한국어 · English
Precision · On-device

Merge & Compress Scanned PDFs

Scanned the front and back pages separately on a single-sided scanner? Re-interleave them into the right order, combine several PDFs into one, and shrink heavy scans. Everything runs in your browser — files are never uploaded. Free, no install, no signup.

🔒 Everything runs entirely in your browser. Your PDFs are never sent to any server.
Color mode
⚠ B&W keeps only text for the smallest file, but charts and shading disappear. Auto and grayscale keep shading, but colors (stamps, highlighter) turn gray.
Adjustments
Resolution
Quality 70
Upload files
How to scan
1
Scan fronts in order
Scan every front side from page 1 onward and save as one PDF.
2
Flip the whole stack
Without reordering, flip the entire stack over and scan the back sides.
3
Merge in reverse
Flipping scans the backs in reverse. Turn on Reverse below to restore 1·2·3·4… order.
Back-side scan order
Recombination preview
Example — 3 fronts · 3 backs
📄
Front scan
1 · 3 · 5 · …
PDF of fronts only
📄
Back scan
2 · 4 · 6 · …
PDF of backs only
Merged preview
FrontBack
Run
✅
Cleanup preview · sample pages
This applies your current settings to sample pages only. If color, skew and resolution look right, apply to all.
Result preview
⚠ Skew detection
📂
Add multiple PDF files
Click or drag · select several at once · each add stacks onto the list
Upload one PDF
🗜
PDF to compress
One scanned PDF
Click or drag · settings in the panel above
Run
Preview · sample pages
Sample pages compressed with your current settings. If text and charts look fine, apply to all.
✅
Result preview

01Who it's for

📑
Double-sided scans
Scanned fronts and backs separately on a one-sided scanner? Re-assemble them into 1·2·3·4… order automatically.
📦
Compress scans
When a scanned workbook is too heavy to email or upload, shrink the file size while keeping it readable.
🔗
Merge PDFs
Drag to reorder scattered PDFs into one file. Exclude or rotate individual pages as needed.

02How to use

  1. Pick a toolMerge double-sided · Merge in order · Compress.
  2. Add your PDFClick the upload area or drag a file in.
  3. (Optional) Turn on cleanupFix skew, color and size. Auto mode keeps color and shading while shrinking.
  4. Run and downloadCheck the sample-page preview, then apply to all pages and download.

03FAQ

How do I merge a double-sided document from a one-sided scanner?
Scan all the front pages into one PDF and all the back pages into another, then upload both — they're re-interleaved into 1·2·3·4… order. If you flipped the back stack, choose the reverse option.
Are my files uploaded to a server?
No. All processing happens inside your browser (on your device); your PDF is never sent to any server. An internet connection is only needed for the first load.
Is it free? Do I need an account?
It's completely free with no install and no signup. Just open the page and use it.
How much smaller will my PDF get?
It depends on the scan and your settings, but scanned PDFs usually drop to about half their size. Adjust the resolution (DPI) and color mode to balance quality and size.
Will compressing hurt quality?
Auto mode keeps color and shading while reducing size. The smallest black-and-white mode keeps only text, so charts and shading may disappear — best for text-only documents.
Free in-browser PDF tools · your files never leave your device
Merge double-sided scans · Compress PDF · Merge PDF