PDFFly

What is PDFFly?

PDFFly is a free browser-based document toolkit that converts files to and from PDF, compresses and edits them, and adds AI summaries, chat and translation. It lists more than 50 conversion routes, covering Office files, images, ebooks and CAD drawings such as DWG and DXF.

You upload a file of up to 100 MB, choose a tool and download the result, usually without creating an account. PDFFly Limited, based in Limassol, Cyprus, runs the service and says it launched in 2025. Its home page reports more than 6 million users and around 17 million conversions, figures we could not check independently.

The terms state that the service is free, with no paid plans, trials or one-off purchases. AI features send document content to the OpenAI API, and the company says that material is not used to train models.

Key Features

PDFFly’s wide conversion list and free AI summariser are its most useful features, since few free PDF sites combine both without a paywall.

• Format conversion: PDFs convert to and from more than 50 formats, including Word, Excel, PowerPoint, EPUB, MOBI, AZW3, HEIC, AVIF and DjVu. CAD users can also turn DWG and DXF drawings into PDF without installing design software.
• Target compression: Files can be compressed to fit fixed limits of 10, 5, 2 or 1 MB. This helps when an email system, job portal or government form caps attachment size and you need a predictable result.
• OCR in 195 languages: The OCR tool turns scanned PDFs into searchable, editable documents and claims recognition for 195 languages. It works best on clear, typed pages, and the site warns that handwriting may not be read accurately.
• AI summariser and chat: The PDF Summarizer condenses long documents into short summaries and adds a chat for questions about the content. It can work section by section, which helps with textbooks, and Futurepedia reports that summaries export as PDF.
• Layout-preserving translation: Whole PDFs can be translated into languages such as Spanish, Chinese, German, Arabic, French and Hindi. PDFFly says tables, images, fonts and colours keep their original layout, though it does not state how many languages are covered.
• Editor and page tools: The online editor adds text, signatures, highlights, sticky notes and form entries to a PDF. Separate tools merge, split and rotate files, remove passwords and delete pages, all within the same 100 MB file limit.

Pros

The main reason to choose PDFFly is cost, because every tool, AI summaries included, is free with no premium tier.

• No cost: Every tool is free, and the terms rule out subscriptions, trials and one-off purchases. Students and small businesses get AI summaries and OCR that rival sites often keep behind a paid plan.
• No account needed: Most tasks work without registering, so you can upload, convert and download in one visit. This suits occasional users who do not want another login or marketing emails.
• Wide format list: Niche formats such as AZW3, CBR, DjVu, DWG and DXF are covered alongside the usual Office and image types. Ebook readers and engineers can avoid installing a separate converter for each format.
• Generous file limit: Uploads of up to 100 MB are accepted on every tool. Large scanned reports and image-heavy brochures can usually be processed in one go without splitting them first.
• Short file retention: Files not saved to an account are deleted within two hours, and unfinished uploads within 24 hours. Uploads travel over SSL, which limits how long your documents sit on the server.

Cons

The biggest drawback is that the AI tools send document content to OpenAI, which rules PDFFly out for confidential files in many organisations.

• Third-party AI: Summaries, chat and translation pass document text to the OpenAI API. PDFFly says the data is not used for training, but legal or medical teams may still be barred from uploading client files.
• Basic editing: The editor focuses on adding text, annotations, signatures and form entries rather than full layout changes. Image insertion and shapes are not listed, so heavier redesigns still need a desktop editor.
• Young company: PDFFly says it launched in 2025, and independent user reviews are still scarce. Its usage figures come from the company itself, so long-term reliability is harder to judge.
• Online only: There is no desktop, offline or dedicated mobile app on the official site. Every task needs a stable connection, which is awkward when travelling or uploading large files on slow networks.
• No integrations: No public API, cloud storage links or browser extension are listed. Teams that want to automate conversions or pull files from Google Drive or Dropbox will need another service.

Who is Using PDFFly?

PDFFly is used mostly by students and office staff who need quick, free conversions, with smaller groups of freelancers, ebook readers and engineers.

• Students and researchers: Learners condense research papers, textbook chapters and lecture notes with the summariser. The chat helps them check specific points before an essay or exam.
• Office workers: Staff switch files between PDF, Word, Excel and PowerPoint for reports and invoices. Target compression helps them meet email attachment limits.
• Freelancers and small firms: Independent workers sign, merge and compress client documents without paying for software. The no-account flow keeps occasional jobs quick.
• Ebook readers and engineers: Readers move books between EPUB, MOBI, AZW3 and PDF for different devices. Engineers convert DWG and DXF drawings into PDFs that clients can open.

Pricing

PDFFly is free to use, and its terms rule out subscriptions, trials and one-off purchases (official terms, October 2026).

Futurepedia lists an unpriced Premium tier, which the official terms contradict.

Disclaimer: Free services can add charges later, so recheck the terms now and then.

What Makes PDFFly Unique?

PDFFly keeps every tool free, AI chat and translation included, where most PDF sites offer a few free actions and then push a paid plan.

Its format list is also unusually broad for a free service. DjVu, CBR, AVIF, DWG and DXF sit alongside standard Office conversions, and fixed-size compression targets remove the guesswork when a portal caps uploads. The trade-off is a narrower editor and no integrations, which keeps the product simple but limits it for teams.

Compatibilities and Integrations

PDFFly runs in any modern browser on desktop or mobile, but it offers no API or cloud storage integrations.

• Platforms: Windows, Mac, Linux, iOS and Android through the browser, with nothing to install.
• File formats: Office, image, ebook and CAD files, across more than 50 conversion routes.
• Languages: The interface comes in 12 languages, including Arabic, Greek, Vietnamese and Indonesian.
• AI provider: Summaries, chat and translation requests are processed through the OpenAI API.
• Integrations: No API, cloud storage links or browser extensions are listed.

PDFFly Tutorials

A first conversion on PDFFly needs no account and follows the same three-stage pattern on every tool.

1. Open the home page and choose the tool you need.
2. Upload or drag in your file, keeping it under 100 MB.
3. Pick the output format, compression target or translation language.
4. Run the action and download the result straight away.
5. For AI help, open the PDF Summarizer and ask questions in the chat.
6. Create a free account if you want results kept in My files.

How We Rated It

We rate PDFFly 3.8 out of 5, with top marks for cost and ease of use offset by weak integrations and limited editing.

Summary

PDFFly suits students, office staff and freelancers who want free conversions, OCR and AI summaries in the browser. Its format list and 100 MB limit are generous for a free service. The main limits are basic editing, no integrations and a short track record, and the AI tools send content to OpenAI. Keep confidential files away from the AI features. Download results promptly, because unsaved files are removed after two hours.