How Do the PDF Tools Work?
The three tools on this page (Merge, Split/Extract, Delete Pages) use the open-source pdf-lib library to rearrange the page structure of your PDF files. When you select a file (or drop it in), the PDF is read into your browser's memory as a byte array; the tool parses those bytes with pdf-lib, copies the pages you want into a new PDF document, and then downloads the resulting file straight to your device. At no point in this process is your file sent to any server over a network request — there's no "upload" step at all.
When to use it: combining several scanned documents (e.g. the attachments for a job application) into a single PDF, extracting just the relevant section of a long report (say, pages 12–18) as a separate file, removing unnecessary or blank pages from a contract or presentation, or sharing every page of a document individually (using the "download one by one" option). Since the up/down arrows in the Merge tab let you reorder files, you don't need to add attachments in the exact right order the first time — you can always rearrange them afterward.
The limits of these tools: they only operate at the page level — merging, selecting/extracting pages, and deleting pages. Editing the text inside a PDF, changing fonts, or converting a scanned document into searchable text (OCR) are outside the scope of this tool; those require a dedicated PDF editor or OCR software. PDFs that require a user password to open also can't be processed — the password needs to be removed first. When entering a page range, use a comma-separated format like "1-3, 5, 8-10"; if you enter an invalid range, the tool clearly states which page or format is the problem.
This makes a real difference for sensitive documents: unlike many online PDF tools that upload your file to a cloud server for processing, when you work with a contract, invoice, ID copy or résumé here, your file never leaves your device. Close the tab, and the file is cleared from memory too.
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Frequently Asked Questions
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