Interleave PDF (Duplex Fix) — free, private, in your browser
Merge a front-side scan with a reversed back-side scan into one ordered PDF. Unlike iLovePDF or Smallpdf, nothing is uploaded: the processing happens on your own device, so the tool works even with the Wi-Fi off.
Interleave PDF (Duplex Fix) now — no sign-up →How it works
- 1Drop the fronts PDF and the backs PDF
- 2Press Interleave — backs are reversed automatically if needed
- 3Download the correctly ordered document
Questions
Are my files uploaded?
No. CommandEditor runs entirely in your browser with WebAssembly — your file never leaves your device. You can verify it: open your browser's network inspector, or switch off Wi-Fi after the page loads; the tool still works.
Who needs this?
Anyone with a single-sided scanner digitizing double-sided documents: scan all fronts, flip the stack, scan all backs, then interleave.
Related tools
CommandEditor is open source and free forever. 114 tools, 60+ voice commands, on-device AI — your files never leave your device.