Merge PDF
Local Processing (Offline Capable)Merge PDF files in the order you choose — combine multiple documents into one, right in your browser with no upload (combined size up to 10MB); larger totals can use the Pro cloud large-file merge on the page (sign-in required).
How this tool works (no sign-up needed)
- Upload your file above. Each tool shows whether it runs Local (in your browser) or Cloud (encrypted servers).
- Adjust options, then click the Run / Convert / Process button.
- Wait for progress, then download the result. Use Next tools to continue.
If buttons are not visible, enable JavaScript — the interactive workspace loads in your browser.
Free · Local processingFiles are not uploaded — merging runs in your browser
Supports application/pdf
Import from linkPaste a direct PDF link (e.g. a Google Drive/Dropbox shared direct-download URL)
Pro · Process in cloud
Pro large-file merge · Sign in with Pro required
What is it?Merge PDF is a PDFLean page organization tool: Combine multiple PDFs into one, in order.
TL;DR: Combine multiple PDFs into one, in order. As long as the combined size is 10MB or less, everything runs locally in your browser — your file is never uploaded and closing the tab clears it; larger totals can use the Pro cloud large-file merge on the page (sign-in required, results auto-deleted after 24 hours).
Measured: ~14 ms median on a typical sample — full benchmark table below.
This tool merges several PDF files into a single document, keeping the pages of each input in the order you arrange them. Processing runs entirely in your browser — no upload, no account — and closing the tab clears the intermediate data. The output is one combined PDF, ready to download or to chain into compression or linearization for web publishing. Key limitation: the combined size of all inputs is capped at 10 MB because the whole merge happens inline in your browser; larger totals go through the Pro cloud large-file path on the page (encrypted upload, sign-in required, results auto-deleted after 24 hours).
About this tool
A focused utility built for a single recurring document task. Combine multiple PDFs into one, in order. For interleaving front/back scans use Alternate & Mix; for single-file page ops use Page Organizer. Merges up to 10 MB run locally in your browser's memory — nothing is transmitted and closing the tab clears it completely; larger totals go through the Pro cloud large-file path (encrypted upload, sign-in required, results auto-deleted after 24 hours). The workflow is deliberately short: load the file, choose the options on the page, run the operation, and save the result. Every choice is applied before the file is written, so re-running with different settings takes seconds. Practical limits apply (combined file size up to 10MB); it pairs well with the related tools linked beside this page when one step is not the whole job. Key facts — Processing: merges up to 10MB run entirely in your browser, client-side; larger totals use the Pro cloud path; Access: local merge is free with no account required; Pro cloud needs sign-in; File limits: combined size up to 10MB locally; Privacy: local merge never leaves the device; Pro cloud uploads over an encrypted channel with 24-hour auto-deletion. Measured by a benchmark of the pdf-lib merge path (three 8-page PDFs): ~14 ms at the median — merging is a millisecond-scale local operation; perceived wait comes from file loading, not processing.
Measured performance benchmarks
| Sample | Input | Output | Median time | Size change |
|---|---|---|---|---|
| 3 × 8-page text PDFs merged | 65 KB | 64 KB | 14 ms | −1% |
Measured locally in your browser (isomorphic production code; samples are programmatically generated text PDFs, median of 5 runs). Real-world image-heavy PDFs differ — see the on-page limits.
How to use
Add 2 or more PDF files via the upload area (drag-and-drop or multi-select)
Reorder with the up/down buttons or sort files by name
Click "Merge PDF" — done locally in your browser (combined total ≤ 10MB; larger totals use the cloud large-file entry on the page)
Download the merged file (optional table of contents)
Watch: merge PDF files in 75 seconds
Combine separate documents into one PDF — free, with no upload and no sign-up. The video player loads only after you press play.
FAQ
Will my file be uploaded?
No — for combined sizes up to 10MB, the whole merge runs in your browser and nothing is uploaded; closing the tab clears it. If the total exceeds 10MB, the page offers a Pro cloud large-file merge: files are uploaded over an encrypted connection, results are auto-deleted after 24 hours (instant shred anytime), and sign-in is required.
Are there any limits?
The combined size of all files must be 10MB or less (processed inline in your browser); for larger batches, the page offers a cloud large-file merge (Pro sign-in required).
Can I choose the processing order?
Yes — files appear as cards; use the up/down buttons or sort by name to reorder before running.
Can I process multiple files in bulk?
A single tool page handles one task at a time; for bulk work use the Batch Processing workflow and add this tool as a step to run a whole set at once.
Is the processed file still editable?
The output is a reorganized new PDF; the original stays intact and you can re-run as many times as you like.
How do I compress a merged PDF without uploading it?
Rebuild the object streams locally after merging — the compression guide covers the local-only flow and its memory limits.
Read the guide: Compress a PDF Without Uploading ItEmbed this tool
Embed this tool on any website for free. Files are processed entirely in each visitor's browser — nothing is ever uploaded to any server.
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