PDF tools are one of those categories where the most heavily advertised options are often the worst value. They lead with "free" and hide the subscription wall, file size limits, or privacy compromises in the fine print. This is a guide to what's actually free and actually good.
What to Watch Out For
Before recommending anything, it's worth knowing the common tricks:
- Freemium bait-and-switch — the tool works for free up to a point, then demands a subscription. Often you don't find out until you try to download your converted file.
- Watermarks — the free version adds a watermark to your output. Useless for professional documents.
- File size limits — the free plan only accepts files under 5 MB, or only processes 1 file per day.
- Data harvesting — your uploaded files are stored and sometimes used for advertising purposes. This is particularly common with free-to-use sites that have no other revenue model.
- Fake "free" pricing — "free trial" that requires a credit card and auto-renews.
The Best Browser-Based PDF Tools (Genuinely Free)
PDF24x
Full disclosure: this is our tool. But it earns its place on this list. PDF24x processes everything in your browser — your files are never uploaded. It covers image to PDF conversion, PDF compression, merging, splitting, PDF to JPG, Excel to PDF, and a full suite of developer tools. No file size limits, no watermarks, no account required.
PDF24 (PDF24.com)
Not the same as PDF24x. PDF24.com is a long-established tool with a wide range of features. The free tier is generous. Files are uploaded to their servers for processing, so keep that in mind for sensitive documents. The desktop app is excellent and processes files locally.
Smallpdf
Polished interface, reliable results. The free plan limits you to two tasks per hour and uploads to their servers. For occasional use with non-sensitive files, it's fine. The paid plan is reasonable if you use PDF tools heavily.
iLovePDF
Similar to Smallpdf with a wide feature set. Uploads files to servers. Free tier has some limits but is workable for light use.
macOS Preview (Mac only)
Genuinely underestimated. Preview can merge PDFs, extract pages, reorder pages, annotate, fill forms, and add signatures — all for free, all locally, all without any upload. If you're on a Mac, Preview should be your first stop for anything it can do.
Windows Print to PDF
Every version of Windows from 10 onwards includes a built-in PDF printer. Open any document, press Print, and select "Microsoft Print to PDF." Not a full-featured tool, but for converting documents to PDF format it works perfectly and is completely private.
Best Tools for Specific Tasks
Converting images to PDF
PDF24x — browser-based, no upload, supports JPG/PNG/WEBP/BMP. Also handles multi-image PDFs and offers full page size and quality control.
Compressing PDFs
PDF24x Compress — three compression levels, browser-based. For heavily bloated files, Ghostscript on command line gives the most control.
Merging PDFs
PDF24x Merge or macOS Preview's sidebar drag-and-drop.
Splitting / extracting pages
PDF24x Split — supports page ranges, split-every-page, and custom split points. macOS Preview works well too.
Converting PDF to Word / DOCX
This is genuinely hard. Results vary significantly depending on the PDF's structure. For simple PDFs: iLovePDF does a reasonable job. For PDFs with complex layouts: Adobe Acrobat Pro gives the best results but costs money. Expect some formatting cleanup regardless.
OCR (making scanned PDFs searchable)
Adobe Acrobat has the best-quality OCR. For free alternatives, OCRmyPDF (open source, command line) is excellent. PDF24.com includes a free OCR tool.
Developer-Focused PDF Tools
If you're a developer working with PDFs programmatically:
- pdf-lib — JavaScript library for creating and modifying PDFs in Node.js or the browser. The library PDF24x itself uses.
- PDFMiner / pdfplumber — Python libraries for extracting text and tables from PDFs.
- Ghostscript — the gold standard for command-line PDF manipulation. Free, open source, powerful.
- Apache PDFBox — Java library for reading, writing, and manipulating PDFs.
Paid Tools Worth the Money
For professionals who work with PDFs daily, a paid tool is a worthwhile investment:
- Adobe Acrobat Pro — the most capable tool. OCR, form creation, redaction, electronic signatures, advanced compression. Expensive but justified for heavy users.
- PDF Expert (Mac/iOS) — excellent Apple ecosystem integration, much cheaper than Acrobat.
- Nitro PDF — Windows-focused alternative to Acrobat at a lower price.
Summary
For most people's PDF needs — converting images, compressing, merging, splitting — a combination of browser-based tools like PDF24x and built-in OS tools covers everything for free. Be cautious of sites that upload your files and hide subscription walls behind seemingly free interfaces.
Read more: How to compress a PDF without losing quality · How to merge and split PDFs