Merge multiple PDF files into one document online. Combine PDFs in any order, rotate individual pages, and download the merged result. 100% free, no uploads, fully private. Best free online PDF merger.
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PDF only · 50 MB per file · 250 MB total
50 MB
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~5 seconds
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Split PDF files into multiple documents online. Extract specific pages by range, split into chunks of N pages each, or export every page as a separate PDF. All processed locally in your browser.
Rearrange, rotate, and delete pages in your PDF files online. Reorder pages by drag-and-drop, rotate individual pages, remove unwanted pages, and download a perfectly organized PDF — all processed locally in your browser.
Crop PDF pages by removing unwanted margins. Drag the crop handles to select the visible area, choose from preset aspect ratios, and apply to all or specific pages — all processed locally in your browser.
Delete unwanted pages from your PDF files online. Select pages to remove from a visual thumbnail grid, keep only the pages you need, and download a clean PDF — all processed locally in your browser.
Rotate individual PDF pages or all pages at once. Clockwise 90°, counter-clockwise 90°, or 180° rotation. Visual thumbnail grid, batch rotate all, reset all — all processed locally in your browser.
Add page numbers to your PDF files with custom positioning. Choose from 6 preset positions (top-left, top-center, top-right, bottom-left, bottom-center, bottom-right), drag to reposition, skip specific pages, and preview changes live — all processed locally in your browser.
Combining multiple PDF files into a single document is a common need whether you are consolidating receipts for expense reports, merging scanned contracts, compiling research papers, or joining presentation slides. The Merge PDF tool lets you combine several PDF files into one cohesive document quickly and easily — all directly in your browser with no file uploads to any server.
You can add PDF files one at a time or drag and drop multiple files at once. Each file appears as a visual card with a thumbnail preview of its first page, file name, size, and page count. If a page orientation is wrong, you can rotate individual PDFs by 90-degree increments before merging. The tool preserves the order you add files, and a clear number label on each card helps you keep track of the sequence.
Once you are happy with the order and orientation, click Merge and a 5-second processing spinner provides clear visual feedback while the tool combines your files using the pdf-lib library — a professional-grade PDF manipulation engine. The result is a single merged PDF that you can download or share directly from your browser. All processing is 100% local, so your documents never leave your computer.
Tip: Add files in the order you want them to appear in the final document. The merge order follows the visual order shown in the grid.
Input:
File 1: cover-letter.pdf (2 pages, 1.2 MB)
File 2: resume.pdf (3 pages, 850 KB)
File 3: references.pdf (1 page, 420 KB)Output:
merged.pdf (6 pages, 2.5 MB)The tool combines all six pages from the three source files into a single PDF. Page order follows the file order: cover-letter page 1, cover-letter page 2, resume page 1, resume page 2, resume page 3, references page 1. Individual page content, formatting, fonts, and images are preserved exactly as they appear in the original files.
There is no hard limit on the number of PDF files you can add, but the total combined size of all files must not exceed 50 MB. If you need to merge more files than fit within this limit, consider merging in batches or compressing individual PDFs first using our PDF Compressor tool.
Currently, files are merged in the order they were added. We recommend adding files in the sequence you want them to appear in the final document. You can remove a file and re-add it later to change its position in the merge order.
No. Rotation is applied only during the merge process. The original file on your device remains unchanged. The rotation angle is applied to every page of that specific PDF document in the merged output.
The tool uses pdf-lib, a professional PDF manipulation library that preserves all existing content, formatting, fonts, images, and vector graphics from each source PDF. Text remains selectable and searchable in the merged output.
The tool attempts to load PDFs with encryption disabled. Password-protected PDFs that require a password to open cannot be read by the browser and will fail to load. You must remove the password protection before merging.
Absolutely. All processing happens entirely in your browser using client-side JavaScript. Your PDF files are never uploaded to any server. The tool uses pdf-lib running directly in your browser to read, modify, and merge your documents. Your data never leaves your device.
Yes, the tool is fully responsive and works on any modern mobile browser. You can add PDFs from your phone or tablet storage, and the thumbnail grid adapts to your screen size with responsive columns.
The merge process copies page content including text, images, and vector elements. Advanced PDF features like bookmarks, annotations, form fields, and internal links may not be preserved in the merged output. For such cases, consider using dedicated PDF editing software.
The tool displays a 5-second spinner to provide consistent visual feedback. The actual merge time depends on the number of pages and total file size. Small files merge almost instantly, while larger combinations may take slightly longer. The spinner ensures you always see a clear transition from input to output.
Yes. Each source PDF retains its original page size in the merged document. This means you can combine letter-size, A4, and custom-size pages into a single PDF. Page sizes are not normalized or modified.
Yes, the Merge PDF tool is completely free with no hidden costs, subscriptions, or premium tiers. There are no watermarks, usage limits, or registration requirements. You can merge as many PDFs as you need.
Yes, the tool works with any PDF, including scanned documents. Scanned PDFs contain embedded images of each page, and these images are preserved in the merged output just like text-based pages.
Only PDF files with the .pdf extension and application/pdf MIME type are supported. Other file types will be rejected with a clear error message. To merge other document types, convert them to PDF first using our HTML to PDF or image to PDF converters.
The Merge PDF tool is designed to combine multiple PDFs into one. If you only have a single PDF, there is nothing to merge. You can use other tools in our suite like the PDF Compressor to reduce its file size or the JPG to PDF / PNG to PDF converters to add more pages from images.