Merge PDF
Last updated: 23 October 2026
Combine multiple PDF files into one document, in the order you choose — free, in your browser, with nothing uploaded.
Your files are read and combined on this device only — they are never uploaded to a server. Pages are copied in the order shown in the list; use Move up and Move down to arrange them before merging.
Why this tool is private
Your PDF and image files are read and rebuilt in this tab with a JavaScript library — open your browser's network tab and check: no upload request is ever made. No sign-up, no uploads, nothing to install.
How to use the Merge PDF
- Click Choose PDF files and select the PDFs you want to combine — you can pick more later and they are added to the end of the list.
- Check the list order: files are merged top to bottom, so the page order in the result follows this list exactly.
- Use the Move up and Move down buttons to reorder files, and Remove to drop one you added by mistake.
- Press Merge PDFs. Your browser reads each file in turn and copies all of its pages into one new document.
- The combined file downloads as merged.pdf, and the success line confirms how many pages it has and its file size.
About this Merge PDF
This PDF merger combines two or more PDF files into a single document, appending each file's pages in exactly the order you set in the list. It is the quick fix for upload forms that accept only one file, email inboxes with attachment limits, and folders full of single-page scans that belong together. Because the merge happens in your browser with a JavaScript PDF library, your documents are never uploaded to a server — the combined file is built on your device and downloaded straight back to it, with every page copied across unchanged.
How merging works in your browser
Most online PDF mergers ask you to upload your documents to their server, wait in a queue, and download the result — which means your files spend time on a stranger's computer. This tool does the same job without that step. When you press Merge PDFs, a JavaScript PDF library loaded by this page reads each file you selected, copies its pages one by one into a new blank document in the order of your list, and saves the result as merged.pdf, all inside the browser tab.
Because pages are copied rather than rebuilt, the contents of each page — text, images, vector drawings, embedded fonts — move across untouched; the library never renders or recompresses them. The practical consequence is speed and privacy: there is no upload or download queue, the merge is limited only by your device's memory, and a document you would not email to a stranger never leaves your machine. It also means the tool works offline once the page has loaded.
Worked example: one application pack from four files
A visa or job portal asks for 'a single PDF' and you have four: a scanned application form, a passport page, a bank statement and a covering letter, each its own file. Add all four with the file picker, then use Move up and Move down until the list reads form, passport, statement, letter — the order a caseworker expects to read them in.
Press Merge PDFs and the tool appends the files in that order: if the form has 2 pages, the passport 1, the statement 3 and the letter 1, the result is a 7-page merged.pdf, which the success line confirms before you upload it anywhere. If you spot a mistake — the statement in front of the form, say — just fix the list and merge again; each run builds a fresh file from the originals, which are never modified.
Merge, or keep the files separate?
Merge when a person or a portal needs to read or receive the documents as one story: applications, contracts with their annexes, chapters of a report, a month of invoices for your accountant. A single file is easier to attach, archive and search, and page order becomes something you control once instead of something every reader has to reconstruct from filenames like scan_final2.pdf.
Keep files separate when they will be handled independently — edited by different people, re-sent at different times, or stored in different places. A merged file is also harder to partially update: replacing one statement inside a 40-page pack means rebuilding the pack. A common middle path is to keep your originals separate and treat the merged PDF as a disposable output you regenerate whenever the contents change.
Honest limitations of this merger
Three limits are worth knowing before you rely on it. Password-protected files cannot be opened, so the merge stops and names the offending file; unlock it elsewhere first. The document outline — bookmarks and the clickable table-of-contents panel — is not carried into the merged file, because the pages are copied without the source documents' outline structure. And attachments embedded inside a source PDF are not brought across.
There is also a scale limit set by your hardware rather than by any rule of ours: everything happens in your browser's memory, so merging very large scans — hundreds of megabytes — can strain a phone or an old laptop. Splitting the job into two merges (merge the first half, then merge the result with the second half) usually gets around it. For everyday documents, none of this is likely to be felt.
How it works
Add two or more PDF files, arrange them in the order you want, and this tool copies every page into a single new document that downloads as merged.pdf. Pages are copied exactly as they are — no recompression and no quality loss — and the whole merge runs in your browser using a JavaScript PDF library, so contracts, statements and scans are never uploaded to a server. There is no sign-up, and no file ever leaves your device.
Privacy note: this tool runs locally in your browser. Your input is not uploaded, stored in analytics, or placed in the page URL.
Frequently asked questions
Are my PDF files uploaded to a server?
No. The merge runs entirely in this browser tab using a JavaScript PDF library: your files are read from your device, combined in memory, and the result is downloaded straight back to you. Nothing is sent to a server, stored in an account or kept after you close the page, which makes the tool safe for contracts, bank statements, ID documents and other files you would not want to hand to a website.
Can I merge a password-protected PDF?
No. This tool cannot open PDFs that need a password, because it has no way to decrypt them. If one of your files is protected, the merge stops and the error names that file so you know which one to fix. Unlock it first in the program that created it — many PDF readers can save an unprotected copy once you enter the password — then merge the copy.
How is the page order decided?
Entirely by the list on this page. Files are merged from top to bottom, and within each file its pages keep their original order, so the first file's pages come first, then the second file's, and so on. Use Move up and Move down to arrange files before merging, because pages cannot be reordered inside the finished PDF afterwards.
Will my bookmarks and links survive the merge?
The pages themselves are copied exactly, including any links drawn on the page, but the document outline — the bookmarks or table-of-contents panel that some PDFs show in a sidebar — is not carried across by this tool, and neither are file attachments or form-field structure. If your document depends on a bookmark panel for navigation, build the merged file in a full desktop PDF editor instead, or add a contents page as the first file in the list.
Is there a limit on file size or number of files?
There is no fixed limit built into the tool, but the practical limit is your device's memory: every file is read into the browser tab and held there while the merged document is built. A handful of ordinary documents is effortless; merging hundreds of megabytes of scanned pages can slow down or exhaust a phone or an older laptop. If a merge struggles, try fewer or smaller files, or do it in two passes.
Does merging change the quality or content of my pages?
No. Pages are copied from each source file into the new document as they are — the text, images, fonts and resolution inside each page are not recompressed, resampled or rewritten, so a sharp scanned page stays sharp and selectable text stays selectable. The merged file can still differ slightly in total size from the sum of the originals, because shared resources and document metadata are written once rather than repeated for every file.
Can I merge files on my phone?
Yes, as long as your phone's browser is reasonably current. The tool runs in the browser, so it works the same on Android, iPhone, Windows, Mac and Linux with nothing to install, and it keeps working offline once the page has loaded. Keep the tab open while a large merge runs — switching away for a long time can let the phone suspend the tab and interrupt a big job.
Related tools
PDF Tools
Image to PDF Converter
Turn JPG, PNG and other images into one PDF — one image per page, on A4, Letter or fit-to-image pages. Free, private, in your browser.
Image Tools
Image Compressor
Compress JPG, PNG and WebP images in your browser with an adjustable quality slider, before/after sizes and no uploads.
Image Tools
Image Format Converter
Convert one image at a time between PNG, JPG and WebP in your browser, with a background colour you choose wherever JPG replaces transparency.