Free PDF Converter
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Why convert files to PDF?

PDF is the universal document format for sharing, printing, and archiving. Whether you're sending a resume to an employer, submitting an assignment to a university portal, mailing a contract to a client, or uploading a report to a government website — PDF is almost always the required format. Here's why:

• Consistent appearance everywhere — PDFs look identical on Windows, Mac, Linux, iPhone, Android, and in every browser. Your formatting won't break when the recipient opens it.
• Locked content — PDFs are much harder to edit accidentally, making them the standard for contracts, invoices, and final deliverables.
• Universal compatibility — Not everyone owns Microsoft Office or Excel, but every device can open a PDF with free built-in readers.
• Smaller file sizes — Converted PDFs are often more compact than the original DOCX or PPTX, making them easier to email or upload.
• Professional presentation — Sending a resume, quote, or proposal as a PDF looks more polished than sending a raw editable file.

What makes PDFduck different from other PDF converters?

Most online PDF converters — Smallpdf, iLovePDF, PDF24, Adobe Acrobat online — cap free users at 2–3 conversions a day, push sign-ups, and keep your files on their servers indefinitely. PDFduck is built differently:

• No limits, no sign-up — Convert as many files as you want, no account, no email, no extensions.
• Images never upload — JPG and PNG conversions run entirely in your browser and never touch any server.
• Documents handled cleanly — Word, Excel, and PowerPoint are converted on our secure server with LibreOffice, then permanently deleted right after your download — never stored, logged, shared, or used for training.

You get the high-fidelity output of a professional conversion engine without the usual trade-offs: no daily caps, no account, and clear, minimal data handling.

PDFduck vs. Smallpdf vs. iLovePDF: honest comparison

Here's how PDFduck stacks up against the most popular free PDF converters:

PDFduck is built for people who just want to convert their files quickly, privately, and without dealing with paywalls or account creation. If you need advanced features like OCR, electronic signatures, or form filling, tools like Adobe Acrobat or Smallpdf Pro might suit you better. For everyday PDF conversion, PDFduck is the simpler, more private choice.

When should you use PDFduck?

PDFduck is ideal for these common scenarios:

• Job applications — Convert your CV or resume from Word to PDF before submitting. Employers and applicant tracking systems (ATS) prefer PDFs because they render consistently.
• University assignments — Most learning management systems (Moodle, Canvas, Blackboard) require PDF uploads. Convert your DOCX reports in seconds.
• Business documents — Invoices, quotes, proposals, and contracts look more professional and are harder to accidentally edit when sent as PDF.
• Photo to PDF — Combine multiple JPG or PNG images (receipts, IDs, scanned pages) into a PDF for emailing or archival.
• Presentations for review — Convert PowerPoint decks to PDF so reviewers can read them without needing PowerPoint installed.
• Financial records — Convert Excel spreadsheets to PDF for audit trails, year-end archiving, or sharing with accountants.
• Confidential documents — Medical records, legal papers, and anything you don't want to upload to a third-party server.

Which PDF converter do you need?

PDFduck offers dedicated pages for each file format with detailed guides and format-specific tips:

• Word to PDF — Convert DOCX documents while preserving fonts, tables, images, headings, and hyperlinks. Best for resumes, reports, contracts, and letters.
• JPG to PDF — Turn single images or multiple photos into a PDF document. Perfect for scanned receipts, ID photos, or photo collections.
• PNG to PDF — Convert transparent and lossless PNG images into a shareable PDF document. Great for screenshots, logos, and diagrams.
• Excel to PDF — Convert XLSX spreadsheets with all sheets, tables, and number formatting intact. Great for financial reports, data snapshots, and audit trails.
• PowerPoint to PDF — Turn PPTX presentations into shareable PDF slide decks. Ideal for sending decks to reviewers who don't have PowerPoint.

Each dedicated page includes format-specific FAQ, tips, and guidance to help you get the best conversion result for your file type.

How PDF conversion works at PDFduck

PDFduck uses the right tool for each file type, balancing privacy and fidelity:

• JPG and PNG images are read by your browser's built-in image decoders and written into a PDF entirely on your device — they never upload anywhere.
• Word (DOCX) documents are converted by LibreOffice on our server, preserving fonts, tables, images, and layout.
• Excel (XLSX) workbooks are rendered by LibreOffice Calc, keeping cell formatting, borders, and column structure intact.
• PowerPoint (PPTX) decks are rendered slide-by-slide by LibreOffice Impress, with images, charts, and exact layout preserved.

Documents are sent over an encrypted HTTPS connection, converted in seconds, and permanently deleted right after your download — never stored, logged, or used for training. Images don't leave your browser at all.

Tips for the best PDF conversion results

• Use standard fonts in your Word and PowerPoint files — Arial, Calibri, Times New Roman, and Georgia render most reliably. Exotic custom fonts may fall back to defaults.
• Keep image resolution reasonable — Very high-res images in DOCX or PPTX slow down conversion and produce huge PDFs. 150–300 DPI is usually enough.
• Accept track changes in Word before converting — unaccepted edits may appear strangely in the PDF output.
• Close spreadsheet formulas that have errors (#REF!, #N/A) before converting XLSX files. The PDF will show the error text otherwise.
• Flatten complex PPTX animations — PDFs are static, so any on-click animations or transitions obviously won't carry over. Your final slide state is what renders.
• Save DOCX, not DOC — PDFduck supports the modern DOCX format only. If you have an old .doc file, save it as .docx in Word or Google Docs first.
• Remove passwords first — Encrypted or password-protected files cannot be converted. Remove protection in the source app before uploading.