About UsePDFTools

What UsePDFTools offers

The site provides six core PDF tools, each targeting a common task that people encounter regularly with documents — whether at work, school, or at home:

• Compress PDF — reduces file size by removing redundant data and downsampling embedded images, making files easier to email or upload to portals with attachment limits.
• Merge PDF — combines two or more PDF documents into a single file, with drag-and-drop page reordering so you control the final sequence.
• Split PDF — extracts individual pages or page ranges from a larger document, useful for sharing a chapter without sending an entire report.
• Rotate PDF — permanently corrects page orientation (90°, 180°, or 270°) and saves the result, so viewers never have to tilt their screens again.
• PDF to Image — rasterises each page to a high-quality JPG or PNG file, which you can download individually or as a ZIP archive.
• PDF to Word — extracts the text content from a PDF and writes it into a .docx file that you can open and edit in Microsoft Word, LibreOffice, or Google Docs.

All tools are free to use with no account, no watermarks, and no enforced file-size cap. You can process as many files as your browser can handle.

The technology behind the tools

UsePDFTools is a static website — plain HTML, CSS, and JavaScript with no backend server doing any document work. The heavy lifting is handled entirely by two well-established open-source libraries that run directly in the browser.

pdf-lib (version 1.17.1)

pdf-lib is a pure-JavaScript library for creating and modifying PDF files. It works by parsing the low-level PDF byte stream into a traversable object model, allowing code to read or write individual objects — pages, content streams, fonts, images, and metadata — and then serialise the result back into a valid PDF binary. UsePDFTools uses pdf-lib for all operations that produce a modified PDF: compressing (stripping unused objects and recompressing image streams), merging (copying page trees from multiple documents into one), splitting (copying a subset of pages into a new document), and rotating (updating the /Rotate entry in each page dictionary). Because pdf-lib runs synchronously in the browser's JavaScript engine, it accesses only the ArrayBuffers you hand it — there is no network call involved in its execution.

PDF.js (version 3.11.174)

PDF.js is Mozilla's open-source PDF renderer for the web, the same engine that powers the built-in PDF viewer in Firefox. It parses a PDF document, decodes its content streams, and produces pixel-accurate renders of each page using an HTML Canvas element. UsePDFTools uses PDF.js for any operation that needs to "see" what is on a page: the PDF to Image tool renders each page to a canvas at the requested resolution and then exports it as a PNG or JPEG data URL, and the PDF to Word tool uses PDF.js's text-extraction layer to read the Unicode text items embedded in the document's content streams.

Supporting libraries

Two smaller libraries round out the stack. JSZip (3.10.1) is used to bundle multiple image files into a single downloadable .zip archive when you convert a multi-page PDF to images. The docx library (8.5.0) takes the paragraphs extracted by PDF.js and serialises them into the Open XML format that Word and compatible applications expect — handling things like paragraph spacing, font declarations, and the required ZIP-based .docx container. FileSaver.js (2.0.5) provides a consistent cross-browser API for triggering file downloads without needing a server redirect.

Why client-side processing was chosen

Running everything in the browser was a deliberate architectural decision, not a technical shortcut. Server-based PDF tools require you to upload your file, wait for a remote process to complete, download the result, and trust that the service deletes your data afterwards. That model introduces latency, bandwidth requirements, and a privacy dependency on a third party. With a purely client-side architecture, none of those concerns apply: processing speed is limited only by your own CPU, there is no upload wait time for large files, and the privacy guarantee is structural rather than policy-based — there is simply no pathway for your data to reach an external server.

How each tool works under the hood

Compress PDF

When you load a PDF into the compressor, pdf-lib parses the document and iterates over its embedded image XObjects. Each image stream is decoded, and if it is stored in a lossless format (such as PNG or uncompressed bitmap), it is re-encoded at a lower JPEG quality level using the browser's built-in Canvas API. The re-encoded bytes replace the original stream, and pdf-lib re-serialises the document. Unused object references and duplicate content streams are also removed during serialisation. The result is a smaller file that preserves all text, vector graphics, and document structure.

Merge PDF

Merging works by loading each source document with pdf-lib and then copying every page from the secondary documents into the first document's page tree. pdf-lib handles the internal cross-reference table (the xref) automatically, ensuring that resources such as fonts and form XObjects referenced by the copied pages are also copied and that their object numbers do not collide with those already present in the target document.

Split PDF

The split tool creates a new, empty PDF with pdf-lib and then copies the requested pages from the source document into it using the same page-copying mechanism as the merge tool. Pages that are not part of the selection are simply not copied, and the resulting document contains only the requested subset.

Rotate PDF

PDF page rotation is stored in the page dictionary as a /Rotate integer value (0, 90, 180, or 270). The rotate tool uses pdf-lib to traverse each page's dictionary and update this value. Because the rotation is baked into the file rather than applied as a viewer preference, the corrected orientation is visible in every PDF reader, including those that do not honour viewer preferences.

PDF to Image

Each page is rendered at the chosen resolution by PDF.js onto an off-screen HTML Canvas element. PDF.js decodes all content streams — text, vector paths, and raster images — and composites them onto the canvas exactly as a PDF viewer would display them. The canvas is then exported to a Blob using its toBlob API in either JPEG or PNG format. For multi-page documents, all page Blobs are collected and handed to JSZip, which assembles them into a single .zip file that triggers a single download.

PDF to Word

PDF.js exposes a text-content layer alongside its rendering layer. For each page, this layer returns an array of text items, each with a Unicode string, a position, and transform data. The tool collects these items, groups them into logical lines based on their vertical position, and then passes the resulting paragraphs to the docx library. docx serialises the paragraphs into Open XML paragraph elements inside a .docx package. The output is a plain, editable Word document containing the extracted text in reading order.

Privacy architecture

The privacy protection offered by UsePDFTools is not a matter of policy — it is a consequence of how the site is built. The web server that delivers the HTML, CSS, and JavaScript files has no capability to receive file uploads, because no upload endpoint exists. Once the JavaScript has loaded in your browser, it operates entirely within the browser's sandboxed JavaScript environment. The files you select via the file picker are read into the browser's memory as ArrayBuffers or Blobs; they never enter the network stack.

This architecture also means that processing works offline once the page has loaded. If you open UsePDFTools, load the page fully, and then disconnect from the internet, the tools continue to function — because there is no server call to make.

The only external network requests the page makes are to load the Bootstrap CSS and JS bundles from a CDN on first visit, and to load advertisements. These requests do not involve your documents in any way. You can verify this by opening your browser's Network panel (DevTools) while using any tool: you will see no outbound POST or PUT requests containing file data.

Why UsePDFTools is free

Running a static website has real costs — domain registration, hosting, and the ongoing work of maintaining and improving the tools. UsePDFTools covers these costs through contextual advertising served by Google AdSense. The ads are unobtrusive and do not affect tool functionality. There is no premium tier, no subscription, and no feature that is locked behind payment. Every tool is fully available to every visitor.

Keeping the service free and ad-supported also means there is no incentive to collect, retain, or monetise user data — the business model does not depend on knowing anything about you personally. You can read the full details of what data the site and its ad partner collect in the Privacy Policy.

Honest limitations

UsePDFTools is built on top of what modern browsers can do with PDF files, and there are genuine limitations worth knowing about before you rely on a tool for a specific task.

• No OCR (optical character recognition). If your PDF consists of scanned page images — common with documents that were physically photocopied and then scanned — there is no machine-readable text embedded in the file. PDF.js can render those pages as images, but it cannot read text from a photograph of a page. The PDF to Word tool will produce an empty or near-empty document for scanned PDFs.
• No image-to-PDF conversion. The site does not currently offer a tool to create a PDF from one or more image files (JPG, PNG, etc.).
• No password removal. PDF files that are protected with an owner or user password cannot be opened by pdf-lib or PDF.js without the correct password. If you do not have the password for a document, the tools will not be able to process it.
• No form filling or digital signatures. PDF forms and cryptographic signature fields are not supported by the current toolset.
• Complex layout in Word export. The PDF to Word converter extracts text in reading order, but PDFs do not store layout intent the way Word documents do. Multi-column layouts, tables, headers and footers, and decorative text may not reconstruct cleanly in the .docx output. The tool is best suited to single-column text documents such as reports, articles, and correspondence.
• Very large files may be slow. Because processing happens on your local CPU with no server-side parallelism, extremely large PDFs (hundreds of pages, or files containing very high-resolution images) may take longer to process than a server-based tool would. Performance depends on your device's hardware.

These are not bugs — they reflect the genuine boundaries of client-side PDF processing with current web technology. If your use case requires OCR or advanced form handling, a dedicated desktop application or a specialised online service may be a better fit.

Get in touch

If you have a question about how a tool works, have found a bug, or have a suggestion for a feature or a new tool, we would be glad to hear from you. The best way to reach us is through the Contact page, or you can email directly at anaszafar1676@gmail.com. We read every message, even if replies sometimes take a few days.