You've probably been in this situation: a client sends you 6 scanned files and wants them combined into a single contract; your manager only needs pages 3 to 5 of a document; or a 20 MB PDF just won't go through as an email attachment. None of these is really a matter of "knowing how to use the software" — first you need to be clear about what result you want, and only then choose the right method. This guide works through these three needs step by step, so you can get your PDFs handled cleanly.
1. When You Need to Combine Multiple PDFs into One
Merging sounds simple, but in practice there are two common pitfalls: wrong order and too many unwanted pages. Putting the wrong file at the end, or letting blank pages from a scan sneak into the mix, both mean redoing the final document.
- Drag all your files into the merge list and arrange them with ↑↓ — the page order in the result matches the list order.
- Expand the "Select Pages" option for each file and check only the pages you actually need; unchecked pages are excluded from the result.
- After merging, check the total page count and download only once everything looks right.
All of these steps can be done visually in the PDF Merge, Split & Compress tool — no software installation required.
2. When You Only Need a Few Pages
The full document is 50 pages, but you only need 3. Copying and pasting won't get you there. The right approach is to "split by page" or "reorganize selected pages":
- Split by page: click the thumbnails and each selected page becomes its own standalone PDF — perfect for "one page per file" scenarios.
- Reorganize selected pages: the pages you need are assembled into a new PDF in the order you click, and the number in the corner of each thumbnail shows its position in the new file — perfect for picking pages from multiple files to build a slimmed-down version.
3. When the File Is Too Large to Send
The main driver of large PDFs is embedded images. Before compressing, think about one thing: will you need to edit the text in this file later? Here is how the two modes compare:
| Mode | What it does | Size | Text & vector | Best for |
|---|---|---|---|---|
| Standard compression | Re-saves and cleans up metadata | Slightly smaller | Fully preserved | Contracts, documents, files that need to be searchable |
| Image-based compression | Converts each page to JPEG and rebuilds | Significantly smaller | Becomes images | Scanned documents, display-oriented files |
For image-based compression, start at 150 DPI with a quality of 0.6: going lower hurts print sharpness, while going higher leaves little room for savings. Before and after, the tool shows the size comparison and the percentage saved, so you can tell at a glance whether you've hit your target.
4. Why You Can Trust an Online Tool
Contracts, IDs and similar documents are exactly what you never want "uploaded to some server". This site's PDF tool handles everything locally in your browser using pdf-lib and pdf.js — your files never leave your device, no account is required, and there are no usage limits. Just delete the local files when you're done.
Frequently Asked Questions (FAQ)
Will merging PDFs change the original layout?
No. The tool copies the original page objects, so fonts, images and layout stay exactly as they are — pages are simply joined in order into a single file.
What if I only need a few pages from a PDF?
Click the page thumbnails to extract pages one by one, or use the reorganize-by-selection feature to assemble the pages you need into a new PDF in the order you click.
Can the text in a PDF still be searched after image-based compression?
No. Image-based mode converts each page to JPEG and rebuilds the file. The result is much smaller, but the text becomes part of the images and can no longer be searched or copied.
Are my PDF files uploaded to a server?
No. All processing happens locally in your browser, and your files are never uploaded to any server.
References
- pdf-lib — a JavaScript library for creating and modifying PDFs: https://github.com/Hopding/pdf-lib
- PDF.js — Mozilla's PDF parsing and rendering library: https://mozilla.github.io/pdf.js/