Merge & Split PDF

Drop PDFs to merge, split, rotate or delete pages — images can become a PDF too. Everything runs in your browser, nothing is uploaded.

Drop PDFs or images here, or click to choose PDF · JPG · PNG · WebP · multiple files · nothing is uploaded

Privacy: PDFs are read and generated only inside this browser (pdf.js / pdf-lib). 17NAS servers never receive your files, file names or passwords, and results are discarded when you close the page.

Quick answer

Drop several PDFs here (JPG/PNG images can be mixed in), drag the cards or use the arrows to set the order, and press "Merge PDF" to build a new file in your browser. To split, switch to "Split" and enter page ranges (e.g. 1-3, 5, 8-) or choose every N pages or single pages; multiple results download as one ZIP. "Organise pages" shows thumbnails so you can drag pages into order, rotate, delete or extract a selection. Pages are copied as-is, so text stays selectable and quality is unchanged, and your files never leave your device.

How to use

Four steps: add files → order and merge → organise pages → split if needed.

  1. List of three added PDFs with thumbnails, page counts and sizes
    Step 1

    Add PDFs or images

    Drag PDFs into the dashed box or press "Choose files"; each image becomes one page. Every file shows its page count and size, and encrypted files are flagged.

  2. Merge tab: file cards with drag handles and arrows, merge button below
    Step 2

    Set the order and merge

    Drag the handle on the left or use the arrows to set the order, press "Merge PDF", and the result appears below with a Download button.

  3. Page thumbnail grid with some pages selected and rotated
    Step 3

    Organise pages

    Open "Organise pages" to see every page as a thumbnail: drag to reorder, rotate or delete single or selected pages, or extract only the selection.

  4. Split tab: page-range input, preview text and the list of split files
    Step 4

    Split and download

    In "Split", enter page ranges or choose every N pages or single pages; the preview shows how many files will be made, and "Download all (ZIP)" saves them in one go.

Back to the tool

Key facts at a glance

Price
Free, no sign-up, no watermark
Input
PDF; JPG, PNG, WebP, GIF, AVIF images (HEIC in Safari only)
What it does
Merge, split, extract, rotate, delete and reorder pages; images to PDF
Split modes
Page ranges (reverse allowed), every N pages, single pages; multiple results as ZIP
Quality
Pages copied as-is: text stays selectable, vectors and images are not recompressed
Encrypted PDFs
Open password required first; protected files are output as images (text not selectable)
Privacy
Processed locally in the browser; files and passwords are never uploaded
Browsers
Recent Chrome, Edge, Firefox and Safari, including iPhone and Android
Limits
Up to 100 files; a few hundred MB usually works on a computer, keep it under about 100 MB per run on phones
Last updated

Which split mode to use

For a 10-page PDF, each input produces the following:

Mode Input Result
Page ranges 1-3, 5, 8- 3 files: pages 1–3, page 5, pages 8–10
Ranges + one file 2, 4, 6-9 1 file with pages 2, 4, 6, 7, 8, 9 in that order
Every N pages N = 2 5 files of 2 pages each
Every page — 10 single-page PDFs, downloadable as a ZIP
Reverse order 10-1 1 file with the page order reversed

How it works and things to know

Merging and splitting are done with the open-source pdf-lib library, which copies page objects (text, fonts, vectors, images) straight into the new file instead of rendering pages to pictures. Output is therefore as sharp as the original, text stays searchable and copyable, and the size is roughly the sum of the pages used. Thumbnails are drawn by Mozilla’s pdf.js in a background thread.

Rotation only changes the page’s orientation flag (/Rotate) and leaves the content untouched; deleting and reordering only change the page list. A PDF with an open password must be unlocked first, and even then its encrypted content cannot be copied as-is, so this tool re-creates those pages as images at about 144 dpi — text will not be selectable and the file may get larger.

Everything happens in your browser’s memory, so speed depends on your device: files of a few dozen pages usually take a second or two, while thousands of pages or several hundred MB may be slow or run out of memory on a phone — merge in batches or split first in that case. Bookmarks are not kept, and fillable forms are best completed before merging.

Features and limitations

This tool focuses on merging, splitting and organising pages. The table shows what it can and cannot do so you can tell whether it suits your files.

Feature Status Notes
Merge multiple PDFs Yes Reorder by drag or arrows, up to 100 files
Split / extract Yes Ranges, every N pages, single pages, or extract selected pages into one file
Rotate, delete, reorder pages Yes Thumbnail grid with multi-select batch actions
Lossless output Yes Page content is copied as-is, not re-rendered or recompressed
Images to PDF Yes JPG/PNG embedded without recompression; other formats become high-quality JPG; EXIF orientation is honoured
Encrypted / protected PDFs Partial Open password needed; output pages are images (about 144 dpi) without selectable text; passwords cannot be removed
Forms and annotations Partial Annotations and links stay with their pages; fillable form fields may stop working, so fill them in before merging
Bookmarks / outline No Bookmarks from the source files are not carried over
Compress PDF size No No image downsampling; a merged file is roughly the sum of its parts
Edit text / add signatures No Page content cannot be edited

FAQ

Are my PDFs uploaded to a server?

No. Files are read and generated inside your browser only; 17NAS servers never receive the files, their names or passwords. You can even go offline after the page and PDF components have loaded.

Does merging reduce quality? Can I still copy text?

No. Pages are copied as-is with no screenshots or recompression, so text remains searchable and copyable. The only exception is encrypted PDFs, which are output as images — the tool tells you when that happens.

How do I pull out just a few pages?

Either enter the pages in "Split" (e.g. 2, 5-7) and tick "Put these pages into one PDF", or tap the thumbnails you want in "Organise pages" and press "Extract selected". Both give you a new file containing only those pages.

Can I split every page into its own PDF?

Yes. Choose "Every page" in "Split" and each page becomes its own file (named like name-p3.pdf); press "Download all (ZIP)" to get them in one download.

My scanned pages are sideways or upside down — how do I rotate them?

Open "Organise pages" and use the rotate buttons on each thumbnail, or select several pages and use the toolbar rotate buttons, then press "Export PDF". Rotation is lossless — only the page orientation changes.

Can it handle password-protected PDFs?

Files that need an open password show a lock message; after entering the correct password you can continue, but those pages are output as images (text not selectable). Files that only restrict printing or editing are handled the same way. The tool cannot crack or remove passwords — without the password the file cannot be processed.

How do I turn phone photos into one PDF?

Drop the JPG/PNG photos in (they can be mixed with PDFs), set the order and merge — one image per page. "Image page settings" offers A4 or Letter pages and margins, and photos are turned upright using their EXIF orientation. iPhone HEIC photos need Safari, or convert them to JPG first with the image compressor.

Why is the merged file so large? Can it be compressed?

Because pages are copied losslessly, the result is roughly the sum of the input sizes (shared resources such as fonts are reused where possible). This tool does not downsample; if your document is mostly photos, shrink them first with the image compressor and then make the PDF.

Does it work on phones? What about large files?

Yes — recent browsers on iPhone and Android work; on phones, drag pages by the handle at the bottom right. Processing happens in device memory, so a few dozen pages are quick, while thousands of pages or several hundred MB may be slow or run out of memory on a phone — use a computer or work in batches.

Are bookmarks, forms and links kept?

Annotations and links on a page stay with that page; bookmarks (the outline) from the source files are not carried over; fillable form fields may stop being interactive, so fill in and save forms before merging or splitting.