Merge PDFs & Images with MergeCraft
Why merge PDFs in the browser?
Combining multiple PDFs into a single document is one of the most common office tasks. Whether you are assembling a contract package, collating research papers, or preparing a portfolio, a reliable merge tool saves hours of manual copying and pasting.
Most online PDF mergers require you to upload files to a remote server. That raises privacy concerns — especially when dealing with financial statements, medical records, or legal agreements. MergeCraft eliminates that risk entirely because every operation happens inside your browser using Web Workers and local memory.
There is nothing to install. Open the merger workspace, drop your files, and export. The entire process takes seconds, works offline, and leaves no trace on any server.
Build a clean queue
Open the Merger workspace and drop in every PDF, scan, or photo you need. MergeCraft accepts PDF, JPG, JPEG, PNG, and WebP files. Each file appears as a card with the detected page count so you can reorder at a glance.
Drag cards into position or use the arrow controls for precise adjustments. When a revised file arrives, use Replace to keep the same slot without rebuilding the queue. You can also click Move to First or Move to Last for quick repositioning.
There is no limit on the number of files you can add. MergeCraft processes everything locally, so performance depends on your device rather than network speed or server queues.
Fine-tune every page
Expand a file to see its individual pages as thumbnail tiles. From here you can rotate any page by 90 degrees, delete pages you do not need, or drag pages into a different order within the document.
The history toolbar keeps unlimited undo and redo steps, which is perfect for collaborative reviews where requirements change mid-session. Need consistent orientation? MergeCraft auto-rotates images using EXIF metadata and instantly refreshes thumbnails so you always know what the final output will look like.
Use keyboard shortcuts for faster editing: press R to rotate, Delete to remove, Ctrl+A to select all, and Ctrl+Z to undo. These shortcuts work across the entire pages board.
Dial in export settings
Open the settings drawer to pick image scaling, JPEG quality, and merge mode. Preserve vectors to keep crisp text and selectable content, or rasterize stubborn PDFs that use legacy or embedded fonts.
Image scaling options include Original, Large (300 DPI for print), Medium (200 DPI for presentations), and Small (150 DPI for quick sharing). Choose the level that balances quality and file size for your use case.
When you enable Remember my session, the queue lives in IndexedDB, letting you close the tab mid-project and resume later without juggling temporary exports. This is especially useful for large projects that span multiple editing sessions.
Export with confidence
The sticky export bar at the bottom estimates final file size, shows the active merge mode, and tracks progress with a percentage indicator. For very large batches, keep the browser tab focused so Web Workers have priority access to CPU resources.
Once the download starts, the merged PDF stays on your device. The filename follows the pattern merged-YYYYMMDD-HHmm.pdf for easy organization. Closing the tab clears all temporary data from memory and IndexedDB unless you opted into session recovery.
Common use cases
Legal professionals merge contracts, exhibits, and signature pages into a single court-ready filing. Students combine lecture notes, reference articles, and assignment pages before submission. Designers assemble mood boards, client proofs, and print-ready layouts.
Accountants consolidate invoices, receipts, and tax forms during filing season. HR teams package offer letters, policy documents, and onboarding checklists. In every case, MergeCraft keeps sensitive information off third-party servers.
Go further
Need companion images from your merged document? Pair this guide with the PDF Extractor tutorial to create PNG or JPEG assets for slides, social posts, or documentation.
For a deeper privacy recap, read Why client-side processing matters and share it with stakeholders who review your document workflow. If you need to reduce the final file size, check out our guide on how to compress PDFs without losing quality.