Free PDF tools exist in huge numbers, but "free" often comes with caveats: file size limits, page number limits, daily usage caps, compulsory account creation, forced uploads to servers, or conversion to a paid tier after a few uses. This guide looks at which tools are genuinely free for the tasks most people actually need, with no nasty surprises.
PDFWhisk (browser-based, local processing)
PDFWhisk is built around a simple premise: common PDF tasks should work in any browser without uploading your files to a server. Compress, merge, split, rotate, delete pages, reorder pages, add page numbers, convert images to PDF, convert PDF to images, sign, watermark, protect, and unlock, all run locally using JavaScript and WebAssembly.
There are no daily limits, no file count restrictions on the core tools, and no account required. The Pro tier exists but is not required for basic use. For people who handle PDFs regularly and care about privacy, particularly for financial documents, contracts, or anything containing personal data, the local processing model removes a meaningful risk compared to upload-based tools.
Works on any device in any browser, including Safari and Chrome on iPhone and Android.
Adobe Acrobat Reader (free viewer, paid editor)
Adobe Acrobat Reader is the reference PDF viewer and is genuinely free for viewing, printing, and basic annotation. It handles password-protected PDFs, supports PDF/A and PDF/X formats, and renders complex documents more accurately than most alternatives. For simply reading and searching PDFs, it is excellent.
The caveat is that any editing, compression, conversion, or signing beyond the absolute basics requires upgrading to Acrobat Standard or Acrobat Pro, which cost roughly £15–20 per month on subscription. If you need to edit PDFs regularly, the cost is justifiable. For occasional use, there are better free alternatives for specific tasks.
macOS Preview (free, built into macOS)
Preview handles a surprising amount for a bundled application. You can view, annotate, sign (using your camera to capture a physical signature), merge PDFs by dragging pages in the thumbnail view, crop, and export in different formats. The compression quality is inconsistent, its Quartz filter can produce larger files than the input for some documents, but for quick annotation, basic merging, and adding handwritten-style signatures on a Mac, it is more than adequate.
Practical and free if you already have a Mac. Not available on Windows.
Smallpdf, ILovePDF, and similar online platforms
These are server-based tools with polished interfaces and a wide range of features. They work without installation and cover conversion, compression, editing, and more. The free tiers typically allow two or three tasks per hour or per day, and most require email registration beyond basic use. Files are uploaded to and processed on their servers, they state deletion policies, but you are trusting their infrastructure and practices.
For non-sensitive documents where the convenience outweighs the upload consideration, they are useful. For documents containing personal or financial data, a local-processing alternative is preferable. The free tier limits also make them less practical for regular or high-volume use.
LibreOffice (free, desktop)
LibreOffice is an open-source office suite that includes basic PDF handling. LibreOffice Writer can open PDFs (with variable quality depending on the document's complexity), and you can export any document to PDF from LibreOffice with compression settings. LibreOffice Draw can open PDFs and edit individual elements at a basic level.
For people who need to occasionally edit a PDF and do not need high fidelity, LibreOffice is free and runs offline. The trade-off is that it is a full desktop application suite, relatively heavy for occasional PDF use, and the editing quality for complex PDFs is inconsistent.
Microsoft Word 365 (PDF import, included if you have Office)
Word can open PDFs directly as editable documents. The quality of conversion depends on the PDF's complexity but has improved significantly in recent versions. If you already have Word as part of a Microsoft 365 subscription, this is free in the sense of having no additional cost. It is useful for simple to moderately complex PDFs. For highly formatted documents, post-conversion editing is still needed.
Google Docs (free, browser-based)
Google Docs can open PDFs directly from Google Drive by right-clicking and selecting Open with Google Docs. This runs OCR automatically if the file is scanned, making it one of the few free options for converting scanned documents to editable text. Layout fidelity is limited, complex formatting rarely survives, but for plain document text, it works well enough for free.
PDF24 (free, desktop)
PDF24 is a free Windows desktop application that covers compression, merging, splitting, conversion, and various other PDF tasks. It runs locally rather than uploading files, which is useful for privacy. The interface is functional without being particularly polished, but the range of features available entirely offline and entirely free is greater than most competitors. Worth knowing about as a desktop alternative to browser-based tools.
What is genuinely not available for free
High-quality PDF to Word conversion with layout preservation, full accessibility remediation, reliable OCR for complex documents, and certified digital signatures all require either a paid subscription or careful use of open-source alternatives that have a steeper setup curve. Adobe Acrobat Pro, at the expensive end, offers the best results for complex professional use. For most everyday PDF tasks, the free options above cover the practical requirements without a subscription.