WeVividWeVividCombine several PDF files into one document in the order you choose. Free, no sign-up, and your files never leave your browser.
There is no fixed limit. Each file can be up to 50 MB, and very large totals depend on your device's memory.
No. Pages are copied across as they are, so layout, fonts and images stay the same.
Not directly. Unlock them first, then merge.
No. The PDF is processed entirely in your browser, so it never leaves your device.