Merge PDF
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Need help?How to Merge PDF Files Online
- Upload Your PDFs: Click "+ Add Files" or drag PDFs onto the page. Add files from your computer, Google Drive, or Dropbox. There is no built-in cap on the number of files — upload everything you want in one batch.
- Arrange Order: Drag and drop the file tiles to set the sequence. Files concatenate top-to-bottom in the order shown — the first file's pages appear first in the merged PDF, the last file's pages last.
- Pick Compression Type (Optional): Under Advanced Options, choose a Ghostscript preset — Screen (Best, smallest size,
72 dpi images) for email, Ebook (150 dpi) for reading, Default for general use, Prepress (300 dpi, color-preserving) for print, or Printer (300 dpi) for office printing. Skip this if you want the smallest possible output. - Merge and Download: Click "Merge". Each source file's pages are appended in order and the combined PDF downloads to your device. No watermark, no sign-up, no page limits.
Why Merge PDF Files?
PDF is a container format defined by ISO 32000-2 — every page carries its own size, fonts, and content stream, so combining files is a clean concatenation rather than a re-layout. That makes merging the safest way to consolidate documents without altering them.
- Job and university applications — Portals like Common App, USAJOBS, and most graduate-school systems accept exactly one PDF per upload slot. Merge your resume, cover letter, transcripts, recommendation letters, and certificates into a single ordered file in the sequence the rubric requests.
- Visa and immigration packets — USCIS and most consulates require supporting documents (passport scan, financial proofs, photos, I-20 / DS-160 receipt) bundled into one PDF per evidence category. Merging beats stapling scanned pages individually.
- Multi-page contract assembly — Combine the main contract, exhibits, NDAs, and signed signature pages into the executed master copy before archiving in DocuSign, Adobe Sign, or your CMS.
- Invoice and expense reports — Bundle the cover memo, line-item PDF, and receipt scans into one file per submission so your AP team or expense tool sees a single audit trail.
- Scanned book chapters — If you scanned a textbook chapter-by-chapter or page-by-page (many flatbed scanners produce one PDF per scan), merge the parts in order to get a readable single document with proper page navigation.
- Legal e-filing — Federal PACER, state e-courts, and many tribunals demand a single PDF per filing with bookmarks for each exhibit. Merge first; bookmark or split later as needed.
Merge vs Alternatives — Picking the Right Tool
| Goal | Use | Notes |
|---|---|---|
| Combine existing PDFs in order | Merge PDF (this page) | Page-by-page concatenation; original formatting preserved |
| Convert images + combine into one PDF | Merge Image to PDF | Wraps JPG/PNG/HEIC pages into a new PDF, then concatenates |
| Output one PDF per image | Convert JPG to PDF | Per-file output, no combining |
| Shrink the merged file | Compress PDF | Run after merge if size matters for email/upload |
| Pull pages from one PDF | Split PDF | The inverse operation — extract a page range |
What Carries Over From Each Source File
| Element | Preserved? | Notes |
|---|---|---|
| Page content, fonts, images | Yes | Pages are copied byte-level; no re-render |
| Page size and orientation | Yes | Letter, A4, Legal, custom sizes all coexist in the output |
| Internal hyperlinks (same document) | Yes | Links inside a source file still jump to the right page |
| External hyperlinks (URLs) | Yes | Clickable URLs remain intact |
| Form fields (AcroForm) | Mostly | Fields carry over; duplicate field names across source files may collide |
| Bookmarks / outlines | Generally yes | Existing outlines are kept; nesting under per-file headings is not auto-generated |
| Document metadata (Title, Author) | First file wins | Output inherits the first file's metadata; edit afterward if needed |
| Digital signatures | Invalidated | Any signed PDF's signature breaks once its pages are combined with others (PDF spec requirement) |
Compression Preset Quick Guide
| Preset | Image DPI | Typical Use | Output Size |
|---|---|---|---|
| Screen (Best) | ~72 | Email, web upload | Smallest |
| Ebook | ~150 | Tablets, e-readers | Small |
| Default | mixed | General use | Medium |
| Prepress | 300 (color preserved) | Commercial print | Large |
| Printer | 300 | Office laser/inkjet | Large |
Frequently Asked Questions
How many PDFs can I merge at once?
XConvert does not impose a hard file-count limit — the practical ceiling is your browser memory and upload bandwidth. For comparison, Adobe's free online merger caps a single job at 100 files and 1,500 total pages, with each file up to 500 pages. Most users merging document packets stay well under those numbers.
Will my bookmarks and outlines survive the merge?
Existing bookmarks inside each source PDF are preserved in the output. What is not automatic is a new top-level bookmark for each source file — tools like Adobe Acrobat Pro add those during their Combine Files workflow, but most online mergers (including this one) keep the original outline tree and append the next file's outline below it.
Are AcroForm fields kept after merging?
Yes, form fields are carried into the merged PDF and remain fillable. The one gotcha: if two source files share the same field name (common with templated forms), the values may link together. Rename fields in the source PDFs first if you need them independent.
What happens to a digitally signed PDF when I merge it?
Per the PDF specification, any digital signature is invalidated the moment the document changes — merging counts as a change because it adds pages. If you need a signed packet, sign the merged PDF after combining, not before. The visible signature appearance stays, but verification will report "signed PDF was modified."
Can I merge password-protected PDFs?
You need the open password (the one that lets you view the file) to merge a protected PDF — XConvert prompts for it when you upload. Owner-password-only files that allow viewing without a password merge without intervention. PDFs with copy/print restrictions only are usually mergeable.
Why do I get different page sizes in the output?
Each source page keeps its native size — Letter pages stay Letter, A4 stay A4, scans at custom sizes stay at custom sizes. This is intentional and matches the PDF 2.0 model (one MediaBox per page). If you need uniform sizing, convert images through Merge Image to PDF with a fixed paper-size preset instead.
Should I compress before or after merging?
Compress after merging when possible — running a single Compress PDF pass over the combined file is more efficient than compressing each source individually. The Advanced Options compression presets on this page apply during merge, so you can do both in one step if you pick Screen or Ebook.
Why is my merged PDF bigger than the sum of the originals?
PDFs often share resources (fonts, images) within a single file via cross-reference tables. When two files are concatenated, duplicate fonts and images may end up embedded twice instead of being deduplicated. The output is usually 5–15% larger than the sum of inputs; running it through Compress PDF recovers most of that overhead.
Is my data private?
Yes. Files upload over HTTPS, are processed on isolated worker nodes, and are auto-deleted after a short retention window. No account is required and we do not retain or share document contents.