Combine several PDFs into a single document, in the order you choose — nothing is uploaded.
Merging PDFs is one of the things people most often hand to a stranger's server: a contract and its annex, a scanned ID and its back, statements for a visa application, three invoices an accountant wants as one attachment. Those are exactly the documents you would rather not upload anywhere. This tool does the job inside your browser, and it reads each file first to show its page count — you see what you are about to produce.
The merge copies pages, not pixels. Every page is lifted from its source document together with the resources it depends on — embedded fonts, images, vector drawings — and written into a new file, so nothing is re-encoded and no quality is lost; the result weighs about as much as the originals added together. Page dimensions are kept per page, which means an A4 report followed by a Letter contract and a scanned photo produces one document whose pages simply have different sizes, exactly as they were. There is also an option for double-sided printing: it slips a blank page in after any file with an odd number of pages, so the next document starts on the front of a fresh sheet instead of on the back of the previous one.
Two honest limits. A PDF locked with a password is encrypted, and no tool can read its pages without the key — so a protected file is flagged by name and left out rather than quietly breaking the whole merge; open it in the app that created it, remove the password, and add it again. And this tool works with whole files: it does not split, rotate or delete individual pages, does not compress, and does not run OCR. Up to 30 files, 20 MB each and 150 MB in total, all read and written by JavaScript on your device — nothing is uploaded, stored or logged.
No. Every file is read and merged by JavaScript running on your own device: nothing is uploaded to Vai.la or to any other server, nothing is stored and nothing is logged. That is the whole point of this tool, because the documents people merge — contracts, statements, medical results, identity documents — are precisely the ones that should not be sitting on someone else's disk.
That PDF is encrypted, so its pages cannot be read without the password and no merging tool can get around that. Open the file in the app or reader that has the password, save or print it as an unprotected copy, and add that copy here. The other files in your list are unaffected and merge normally.
No. Pages are copied as they are, with their fonts and images intact — nothing is re-compressed or re-rendered, so text stays selectable and images stay exactly as sharp as they were. The merged file is roughly the size of the originals added up.
Yes. Each page keeps its own dimensions, so mixing A4, Letter and scanned pages works fine. Printers scale pages to the paper in the tray, so check the print preview if the mix matters.
Not here. This tool reorders and removes whole files, which covers most merges. Splitting a document, dropping one page or rotating pages are different jobs that need a PDF editor.
Double-sided printing. When a document has an odd number of pages, the next one would start on the back of its last sheet. Ticking the option inserts one blank page after each odd file, so every document begins on the front of a new sheet.
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Vai.la is not responsible for how the tools are used or for decisions made based on their results.