Merge PDF files
Drop in your PDFs, set the order, merge. Your documents are combined right in your browser – ideal for job applications, invoices or contracts that shouldn’t leave your device.
Source: Adobe – ISO 32000-1:2008 Document management – Portable document format (PDF 1.7). Updated: .
How it is calculated
Application documents, statements, scanned pages: often several PDFs need to be sent or uploaded as one file. This tool joins the pages of all files in the order you choose. Pages are copied unchanged – text stays text, it remains searchable, and images keep their quality.
How it works
- Drag PDFs (and JPG or PNG images if needed) into the box or choose them.
- Set the order by dragging or with the ↑ ↓ arrows – the top file comes first. Optionally pick pages per file and rotate.
- Click “Merge PDF” and download the result.
PDFs and images in one document
You can also place photos or scans as JPG or PNG between the PDFs, for example a scanned certificate. Each image becomes its own page, A4 and fitted by default. Page size and margin can be set as soon as an image is in the list. For lots of images without PDFs, use Images to PDF.
Pick pages, rotate, name the file
Each PDF in the list shows a small preview of its first page. Drag a file by that preview to where it belongs – on a phone, use the arrows. In the field under a multi-page PDF you enter which pages to take, for example “1-3, 5” or “8-” for page 8 to the end; empty means all pages. The ↻ button turns all pages of a file by 90° per click, and “File name of the result” sets what the download is called. The preview is drawn in your browser too (pdf.js); for files over 40 MB it is skipped, merging still works.
Typical uses
- Job applications: cover letter, CV and references as one PDF – many employers ask for exactly that.
- Taxes and bookkeeping: bundle a month’s receipts or all invoices for one case.
- Authorities and landlords: documents for a portal that only accepts a single file.
Limits
Password-protected PDFs can’t be merged – open them with the password first and save them without protection (e.g. via “Print to PDF”). Form fields, bookmarks and outlines of the individual files are not carried over; the visible page content is. Very large files need a matching amount of memory; a few hundred pages are no problem even on a phone.
Privacy
Many online PDF services upload your documents to their servers. Not here: the open-source library pdf-lib merges the files right in your browser. Your files never leave your device.
Related PDF tools: remove or extract pages with split PDF, turn photos and scans into a document with images to PDF, create a signature as a transparent PNG, and shrink large images first with the image compressor.
Frequently asked questions
Is merging really free and without a watermark?
Yes. No sign-up, no watermark, no limit of a few files per day.
Are my PDFs uploaded?
No. The files are processed in your browser and never leave your device – important for contracts, payslips or ID copies.
How do I change the order?
Drag a file by its preview to the right place, or use the ↑ and ↓ arrows next to each file. Files are merged from top to bottom.
Can I merge JPG images and PDFs?
Yes. JPG and PNG images are added as their own page, A4 by default. Convert other image formats first with “Images to PDF”.
Why can’t I add my PDF?
Usually it’s password-protected or damaged. Open it with the password and save it again via “Print to PDF” – then it works.
Is the quality preserved?
Yes. PDF pages are copied unchanged and nothing is recompressed. The file size is roughly the sum of the individual files.
How many files can I merge?
Up to 50 files of up to 200 MB each. In practice, your device’s memory sets the limit.
How do I merge PDFs on a Mac or iPhone?
Open this page in Safari, select the PDFs, set the order and merge – the file downloads straight away. On a Mac you can also use Preview and drag page thumbnails from one PDF into another.
Sources and legal basis
- Adobe – ISO 32000-1:2008 Document management – Portable document format (PDF 1.7)
- pdf-lib – Andrew Dillon (MIT)
- Open-source licenses of the libraries used (MIT, LGPL-3.0)
As of: · Editorial policy
Related tools
- Split PDF and extract pagesSplit a PDF, extract or delete pages: tap page thumbnails, split by ranges, every N pages or at bookmarks, with ZIP download. No upload, free, in your browser.
- Images to PDF: convert JPG, PNG and HEIC to PDFConvert JPG, PNG, WebP or HEIC to PDF and combine several images into one PDF – A4, Letter or image size, with margins. No upload, free, in your browser.
- Compress images – reduce file sizeCompress images without uploading: shrink JPG, PNG, WebP and HEIC, up to 20 at once, with an optional target size in KB and ZIP download. Free.
- QR Code Generator – free and permanentQR code generator for links, Wi-Fi, contacts (vCard), email, SMS or phone – add colors and a logo, download PNG or SVG. Never expires, no tracking, no sign-up.
- Barcode GeneratorBarcode generator for Code 128, Code 39, EAN-13, EAN-8, UPC-A and ITF-14: check digit added automatically, one code or a whole batch, download PNG or SVG.
- PDF to Markdown ConverterConvert PDF to Markdown: headings, paragraphs, lists and links as .md – for Obsidian, GitHub, notes or AI chats like ChatGPT and Claude. OCR for scans.
- Rotate and flip imagesRotate and flip images online: 90°, 180° or straighten freely, many photos at once, JPG even lossless via EXIF. Download as ZIP – nothing is uploaded.
- Blur or pixelate parts of an imageBlur an image online: mark faces, number plates or text with a box or brush and pixelate, blur or black them out. Free, in your browser – nothing is uploaded.
- Combine imagesCombine images: join 2 to 12 photos side by side, stacked or in a grid, without cropping, with spacing and background. In your browser, no upload, free.