use cases
- Job applications: cover letter + résumé + portfolio index as one clean file.
- Expense reports: receipts and invoices combined into a single submittal.
- Scanned chapters: assembling a document that started as separate scans.
- Contract packages: agreement, schedules and signatures stitched together for one email.
Mixed page sizes and orientations
A merged PDF keeps each source page exactly as it was, so a Letter page from one file and an A4 page from another coexist fine. That is intentional: re-sizing pages would degrade them. What you do want to check is that rotated pages are upright in the source file before merging, since the merge copies orientation as-is.
After merging, clean the metadata
Every source file can bring hidden author and software metadata into the merged document. Before sending it outside your organisation, strip document metadata so the file does not advertise the editor or the person who created it — a one-click step that makes the merged result look professionally produced.
Ordering, naming and big-file tips
Merge order is page order: drag to rearrange before the final step, and paste files in the sequence your reader expects — a cover letter glued after the résumé reads oddly. Files arrive as separate objects, so check the page count afterwards rather than assuming (scans often contain a blank sheet at the end). For very large documents, merging stays lightweight precisely because no re-rendering happens — every page is copied byte-for-byte.
- Verify the final page count equals the sum of your sources.
- Rotate before merging; correction after the fact needs a per-page trip.
- Name the merged file meaningfully — the source names are not preserved.
