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Summarize, ask questions, or extract key data — AI reads your PDF in seconds.
Drag and drop files to arrange them in any order before merging
All processing happens in your browser — files never leave your device
Merge unlimited PDFs with no daily caps or file size restrictions
Merging PDFs means combining multiple PDF documents into a single file while preserving the formatting, fonts, images, and links from each original document. Filator's PDF merger does this entirely in your browser — your files are never uploaded to any server. Up to 20 PDFs, 100MB each, with drag-and-drop reordering. No signup, no watermark, no daily limits.
Most "free" PDF mergers — iLovePDF (217 million monthly visits), Smallpdf (35 million visits), and Adobe Acrobat Online — upload your documents to their servers for processing. That means your contracts, invoices, and personal files sit on someone else's infrastructure. Filator processes everything client-side using a Web Worker — zero server involvement, which also makes it faster since there's no upload/download wait.
Filator processes PDFs locally using a Web Worker. No server upload, no cloud processing, no temporary file storage. If you're merging NDAs, financials, or medical records — they stay on your machine.
The merged PDF is clean. No "Merged with Filator" stamp, no degraded quality, no "upgrade to remove branding" popups. What goes in is what comes out.
You don't need to sign up, verify an email, or hand over any personal information. Open the page, merge your files, close the tab. That's it.
Merge as many times as you want. No "3 tasks per hour" cap like Sejda, no daily limits, no premium tier required for batch operations.
| Feature | Filator | iLovePDF | Smallpdf | Sejda |
|---|---|---|---|---|
| Processing | In your browser | Server upload | Server upload | Server upload |
| File Size Limit | 100MB per file | 100MB total | Varies | 50MB/file (free) |
| Max Files | 20 | 25 (free tier) | Varies | Varies |
| Usage Limits | Unlimited | Limited free tier | 2 tasks/day (free) | 3 tasks/hour |
| Watermark | Never | No (free tier) | No | No |
| Account Required | No | No | No | No |
| Custom Metadata | Yes | No | No | No |
The biggest difference is where your files go. With iLovePDF, Smallpdf, and Sejda, your PDFs are uploaded to their servers, processed there, and stored temporarily (usually 1-2 hours) before deletion. With Filator, nothing leaves your browser. The merge happens locally, which also makes it faster — no upload/download wait.
Combine multiple invoices into a single file for accounting, or merge contract pages with appendices and signature pages.
Visa applications, college admissions, job applications — they all want one PDF. Merge your resume, cover letter, transcripts, and certificates.
Combine departmental reports, analytics, or meeting notes into one document before sharing with stakeholders.
Scanned 15 pages and got 15 separate PDFs? Merge them into one file in seconds. Reorder pages if the scanner got them out of sequence.
Adobe Acrobat Pro ($19.99/month) is the traditional way to combine PDF files, but it's expensive and requires desktop software. Adobe's free online merger also uploads your files to their servers. Filator merges PDFs entirely in your browser — no software, no subscription, no server upload. The result is identical: one combined PDF with all pages in order.
Other free alternatives include macOS Preview (drag thumbnails between windows) and the command-line tool Ghostscript, but both require desktop software. Filator works on any device with a browser — including phones, Chromebooks, and shared computers where you can't install software.
Need to do more with your PDFs? Filator has a full set of free PDF tools, all processed in your browser:
Drop your PDF files into the upload area or click to browse. Reorder them by dragging (desktop) or using the arrow buttons (mobile). Optionally add a title and author in the metadata section. Click "Merge PDFs" and download your combined file. The whole thing takes seconds and happens entirely in your browser.
Yes. Filator processes your PDFs entirely in your browser using a local Web Worker. Your files never get uploaded to a server — they don't even leave your device. Most competing tools upload your documents to their servers for processing, which means your data sits on someone else's infrastructure temporarily.
Each PDF can be up to 100MB, and you can merge up to 20 files at once. There are no daily or hourly usage limits — merge as many times as you need.
No. Filator copies pages directly from the source PDFs without re-encoding or compressing anything. Fonts, images, links, and vector graphics stay identical to the originals.
No. Filator never adds watermarks to your files. The merged PDF is clean and ready to share — no paid upgrade required to remove branding.
No. The merge tool works without any account, login, or registration. Open the page, merge your files, download the result. If you want to access Filator's AI tools or save history, you can optionally create an account — but it's not needed for merging.
Yes. The tool works on all modern mobile browsers — Safari on iOS, Chrome on Android, and others. On mobile, use the arrow buttons to reorder files instead of drag-and-drop.
Filator can handle some encrypted PDFs automatically. For fully locked files, use the Unlock PDF tool first to remove the password, then merge.
Open Filator in any browser, drag and drop your PDF files, reorder them, and click Merge. No Adobe Acrobat, no software download, no subscription. Everything processes in your browser.
Yes. Filator processes entirely in your browser using client-side JavaScript. Your files never leave your device. iLovePDF, Smallpdf, and Adobe Online all upload your files to their servers.
Top options: iLovePDF (most popular, 217M visits), Smallpdf (ISO 27001), Adobe Online, and Filator (only one with client-side processing). Choose iLovePDF for simplicity, Filator for privacy.
Yes. Drag and drop files to rearrange on desktop, or use arrow buttons on mobile. The order you set is the order pages appear in the merged document.
Bottom line: Filator's PDF merger combines up to 20 files (100MB each) entirely in your browser — no server upload, no signup, no watermark. This is the key difference from iLovePDF (217M visits), Smallpdf, and Adobe Online which all upload your files. Filator also adds custom metadata (title, author) and supports drag-and-drop reordering. Zero quality loss — pages are copied directly without re-encoding.