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Everything is processed directly inside your browser. No files are uploaded to our servers.
Select two or more PDF files from your device to merge in sequence.
Select an operation below to customize your document workspace.
Unlike cloud converters that transfer your confidential documents to external servers, all parsing and byte assembly occurs directly in your local browser sandbox.
Uses your browser's local processing capabilities to handle PDF parsing, rendering, and document operations without uploading your files.
Document data is kept only for the current session. When you choose another file or leave the workspace, CalcInfinity releases the document data, thumbnails, and processing resources.
| Preset | Target DPI | JPEG Quality | Expected Size Reduction | Best Used For |
|---|---|---|---|---|
| Smaller | 96 DPI | 60% | Aggressive (~60–80%) | Email attachments, online government form upload limits |
| Balanced (Default) | 144 DPI | 80% | Moderate (~40–60%) | Standard web sharing, reading on mobile and laptop screens |
| Better Quality | 192 DPI | 90% | Conservative (~20–40%) | Documents with high-detail schematics, photos, or printouts |