Merge PDF files into one

What Merge PDF does, and when you need it

Merge PDF puts several PDF files together into one, in the order you choose. Every page of every file goes in, copied exactly as it is, so text stays sharp and searchable and pictures keep their quality. It all happens inside your browser: nothing is uploaded, there is no sign-up and no watermark.

One file is easier to send, upload and keep than a handful: nothing goes missing and the pages stay in order. People merge PDFs for:

• Job and college applications. A cover letter, a resume and certificates as one file, because many portals take only one upload.
• Government, bank and visa forms. An application with its proofs in one PDF: Aadhaar and PAN card copies, bank statements or salary slips.
• Office reports. A cover page, tables from a spreadsheet and a colleague's appendix, joined into one report.
• Scanned documents. Many scanner apps save each scan as its own PDF. Merge them into one document.
• Study notes. Slides, handouts and your own notes for one subject in a single file.
• Legal papers and invoices. An agreement with its annexures, or a month of invoices for your accountant.

Merging PDFs, step by step

Here is exactly how the page works:

1. Add your PDFs. Press Choose PDF files and pick two or more, or drop them anywhere on this page, or paste PDF files you have copied. Files that aren't PDFs are skipped, with a short message.
2. Look at the cards. Each file becomes a card showing its first page, name, number of pages and size. The number in its corner is its place in the merged PDF.
3. Put them in order. Drag the cards until the numbers match the order you want. Remove a file with the × on its card (with a mouse, point at the card to see it), or add more with Add more PDFs.
4. Choose the bookmarks. One per file, the default, suits most people. Bookmarks explains the choices.
5. Press Merge. The button counts your files, as in "Merge 3 PDFs". A bar shows the work: reading the files, copying the pages, then writing the new PDF.
6. Download it. The result shows the new file's name, pages, size, how long it took and "nothing uploaded". Press Download to save it.

The merged file is named after your first file: if resume.pdf comes first, you get resume-merged.pdf. Your own files are not changed. If you move, add or remove a file or pick other bookmarks after merging, the Merge button comes back, so the PDF you download always matches the cards.

To try it first, press "Try with sample PDFs". It makes three small PDFs on your device, a one-page cover letter, a 2-page resume and 3 pages of certificates, which merge into one 6-page PDF.

Example: one PDF for a job or college application

Say a job portal wants "your resume and supporting documents as a single PDF". Here is the whole way:

1. Get every part as a PDF. Save the cover letter and resume as PDF from your word processor. For certificates you photographed, use JPG to PDF first.
2. Add them all here, then drag them into the order the portal asks for. If it doesn't say, a common order is cover letter, resume, then certificates, with the highest qualification first.
3. Keep One per file bookmarks, so the reader can jump straight to your resume or degree certificate.
4. Merge and check. Open the new file and check every page is there, in order and upright.
5. Fit the size limit. If the portal says "under 2 MB" and your file is bigger, see File size and upload limits.
6. Rename it if the portal wants a certain name, then upload it.

The same steps work for a college admission form (marksheets, transfer certificate, caste or income certificate), a visa file (passport pages, bank statements, an invitation letter) or a loan application (ID proof, salary slips and bank statements).

Getting the order right

The pages of card 1 come first, then those of card 2, and so on. Inside each file, the pages keep their own order. New files go to the end. To move a card:

• With a mouse, drag the card from anywhere and drop it in its new place.
• With a finger, drag it by the numbered handle in its top-left corner. Touching the rest of the card scrolls the page as usual.
• With a keyboard, press Tab until the handle is selected, then use the arrow keys to move the card one place at a time. Home and End send it to the start or the end. Screen readers announce each move.

A few tips save time:

• Number your files. Names like 1-cover-letter.pdf and 2-resume.pdf often arrive in the right order, since many devices list files by name.
• Look at the first page on each card. It tells two similar files apart, such as two marksheets with nearly the same name.
• Need single pages moved? Merge keeps each file's pages together. To move one page between files, use Organize PDF, which mixes pages from several PDFs.

Bookmarks: the three choices explained

Bookmarks are the clickable table of contents many PDFs carry. Most PDF readers show them in a side panel, often called Bookmarks or Outline. When you merge, you choose what the new file's bookmarks look like:

An example. Say you merge a cover letter, a resume and your certificates, and only the resume has bookmarks of its own: Experience and Education. With One per file, the panel shows three bookmarks, one named after each file, and the resume's bookmark opens to show Experience and Education. With Keep theirs, the panel shows only Experience and Education. With None, it is empty.

Every page goes in, so each bookmark still leads to its page, even though that page now has a new number.

Why every page stays exactly as it was

Redrawing pages, or turning them into pictures, can blur text and make it unsearchable. Merge PDF does neither: it copies each page's text, fonts, pictures and drawings into the new file exactly as they are:

• Text stays text. You can still search it, select it and copy it.
• Pictures and scans keep every pixel. Nothing is compressed again, so nothing gets blurry.
• Each page keeps its size, crop and rotation. An A4 page stays A4 and a landscape page stays landscape, even next to a Letter page from another file.
• Links keep working. Links that jumped to a named place in a file (a named destination) become direct links to their page.

The small pictures on the cards are only previews to help you sort. They don't go into the PDF.

Real results from our tests

We merged these files in Chromium 141, the open-source browser Google Chrome is built on, on a Linux computer with 4 processor cores and 16 GB of memory. "Before" is the files' sizes added together; times are what the page reported. Your device may be faster or slower.

• 0.1 sto merge the three sample PDFs into 6 pages
• 0.9 sto add a 14-page paper to a 117-page textbook
• 100%of the files' sizes added together, for three scans
• 0 bytessent to any server

Before and After are close, because every page is copied as it is, not compressed. We drew every page of the merged PDFs made from our own files with pdfium, the PDF engine inside Chrome, and compared it with the page it came from: every page matched. In the merged forms, all 16 fields could still be filled in, and the second copy's fields had been renamed, like Last Name to Last Name_2, so each copy kept its own answers.

Merging the 455 MB scan made the browser use about 1.9 GB more memory than when idle, roughly four times the size of the files, because the files and the new PDF are all held in memory while it is made. Each merge runs in a fresh background worker that closes when it is done, which hands its memory straight back to your device.

File size and upload limits

A merged PDF is about as big as your files added together: three files of about 1 MB each give about 3 MB. Pages are copied with their pictures and fonts, so merging doesn't make files smaller.

That matters when a portal sets a limit, like "one PDF, under 2 MB". Here is what to do:

1. Merge first, then make it smaller. Put the merged PDF through our PDF compressor. Shrinking the one file, not each part, means you don't have to guess how much room each part may take.
2. For an exact number, use Resize PDF. If the limit is a number like 500 KB, Resize PDF makes the sharpest version that fits under it.
3. Send only the pages they ask for. All pages share one limit, so each page you leave out, like a blank back side, gives the rest more room. Organize PDF removes pages.

Scans and photos are what make PDFs big. Typed text takes little room, so merged letters and forms often fit a limit as they are.

Scanned pages and phone photos

Merge PDF works with PDF files. If some documents are photos on your phone, such as a marksheet or an Aadhaar card, make them into a PDF first:

1. Open JPG to PDF, add the photos, put them in order and choose A4 if it may be printed.
2. Convert and download. Your photos go in at full quality.
3. Come back here and merge that PDF with your other files.

If all you have are photos, JPG to PDF alone makes them one PDF, with no merge needed.

Scanner apps often name files by date and time. Those names say little, so sort by the first page on each card, and give the merged file a clear name.

A page that was scanned sideways stays sideways, because each page keeps its own rotation. Turn it upright with Rotate PDF, before or after merging.

Forms, links and the other parts of a PDF

A PDF holds more than its pages. Here is what happens to each part when you merge several files:

Forms. Say you merge two copies of one form, filled in for you and for your spouse. Both have a field called Name. In the merged PDF, the second becomes Name_2, so each keeps its own answer.

The title. Some PDF readers show a document's title, not its file name, at the top. The merged PDF takes the first file's title, so it may show your cover letter's title.

Tags. If you need a tagged, accessible PDF, combine the parts in the program that made them and save a tagged PDF from there.

Locked, protected and signed PDFs

• A password to open it. A PDF that needs a password to open can't be merged. Its card says "Locked with a password. Unlock it first, then add it again." Statements sent by email are often locked this way. Open it with its password and save a copy without one (in Chrome: open it, type the password, then Print and Save as PDF), then add that copy.
• Editing restrictions. A PDF that opens without a password but doesn't allow changes can be merged, and the merged PDF opens without those restrictions. The result tells you so.
• A digital signature. A signed PDF, such as an e-signed agreement, can be merged, but the merged copy no longer carries a valid signature, since the signature covers only the file as it was signed. The result says so. If someone must check the signature, send the original too.

Private: your files stay on your device

The papers people merge are often private: ID cards, salary slips, bank statements, medical reports. With NoUploadPDF they never leave your phone or computer:

• Previews on your device. pdf.js, running in your browser, draws the pictures on the cards.
• Merging on your device. Our pages engine, written in Rust and compiled to WebAssembly, builds the new PDF in a background worker in your browser, so the page stays responsive.
• No way out. The page's Content Security Policy tells your browser to block it from sending data to other sites, so it couldn't upload a file even by mistake.
• No account. There is no sign-up and no watermark.

You can check in your browser's network panel that no file is sent. Our privacy policy has the details.

Compared with tools that upload your files

Many online PDF tools upload your files to their servers to merge them. Here is how that compares with doing the work on your own device:

Many upload-based tools are well made, and some promise to delete your files after a while. A file that is never uploaded needs no such promise, and on a slow connection, big scans don't have to travel to a server and back.

After merging: organize, split, compress and print

Once your files are one PDF, our other tools take it further, all on your device:

• Organize PDF moves, deletes, copies or turns single pages.
• Split PDF takes pages back out, or cuts the file into parts by page ranges.
• Rotate PDF turns sideways or upside-down pages the right way up.
• Compress PDF makes the file smaller for email and sharing.
• Resize PDF fits it under an exact limit, like 200 KB, or makes every page A4.

Printing. Each page keeps its own size, so a file can mix A4 and Letter pages. Choose Fit to page (or Fit to printable area) in the print window to scale each page to the paper, and check the preview. To make every page A4, use Resize PDF first.

Sharing. Give the file a clear name, like Priya-Sharma-application.pdf. Keep your separate files too, in case one part changes and you need to merge again.

Merge PDFs on Android, iPhone, Windows and Mac

There is nothing to install: the merger runs in any up-to-date browser, with no app, extension or account.

• Android

  Open this page in Chrome and tap Choose PDF files. To pick several at once, touch and hold the first file, then tap the others. Drag cards by their numbered handle. The merged PDF is saved to your Downloads folder.

• iPhone and iPad

  Open this page in Safari, tap Choose PDF files and pick your PDFs in the Files app. Save a PDF from Mail or WhatsApp to Files first. The merged PDF usually goes to Downloads in the Files app.

• Windows, Mac, Linux, Chromebook

  Click Choose PDF files and hold Ctrl (Cmd on a Mac) to pick several, or drag them from a folder and drop them anywhere on the page. The merged PDF goes to your Downloads folder.

For very big files, a computer is the better choice, as it usually has more memory than a phone.

Problems and quick fixes

• The button says "Add one more PDF to merge". Only one file can be used so far. Add another: a card that shows a warning doesn't count.
• A card says "Locked with a password". The file needs a password to open. Unlock it as shown in Locked, protected and signed PDFs, then add the unlocked copy.
• A card says "This file can't be read as a PDF. It may be damaged." It may not have downloaded fully. Download it again or ask the sender for a new copy. A card with a warning has no number and is left out.
• "Only PDF files work here." Photos and Word files can't be merged as they are. Turn photos into a PDF with JPG to PDF, and save Word files as PDF from Word.
• A card shows "No preview". The browser couldn't draw its first page, but the file is still merged. Check it in the result.
• "These files are too big to handle in this browser's memory." Close other tabs, merge in two rounds (half the files, then that result with the rest), or use a computer.
• The order is wrong in the merged PDF. Your cards are still there: drag them into place and press Merge again.

Limits

• PDFs that need a password to open can't be merged until you unlock them.
• A digitally signed PDF's signature isn't valid in the merged copy.
• Tags for screen readers, page labels and XFA forms are left out when several files are merged.
• The title, author, attached files and scripts come from the first file only.
• Merging doesn't make files smaller. Use Compress PDF or Resize PDF afterwards.
• Whole files go in. To merge only some pages, merge first, then remove the others with Organize PDF.
• We set no limit on size or number of files, but your device's memory is a limit, and phones have less of it than computers.

PDF terms, explained

Bookmarks (outline)

A PDF's clickable table of contents, shown in a side panel of most PDF readers.

Named destination

A named place in a PDF, such as the start of a chapter, that links can point to by name.

Page label

A custom page number, like i, ii, iii for an introduction, that a PDF reader shows instead of the plain number.

Tags

A hidden map of a PDF's headings, paragraphs and tables that screen readers use to read it aloud in the right order.

Digital signature

A code inside a PDF that proves who signed it and that it hasn't changed since. A merged copy is a changed file, so its signature is no longer valid.

WebAssembly

A way for web pages to run fast programs inside the browser. Our pages engine runs this way, on your device.