Merge PDF Online — Combine Multiple PDFs Free
Combine multiple PDF documents into a single file instantly in your browser. Up to 20 PDFs at once, no upload, no signup, no watermark — your files never leave your device.
How to merge PDF files
Drop your PNG images into the box above. You can add multiple files at once.
Adjust the quality slider if available — higher quality means larger files.
Click Merge PDFs — pages are combined into a single PDF in your browser.
The merged PDF is built entirely in your browser using pdf-lib (WebAssembly). Nothing is uploaded.
How to merge PDF files in 3 steps
First, drop or select 2 or more PDF files into the upload area. Second, verify they appear in the order you want — files merge in the sequence you added them. Third, click Merge PDFs — pdf-lib combines them into a single PDF in your browser, ready to download. The entire process takes under 10 seconds for typical files.
What is the best free PDF merger?
A best free PDF merger is judged on three criteria: privacy (does it upload your files?), quality (does it preserve fonts, links, form fields?), and convenience (signup required? daily limits?). ConvertFilesNow scores best on privacy by processing entirely in your browser, preserves all PDF content using pdf-lib, requires no signup, has no daily limit, and adds no watermark.
Merge PDFs without losing quality
Combining PDFs through this tool is lossless. pdf-lib uses the copyPages API which transfers each page exactly as it appears in the source — every glyph, every embedded image, every form field, every hyperlink. The output PDF is bit-for-bit identical to the source pages, just bundled together. There is no recompression, no rasterization, no font substitution.
Privacy: your PDFs never leave your browser
Most online PDF mergers upload your files to remote servers and keep them for hours. For contracts, invoices, medical records, or any sensitive document, that is an unacceptable privacy risk. ConvertFilesNow runs pdf-lib as WebAssembly directly in your browser tab. There is no upload, no server-side processing, no logging — verify this yourself in DevTools.
ConvertFilesNow vs iLovePDF vs Smallpdf for merging
iLovePDF and Smallpdf upload PDFs to their servers and limit free users to 2-3 merges per day. Removing the limit requires a paid subscription ($6-15/month). ConvertFilesNow has no daily limit, no signup, no upload, and is permanently free. The tradeoff is no cloud storage integration — you upload local files only, which is intentional for privacy.
Common use cases for merging PDF files
PDF merging is one of the most frequent document workflows. Typical examples: combining a contract with its appendices into one submission file, bundling monthly invoices into a quarterly report, merging multi-page scans of a passport or ID, assembling individual receipts into an expense report, joining presentation slides exported as separate PDFs into a single deck.
Frequently asked questions
How do I merge PDF files for free?
You can merge PDF files for free at ConvertFilesNow by dropping 2 or more PDFs into the upload area and clicking Merge PDFs. The merge happens in your browser using pdf-lib (WebAssembly) — no signup, no upload, no watermark, no daily limit. The output is a single combined PDF ready to download.
Can I merge PDFs without uploading them?
Yes. ConvertFilesNow merges PDFs entirely in your browser using pdf-lib compiled to WebAssembly. Your files are never uploaded to a server, never stored, never logged. Verify in DevTools → Network tab that no PDF data leaves your device.
How many PDFs can I merge at once?
You can merge up to 20 PDF files in a single operation. There is no practical page limit beyond your browser memory — typical laptops handle hundreds of merged pages from multiple PDFs without issue.
Will the merged PDF be larger or smaller than the originals?
The merged PDF is approximately the sum of the input file sizes, sometimes slightly smaller because shared resources like fonts may be deduplicated. There is no recompression — the merge is lossless. To shrink the final file, use a PDF compressor after merging.
Can I reorder pages within the merged PDF?
Currently files merge in the order you upload them. To reorder, remove a file with its × button and re-add it where you want. Drag-to-reorder is on the roadmap.
Does merging preserve form fields, annotations, and hyperlinks?
Yes. pdf-lib copyPages preserves all interactive features: form fields (text inputs, checkboxes, dropdowns), annotations (comments, highlights), hyperlinks (internal and external), embedded fonts, and signature appearance. The combined PDF behaves identically to the sources.
What is the difference between merge and combine PDF?
Merge PDF and combine PDF mean the same thing: taking two or more PDF documents and joining them into one. The terms are used interchangeably. ConvertFilesNow handles both — drop your PDFs in upload order, click Merge, get one combined output PDF.
How does this compare to iLovePDF or Smallpdf?
ConvertFilesNow processes everything in your browser (no upload), has no daily limit, no signup, no watermark, and is permanently free. iLovePDF and Smallpdf upload to their servers, limit free users to a few merges per day, and require a paid subscription for higher quotas.
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