Merge PDF Files Online
Combine multiple PDF documents into a single unified master document. Guarantees 100% vector fidelity, embedded fonts, and page rotations with zero disk retention.
Select 2 or More PDFs to Merge
Drag and drop multiple PDF documents or click to browse
How to Merge PDF Documents in 3 Steps
Effortlessly combine multi-page reports, architectural sheets, and contracts.
Upload PDF Documents
Select two or more PDF files from your computer or drag them into the upload box.
Arrange Page Sequence
Use the up and down movement arrows to reorder your documents into your desired reading order.
Execute & Download
Click "Merge Documents Now". Our server-side engine stitches the streams and delivers your merged PDF.
PDF Merge Technical Specifications
Why CADConvert offers superior fidelity over generic web PDF combiners.
| Feature | CADConvert In-Memory Merger | Generic PDF Combiners |
|---|---|---|
| Vector Geometry Fidelity | 100% Lossless. Path instructions are preserved with infinite zoom | Often rasterizes or flattens vector drawings into low-res pixels |
| Embedded Fonts | Embedded Type1, TrueType, and OpenType fonts are cleanly merged | Font substitution errors and glyph mismatch |
| Page Rotations & Margins | Preserves individual page rotation flags (90°, 180°, 270°) | Forces uniform orientation, clipping blueprint viewports |
| Privacy & Data Security | 100% Volatile RAM. Files vanish immediately after streaming | Files stored in persistent temp disks or cloud S3 buckets |
| File Limit | Up to 25 MB per merged batch | Typically limited to 5–10 MB with ads |
Frequently Asked Questions
Does merging PDFs degrade vector lines or CAD blueprints?
No. CADConvert uses Apache PDFBox to perform lossless stream concatenation. Vector drawings, text layers, embedded fonts, and page orientations remain 100% untouched without any rasterization or degradation.
Can I reorder the PDF files before merging?
Yes. Use the up and down movement controls on each file card in the merge queue to arrange your documents in the exact order you want them combined.
Are uploaded PDF files stored permanently on disk?
Never. All documents are merged in volatile server RAM and streamed directly back to your browser. Files are purged immediately after the merge response completes.
Is there a limit on how many PDF files I can merge?
You can merge 2 or more PDF documents simultaneously up to the total upload buffer limit of 25 MB per request.