Combine several PDFs into one ordered document. Drag thumbnails to set the page order, then download a clean combined file with no quality loss.
Combining multiple PDF files into one document is one of the most common PDF tasks — for contracts, reports, portfolios, and more. PDFwarp merges your PDFs instantly in the browser with no quality loss and no signup required.
Files are merged in the order they appear on screen. Rearrange the thumbnails before clicking Merge — reordering after the fact means starting over.
Free accounts allow 25 MB across all files combined (10 MB without an account). If you're close to the limit, run each source PDF through Compress PDF first — you'll usually shave 30-60% without visible quality loss.
Merging five 20-page scans produces a single, hefty file. If you need searchable text later, run each scan through AI Scan to Text before merging so the result stays usable.
For documents you'll continue editing, a merged PDF loses its section boundaries. Bookmarks inside one source PDF often work better for navigation.
PDFwarp merges with pypdf at the object level: each page's content stream, fonts, and images move into the combined file exactly as they were stored in the source. Nothing is rasterized, recompressed, or redrawn — which is why merging two 5 MB files gives you roughly a 10 MB file with pixel-identical pages, not a degraded copy.
Each upload is checked for a real PDF header (the %PDF magic bytes), then opened by a strict parser before any writing begins. If one file is corrupt, you get told which one by number — instead of a half-merged document that fails on page 34.
The thumbnail grid doesn't just send file order — it submits an explicit page map (which file, which page, in which position). The server assembles exactly the sequence you arranged on screen, including interleaved pages from different source files.
No file count limit. Total size: 10 MB for guests, 25 MB for free accounts, 500 MB for Pro.
Yes — files are merged in the order you upload them. You can drag to reorder before clicking Merge.
Yes — use the Reorder Pages tool first, or arrange your uploaded files in the order you want before merging.
No. PDFwarp copies pages exactly as-is — no re-rendering, no quality loss.
No. Files are deleted from our servers immediately after your download.