All-in-one document tools.
Simple. Fast. Free.

Scan, chat with, and transform your documents. Convert, compress, merge, split and more — free to use.

Drag & drop your PDF here or PDF up to 50MB · or scan with your camera

Password protection is the right control for a document you are about to email or hand over on a drive. Doclium encrypts the file with AES-256, so it cannot be opened without the password.

How to password protect a PDF

1Upload the PDF you want to protect.
2Choose a password.
3Download the encrypted file.

Questions people ask

What happens if I lose the password?

The file cannot be opened. Doclium does not store your password and cannot recover it, which is what makes the encryption meaningful.

What encryption is used?

AES-256, the standard supported by current PDF readers.

Related tools

Everything you can do, in one place

Compress PDF Shrink file size, with the real before/after shown Watermark PDF Stamp CONFIDENTIAL or your own text on every page Header & Footer Running header or footer with auto page numbers Resize to A4 One paper size for every page, scaled not stretched PDF to Markdown Clean .md with headings, lists and tables PDF to Word Layout-aware .docx with text, tables and images Merge PDF Combine documents into one, in the order you pick Split PDF Pull a page range out into its own document PDF to Image Every page as JPG or PNG, zipped for multi-page Chat with PDF Ask questions, every answer cites its source page Summarize Key points from a long document, with citations Translate Any language, side-by-side or replacing the original Highlight PDF Mark up text in six colours, readable in any PDF app Edit PDF Text Find and replace words, keeping size and colour Redact PDF Delete sensitive text for good, not cover it up Protect PDF Lock a document with AES-256 encryption OCR PDF Recover text from a scan so you can search it Rotate PDF Turn sideways pages the right way up, permanently Delete PDF Pages Drop blank or unwanted pages from a document Add Page Numbers Stamp numbers that survive printing

Free to use No account, no signup, no payment.

Encrypted in transit Your library is private to your device. Privacy policy.

Answers you can check Every AI answer cites the page it came from.

Works everywhere Install it as an app on phone or desktop.

The PDF toolkit that reads your documents too

Doclium is a free web app for working with PDFs: merge, split, compress, rotate, protect and convert them in your browser, with no install and no signup to start. Where most PDF tools stop at the file, Doclium also reads it — ask a question and get an answer that cites the page it came from, so you can check it.

Chat with a PDF, summarise a long report, or translate one into another language. Clean documents up with OCR, redaction, watermarks, headers and footers, page numbers and A4 or Letter resizing. Every change can be undone, and every export is previewed before it downloads.

Private by default Your library is yours alone. Documents are scoped to your account or device and are never readable by another user.

HTTPS everywhere All traffic is encrypted in transit with TLS. Your files are not used to train AI models.

Answers with citations The assistant quotes the passage and page behind each answer, so nothing has to be taken on trust.

Free to use The tools are free, with no watermark added to your output and no account needed to begin.

Open a document to read it here. Ask a question and the cited pages are highlighted.

Ask Doclium

Open a document from Library, then ask it something.

Document Actions

Encrypted in transit. Never used to train models.

Doclium

Scan, chat with, and transform your documents.

AI Tools

Quick Tools

No document open

AI Actions

Edit & Convert

Organize

Tools

Everything you can do to a document, in one place.

Create

Convert