Free PDF Tools. In your browser.

It depends entirely on whether the tool uploads your file. Most free PDF websites send your document to their servers, process it there, and delete it after a retention window you have to trust. PDFNinja never transmits your file at all — the PDF is read into memory by JavaScript running in your own browser, modified locally, and handed back as a download. Ten of our eleven tools send nothing across the network, which is why they are usable for documents that cannot legally leave a device, such as medical records, legal discovery, HR files and financial statements. The one exception is Translate PDF, which must send the extracted text (never the file itself) to a third-party translation service; that tool carries a warning on its own page and should not be used with confidential documents.

Yes, it is free, and there is no paid tier. There is no signup, no daily limit on how many files you can process, no watermark added to your output, and no feature held back behind an upgrade. The honest trade-off is not price but performance: because processing uses your own device’s CPU and memory, very large files or OCR across many pages run slower than a server-based service would.

No. PDFNinja runs entirely in a normal web browser with no installation, no browser extension and no account. Open the tool page, choose your file, and it works immediately. It requires JavaScript and works in current versions of Chrome, Firefox, Safari and Edge.

The interface accepts files up to 100 MB. The practical ceiling is your device rather than a server quota, since the whole document is held in browser memory while it is processed. Large scanned PDFs and OCR jobs are the most memory-hungry operations; on an older phone or a low-memory laptop you may want to split a very large document first.

No. Output files are clean, with no watermark, badge, footer or metadata stamp added. The Watermark PDF tool exists so you can deliberately add your own text, such as DRAFT or CONFIDENTIAL, but nothing is ever added without you asking for it.

Mostly yes. Once the tool page has loaded, the processing itself needs no network, so you can disconnect and the tool still works. The exceptions are features that fetch extra data on demand, such as OCR language files and translation.

The core difference is architecture. iLovePDF, Smallpdf and Adobe’s online tools are server-side: your file is uploaded, processed remotely, and stored temporarily. They are faster on very large documents and offer more advanced editing. PDFNinja is client-side: the file never leaves your device, there is no queue and no upload wait, and there are no daily caps or watermarks on the free tier. Choose a server-based tool for heavy editing of non-sensitive files, and PDFNinja when privacy, speed on ordinary files, or unlimited free use matters more.