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About Merge PDF

PDF BOX's Merge PDF tool is one of the most essential utilities for anyone who regularly works with PDF documents. Whether you're a student compiling research chapters, a professional assembling multi-section reports, or an office worker combining scanned invoices, this tool makes the entire process effortless and instant.

The tool uses pdf-lib — a powerful open-source JavaScript library — to load each PDF you provide, copy all its pages verbatim into a brand-new document, and stitch them together into a single, cohesive output file. Every element from each source PDF is preserved with complete fidelity: embedded fonts, raster images, vector graphics, hyperlinks, bookmarks, and all page formatting. The output PDF is 100% standards-compliant and opens perfectly in Adobe Acrobat, Chrome, Firefox, Preview, or any other PDF reader on any platform.

How to use: Click the upload area or drag and drop your PDF files directly onto the dropzone. Add as many PDFs as you need — there is no hard limit beyond your device's available memory. Review the file list below the dropzone; click the ✕ button beside any file to remove it. The merge order follows the order in the list, so arrange files as desired. Enter a custom output filename (or keep the default "merged") and click the Merge PDFs button. The progress bar will track the operation page-by-page. Once complete, a download button appears — click it to save your merged document.

Key advantages: All processing happens locally in your browser — your files are never uploaded to any server, ensuring complete privacy. There are no file size limits imposed by the tool (only your device's RAM applies), no watermarks added to the output, and no quality loss whatsoever. Different page sizes and orientations coexist perfectly in the same merged document, making it ideal for combining A4 and Letter-sized pages without reformatting.

Common use cases: Combining monthly bank statements into a yearly archive, assembling thesis chapters, merging scanned document batches, consolidating presentation handouts, or creating complete portfolios from individual project files. PDF BOX Merge PDF is free, unlimited, and fully private — your documents are always yours.

About Split PDF

The Split PDF tool gives you surgical precision over your PDF documents, letting you extract any subset of pages into a brand-new file within seconds. Whether you need to isolate a single chapter from a book, separate a contract from an appendix, or extract slides from a presentation, this tool handles it effortlessly — all without any software installation.

Under the hood, the tool uses pdf-lib to load your document, parse your requested page range, copy only the specified pages into a fresh PDF document, and save it as a clean, self-contained file. All embedded content — images, fonts, annotations, and links — on those pages is preserved exactly as it appeared in the original.

How to use: Upload your PDF by clicking the dropzone or dragging a file onto it. The tool will automatically detect and display the total page count. Enter your desired page range in the text box using standard notation: use hyphens for ranges (1-5 means pages 1 through 5), commas for individual pages (1,3,7), or combine them (1-3,5,8-10). Click Split PDF and download your extracted document.

Page range syntax: You can combine any ranges and individual pages in one expression. For example, "2-4,6,9-11" extracts pages 2, 3, 4, 6, 9, 10, and 11. Pages are always output in the order specified, so you can also use this tool to reorder pages by listing them in a custom sequence (e.g., "5,3,1,2,4").

Key advantages: No quality loss — pages are copied byte-for-byte. No page count limit — works on PDFs with thousands of pages. Completely private — nothing is uploaded anywhere. Instant processing on modern devices. No watermarks or branding in the output file.

Common use cases: Extracting a single invoice from a batch statement, separating chapters from an e-book, pulling specific slides from a PDF presentation, removing the first or last few pages from a report, or archiving only the relevant section of a legal document.

About Compress PDF

Large PDF files can be a headache — they fill up storage, clog email inboxes, and take forever to upload. The PDF BOX Compress PDF tool intelligently reduces your PDF file size without requiring you to sacrifice the quality of your document's content. Everything happens in-browser in seconds, with zero file uploads and complete privacy.

The compression works by re-serializing the PDF through pdf-lib's optimized save routine, which uses object stream compression (cross-reference stream compression) to pack the PDF's internal structure more efficiently. The High compression mode additionally strips unnecessary metadata like author information, creation history, and redundant producer tags — a common source of "hidden bloat" in PDFs generated by Microsoft Office, LibreOffice, or print-to-PDF drivers.

How to use: Upload your PDF, select your preferred compression level (Low preserves maximum visual quality, Medium is the best all-around choice, High produces the smallest file at the cost of some metadata), then click Compress PDF. The result shows both the new file size and how many bytes were saved, expressed as a percentage.

Compression levels explained: Low re-encodes the file structure only, keeping all metadata intact — ideal for archival copies. Medium applies structural optimization and minor metadata cleanup. High strips all non-essential metadata and applies maximum object stream compression — best for sharing via email or messaging apps with attachment limits.

Important note: PDF BOX uses pure JavaScript compression, which is highly effective for text-heavy PDFs, documents with redundant metadata, and files created by verbose PDF generators. For PDFs that are already well-optimized or consist primarily of high-resolution scanned images, the size reduction may be modest (typically 5–15%). For typical office documents, savings of 20–60% are common.

Common use cases: Reducing PDF size for email attachments, compressing reports for cloud storage, optimizing scanned documents for archiving, or making large presentations easier to share on messaging platforms.

About Rotate PDF

A scanned document in the wrong orientation, a phone-photographed receipt turned sideways, or a report whose pages alternate between portrait and landscape — these are everyday problems that the PDF BOX Rotate PDF tool solves instantly. Correct the orientation of any page or every page in your PDF with a single click, directly in your browser.

The tool uses pdf-lib's built-in page rotation API, which applies the rotation by modifying each page's internal rotation value in the PDF structure. This is a lossless operation — no re-rendering, no quality loss, and no changes to the actual content on the page. The rotation is baked into the PDF metadata, so every reader — Adobe Acrobat, Chrome, mobile PDF viewers — will display the page in the corrected orientation.

How to use: Upload your PDF, choose your rotation angle (90°, 180°, or 270° clockwise), then choose whether to rotate all pages or only specific ones. If you select "Specific pages," enter the page numbers or ranges in the text box (e.g., "1,3,5-7"). Click Rotate PDF and download your corrected document.

Rotation angles: 90° rotates each selected page a quarter turn clockwise — ideal for fixing landscape pages in a portrait document. 180° flips the page upside down, useful when a document was scanned in reverse. 270° rotates counter-clockwise (equivalent to 90° counter-clockwise), handy for pages scanned from the wrong side.

Selective rotation: The selective page mode is particularly powerful. You can enter any combination of individual pages and ranges — for example, "2,4,6-10,15" — to rotate only those specific pages while leaving the rest untouched. The rotation is additive, meaning if a page was already rotated 90°, applying another 90° results in 180° total.

Common use cases: Fixing scanned documents, correcting mobile phone photos of documents converted to PDF, adjusting mixed-orientation PDFs, rotating individual pages before merging, or correcting PDFs received from other people in the wrong orientation.

About PDF to Images

The PDF to Images converter renders every page of your PDF document into a high-quality PNG image file. This is incredibly useful for embedding PDF content in presentations, websites, documents, or any platform that accepts images but not PDFs. Each page becomes its own independently downloadable PNG file — sharp, transparent-background-free, and ready to use.

The conversion is powered by PDF.js, Mozilla's powerful open-source PDF rendering engine (the same engine that powers Firefox's built-in PDF viewer). PDF.js renders each page to an HTML canvas at your chosen DPI, then exports that canvas as a lossless PNG file. The rendering faithfully reproduces all visual elements: text, images, charts, diagrams, vector graphics, and color information — exactly as they appear in the original PDF.

How to use: Upload your PDF, select your preferred DPI (resolution), and click Convert to Images. The progress bar tracks the rendering of each page. Once complete, a visual grid of all pages appears — click any thumbnail to download that page as a PNG image. All pages are rendered in sequence and available individually.

Choosing the right DPI: 72 DPI is suitable for web display and produces the smallest file sizes. 150 DPI is the recommended default — it produces crisp, readable images ideal for most use cases including presentations and document sharing. 300 DPI produces print-quality images where every detail is razor-sharp — ideal for archiving, professional printing, or when the PDF contains fine details like engineering diagrams or medical charts.

Key advantages: Lossless PNG format preserves all color and detail. No server uploads — everything renders in your browser. Each page is individually downloadable. Supports PDFs of any size with any number of pages. Handles complex PDFs with fonts, gradients, shadows, and transparency correctly.

Common use cases: Extracting cover art from PDF brochures, creating web-optimized images from PDF reports, capturing specific pages for use in presentations, converting scanned PDF pages for OCR processing, or archiving PDF content as image files.

About Images to PDF

The Images to PDF tool turns any collection of JPG, PNG, or WebP images into a single, professional-quality PDF document. Whether you have scanned pages, photo scans of handwritten notes, downloaded images from a website, or a series of screenshots, this tool bundles them all into one portable, universally readable PDF — right in your browser, with no server involved.

Each image becomes one page in the output PDF. The tool embeds images using pdf-lib's image embedding API: PNG files are embedded with full lossless quality, JPEG files are embedded directly from their original bytes (no re-compression), and WebP files are converted to JPEG via the browser's Canvas API before embedding. Images are automatically scaled to fit your chosen page size while maintaining their original aspect ratio and centering them on the page.

How to use: Click the dropzone or drag your image files onto it. You can select multiple files at once — add them in the order you want them to appear in the PDF. Use the ✕ button to remove any unwanted image. Choose your page size (A4, Letter, or Fit to image), enter an output filename, and click Convert to PDF. The progress bar tracks each image as it is embedded. Download your complete PDF when processing finishes.

Page size options: A4 and Letter options scale your images to fit standard paper sizes — ideal for printing or professional use. "Fit to image" sets each page's dimensions exactly to the image's pixel dimensions (useful for preserving exact image content at 1:1 scale).

Key advantages: Supports mixing different image formats in the same PDF. No quality loss for PNG or JPEG inputs. No file count limit. Completely private — no uploads. Automatic centering and scaling maintains aspect ratios perfectly. Supports images of any resolution and dimension.

Common use cases: Compiling scanned document pages into a single PDF, creating photo albums, assembling screenshot reports, converting a series of exported chart images into a presentation PDF, or packaging artwork files for submission.

About Add Watermark

The Add Watermark tool lets you brand, label, or protect your PDF documents by overlaying a semi-transparent diagonal text stamp across every page. Watermarks are used by businesses, publishers, and individuals to assert ownership, mark document status (DRAFT, CONFIDENTIAL, COPY), or discourage unauthorized redistribution — all without affecting the readable content beneath.

The watermark is rendered using pdf-lib's text drawing API with the Helvetica Bold font, positioned diagonally at 45° across the center of each page. The text is rendered at a configurable opacity (transparency level), so it's clearly visible as a watermark without obscuring the underlying content. The color is fully customizable using any hex color you choose with the built-in color picker.

How to use: Upload your PDF, type your watermark text (default: CONFIDENTIAL), adjust the font size slider (20–100 pt), set the opacity (5–80%, where lower is more transparent), pick your color, and click Add Watermark. The tool processes every page simultaneously, then produces a watermarked PDF ready for download.

Customization options: Text can be anything — company names, "DRAFT," "DO NOT COPY," copyright notices, or custom identifiers. Font size controls how large the watermark text appears on each page. Opacity lets you balance visibility with readability of the underlying content: 10–20% creates a subtle ghost watermark, while 40–60% creates a bold, visible stamp. Color choice lets you match your brand or create contrast against the page background.

Key advantages: Applied to every page automatically with no page limit. Completely non-destructive to the underlying document — the original content is preserved. Output is a standard PDF compatible with all readers. No server uploads — your documents stay on your device. No visible "PDF BOX" branding or secondary watermarks are added.

Common use cases: Marking draft documents before distribution, branding PDFs with company names, adding copyright notices to published materials, marking personal copies of contracts, or labeling documents as "SAMPLE" or "PROOF" during review processes.

About Protect PDF

The Protect PDF tool secures your sensitive documents with password-based encryption, ensuring that only authorized recipients can open and view the file. When a protected PDF is opened in any standard PDF reader — Adobe Acrobat, Chrome, Edge, Preview on macOS, or any mobile PDF viewer — the reader will immediately prompt for the password before displaying any content.

PDF BOX implements real PDF encryption using a combination of RC4 and MD5 cryptographic operations as specified in the PDF Standard Security Handler specification. When pdf-lib-with-encrypt is available, AES-128 encryption is applied — the industry standard for PDF document security. The encryption key is derived from your password using multiple MD5 hash iterations, making brute-force attacks computationally expensive. A randomly generated owner password is also applied, preventing unauthorized editing or permission changes even if someone attempts to bypass the user password.

How to use: Upload your PDF, enter your chosen password in the "User Password" field, confirm it in the second field, and click Protect PDF. Use the eye icon to toggle password visibility. Your password must be at least 4 characters — use a longer, more complex password for better security. Download the protected PDF when processing completes.

Security permissions applied: The protected PDF allows opening and reading when the correct password is entered, but restricts copying of text, modifying the document structure, adding annotations, or assembling pages. High-resolution printing is permitted (for legitimate use), but document assembly and content extraction are locked.

Important security note: The password is never transmitted to any server — all encryption happens locally in your browser using the Web Crypto API and JavaScript cryptographic libraries. Choose a strong password (8+ characters, mixed case, numbers) for sensitive documents. Store your password securely — there is no recovery mechanism if you forget it.

Common use cases: Securing legal contracts before sending by email, protecting financial statements, locking exam papers or confidential reports, controlling access to copyrighted materials, or preventing unauthorized modification of official documents.

About Extract Pages

The Extract Pages tool lets you cherry-pick any combination of individual pages or page ranges from a PDF and bundle them into a brand-new PDF document. While the Split PDF tool is designed for extracting a contiguous block of pages, Extract Pages handles non-contiguous selections — perfect for pulling scattered pages from a large document without affecting the original file.

The extraction is lossless and precise: each selected page is copied byte-for-byte using pdf-lib's page copy API, preserving all embedded fonts, images, vector artwork, annotations, hyperlinks, and formatting. The original PDF remains completely unchanged — the tool only reads from it and creates a new document from the requested pages.

How to use: Upload your PDF — the tool will show you the total number of pages so you know the valid range. Enter your page selection using the same intuitive notation: individual pages separated by commas (1,3,7), ranges connected by hyphens (5-10), or any combination (1,3,5-7,12,15-18). Click Extract Pages and download your new PDF.

Advanced selection: You can list pages in any order, and the output will contain them in the order you specified. This means Extract Pages doubles as a page reordering tool — listing "5,1,3,2,4" produces a PDF with those pages in exactly that sequence. Duplicate page numbers in the selection are automatically de-duplicated.

Key advantages: Handles PDFs of any size. No quality loss — pages are copied, not re-rendered. Non-contiguous page selection lets you extract any arbitrary combination of pages. Completely private — no server uploads. Output is a clean, standalone PDF.

Common use cases: Extracting appendices from a report, pulling selected slides from a presentation PDF, saving specific invoices from a multi-page statement, collecting only the signature pages from a contract package, or reordering chapters in a book before sharing.

About PDF to Word

The PDF to Word converter is one of the most sought-after document tools available, and PDF BOX delivers it completely free, in-browser, and with robust support for all languages — including Arabic, Hebrew, Persian, and other right-to-left scripts. The output is a real .docx file that opens natively in Microsoft Word, LibreOffice Writer, Google Docs, and any other word processor that supports the modern Office Open XML format.

The conversion engine uses two powerful technologies working in tandem. First, PDF.js extracts the text content from every page of your PDF, retrieving each text item's content, position, font size, and coordinates. Second, docx.js constructs a properly structured Word document with correctly formatted paragraphs, appropriate font sizes, and — critically — accurate text direction for every line of text.

Arabic and RTL language support: The tool automatically detects Arabic, Hebrew, Persian, Urdu, and other right-to-left languages by checking for characters in the Unicode RTL code ranges. When RTL text is detected, the paragraph is set to bidirectional mode with right-alignment and the appropriate RTL text direction flag. This ensures Arabic text flows correctly from right to left in the Word document, just as it did in the original PDF.

Word spacing accuracy: PDF files store text as individual positioned glyphs rather than simple strings with spaces. The tool analyses the X-coordinate gaps between consecutive text items on each line and inserts word spaces wherever the gap exceeds a calculated threshold based on the font size. This recovers accurate word spacing from the raw glyph data, producing natural, readable text in the output document.

How to use: Upload your PDF, click Convert to Word, and wait for the conversion to complete (larger PDFs may take 10–30 seconds). Download the .docx file and open it in your word processor. The document is organized page-by-page, with page breaks between each original PDF page and font sizes that match the original as closely as possible.

Common use cases: Editing contract text that was received as a PDF, extracting and reformatting academic papers, converting Arabic or multilingual PDFs into editable documents, recovering text from old PDF reports for reuse, or making a scanned PDF's text accessible for editing.

About Word to PDF

The Word to PDF converter transforms your Microsoft Word .docx documents into universally compatible PDF files — directly in your browser, with no Microsoft Office installation required and no file uploads to any server. The output PDF preserves the visual appearance of your document: text content, paragraph structure, tables, embedded images, headings, lists, bold and italic formatting, and blockquotes are all faithfully reproduced.

The conversion pipeline uses two best-in-class open source libraries. Mammoth.js reads your .docx file and converts it into clean, structured HTML — a format that captures all the semantic and visual information in the Word document, including embedded images encoded as base64 data URIs. The HTML is then rendered by html2canvas (the same engine used in popular screenshot tools) into a high-resolution canvas at 2× pixel density for sharp output. Finally, pdf-lib packages the rendered canvas into a properly structured A4 PDF document with automatic page splitting.

Image preservation: Embedded images in your Word document — photos, charts, diagrams, logos, and illustrations — are extracted by mammoth.js as base64-encoded image data and rendered into the HTML canvas. This means your images appear in the PDF at their full resolution, positioned as they were in the original Word document.

How to use: Click the dropzone or drag your .docx file onto it. Click Convert to PDF. Conversion time depends on document length and image content — simple text documents convert in seconds, while image-heavy documents may take 15–30 seconds. Once complete, download your PDF. The output is A4 sized and rendered at print quality (2× DPI scaling for clarity).

Supported formatting: Headings (H1–H3), paragraphs, bold, italic, tables with borders, bulleted and numbered lists, blockquotes, and inline images. Complex Word features like tracked changes, comments, macros, and custom fonts are gracefully handled through mammoth.js's intelligent conversion rules.

Common use cases: Sharing a Word document as a non-editable PDF, submitting assignments in PDF format, creating PDF versions of reports or proposals, archiving Word documents as PDFs for long-term storage, or converting documents for printing without Microsoft Word.