Merge PDF files made simpler, in your browser

Merging PDFs is often the last step before you share a packet: a cover letter, several exhibits, a scan, and a final page all need to travel together. This merge PDF tool joins selected pages from two or more PDF files into one downloadable document. It reads and processes the files in your browser. The source files stay on your device and the tool does not replace them. Before you download, you can check the file order, select only the pages you want from each source, and see the expected page count.

The tool copies existing PDF pages instead of turning every page into a screenshot. This matters for reports with selectable text, vector diagrams, or scans that already have a suitable resolution. Copying a page generally keeps its media dimensions and rotation. It does not mean that every document level feature survives: bookmarks, links, annotations, accessibility information, and signatures need separate review after a merge. If those features are essential to your workflow, inspect the downloaded result in your usual PDF reader before you send it onward.

1. Add files. Choose at least two PDFs from your device. Each file is checked before it enters the list. The tool displays its page count and flags mixed sizes or rotated pages. An unreadable, encrypted, or interactive form PDF is stopped with an error rather than silently included.
2. Put files in order. Use Up and Down beside each file, or select “Sort by filename” when your filenames contain meaningful numbers. Natural sorting puts document 2 before document 10. You can remove an accidental selection and add another file without starting over.
3. Choose pages. Leave a page range blank to use the whole file. Enter values such as 1-3,5 to keep only pages one through three and page five. Every file has its own range. The numbers refer to positions in that source PDF, starting at 1; they do not refer to page numbers printed on the paper.
4. Check the summary. The total number of selected pages is displayed before the merge. Correct a range if it is empty, repeated, reversed, or beyond the end of a source file. The list order and ranges together describe the output order.
5. Merge and download. Start the task and watch the completed-file progress. You can cancel a running merge and retry. The output is reopened by the processor to check that the page count matches the plan before a download link appears. Download the new file and review it in a PDF reader.

Suppose a submission needs an introduction from packet-1.pdf, a chosen chart from packet-2.pdf, and an approval page from packet-10.pdf. Add the three files and use filename sorting. Enter 1-2 for the introduction, 4 for the chart, and 1 for the approval page. The summary should say four output pages. The resulting PDF will follow the file list: two pages, then one page, then one page. If the chart has a landscape page, that page remains landscape; this tool does not resize it to match the others.

For a scanned application, you might have a front section in one PDF and supporting documents in another. If the first source contains a blank scan at position three, select 1-2,4-6 for that file. The merge will skip the third source page. This removes it from the new document while leaving the original scan untouched. If you need detailed page-by-page rearrangement, rotation, or blank-page insertion, those are separate editing tasks; the merge interface is designed around whole files and ranges from each file.

Some scanners produce one PDF of front sides and another PDF of back sides. Choose “Interleave front and back scans” to alternate pages from exactly two files. Put the front-side file first and the back-side file second. If the backs were scanned from the bottom of the stack upward, enable “Read back pages in reverse order.” The front selection must contain the same number of pages as the back selection, or one extra front page for a document whose final sheet has no reverse side. Check the resulting sequence carefully: the tool cannot tell from the page images whether a scanner fed the stack in the direction you expected. Interleaving changes page order but does not straighten scans or rotate page content.

A PDF page can carry its own width, height, and rotation. A Letter page, an A4 page, and a landscape scan can all appear in one combined document. This tool keeps those source properties instead of stretching a page to a new size. Different sizes in the downloaded file therefore do not by themselves indicate a failed merge. They reflect the input files. Check the intended printing requirements before sending mixed-size documents to a print shop or a submission portal.

Visible numbers printed on the pages are part of the source page content. If three source reports each say “Page 1” on their first pages, combining them does not rewrite those labels. The four-page example above might still show unrelated printed page numbers. The page counter in your PDF reader reflects the new file order, while the printed numbers reflect the originals. Add new visible numbering in a separate operation if you need one continuous sequence.

Files are read through your browser's local file interface and sent to a processing worker inside this page. The merge uses a browser library to copy selected pages and create a new PDF in memory. The tool does not upload the documents to a processing server. It creates a temporary browser download link for the output, and that link is cleared when you change the inputs or reset the task. The site may still make ordinary requests for its code, styles, and fonts, so local processing should not be confused with a promise that the entire site works offline.

For responsiveness, a task is limited to eight files, 30 MB for any one file, 120 MB in total, and 400 selected pages. These are conservative limits for this browser implementation, not PDF format limits. Complex pages can still consume significant memory, especially on mobile devices. If your collection exceeds the limits, divide it into smaller groups and inspect intermediate output before using it in another merge. Cancel a task if it is taking too long; the active processing worker is stopped.

Encrypted PDFs are rejected. A password prompt is not offered because the processing library does not decrypt protected files. If you have authorization to work with one, obtain an unencrypted copy through the document owner or your approved software first. Damaged or unsupported PDFs are also stopped instead of being treated as successful output. A failed file remains on your device, and you can remove it from the selection to retry the other inputs.

Interactive PDF forms are blocked from merging. A copied form page can appear correct in one viewer while its field tree is missing or a repeated field name behaves differently elsewhere. Rejecting it is safer than offering a download that might lose entered values. If you need to include a form, complete and export a suitable non-interactive copy using a trusted form workflow, then review the new file before adding it here. A visible signature on a page is different from a certificate-backed digital signature; modifying a signed PDF can invalidate the digital signature.

The output page count is checked automatically, but page count alone cannot prove that bookmarks, internal links, comments, attachments, tagged structure, and every visual element remained useful. Open the download in a reader other than the browser preview when the document is consequential. Scroll through the beginning, middle, and end; inspect unusual page sizes and rotated scans; search for representative text; and test any links or annotations that matter. This final review is particularly important for official forms, legal submissions, archival material, and documents that must meet accessibility standards.

The list from top to bottom is the output sequence. Use the Up and Down controls to make a deliberate order, or natural filename sorting for names such as part-1.pdf, part-2.pdf, and part-10.pdf. Confirm the list before starting. Sorting does not rearrange pages within a file; it changes the positions of whole input files.

Yes. Type a range separately for each file. 2-4,7 selects four pages from that source in ascending order. Leave the field empty to include all of its pages. Repeated pages and out-of-bounds positions are treated as errors so the total is predictable.

The sources may contain different paper sizes, orientations, or scan dimensions. The merge keeps each selected page's existing size and rotation. It does not normalize everything to A4 or Letter. If a recipient requires one paper size, resize pages as a separate, reviewed operation.

The tool copies PDF pages rather than rendering all pages to bitmap images, so it does not intentionally rasterize text or downsample every scan. Nevertheless, review a representative text page and image page in the output. Source quality cannot be increased by merging, and complex PDF features can behave differently across readers.

No. Encrypted files and interactive form documents are rejected by this tool. It does not bypass passwords or promise to preserve form field behavior. Use an authorized workflow to prepare a suitable copy, then check that copy before merging.

Select the interleave mode, place fronts before backs, and use the reverse-back option if the back stack was scanned in reverse order. The tool alternates selected front and back pages. Review the download page by page before sharing it.