Free PDF Tools for Contracts & Legal Documents
Contract and legal document work has specific needs: catching every change between two versions, permanently removing confidential details before sharing, signing final versions, and assembling exhibits into one file. These tools handle each, with a privacy model (24-hour hard deletion, no data sharing) that matters more here than almost anywhere.
The tools you'll use most
- Compare PDFCatch every difference between a draft and a revised contract — a single changed clause or number — instead of re-reading both.
- Redact PDFPermanently remove names, account numbers, or confidential terms before sharing a document — the text is gone, not just hidden.
- Sign PDFSign the final agreement once you've confirmed the terms, without printing and scanning.
- Merge PDFAssemble a contract and its exhibits or schedules into one continuous, numbered document.
- Protect PDFAdd a password before sending a sensitive agreement so only the intended recipient can open it.
The privacy model matters most here
Legal documents are exactly the files you don't want lingering on a server. Every tool here transfers over HTTPS to encrypted storage and hard-deletes the file within 24 hours via a storage-layer lifecycle policy — not a background job that might be forgotten. Documents are never used to train AI models.
Redaction specifically is done properly: the underlying text is removed, not covered with a black box that can be copied out or deleted to reveal what's beneath — a common and serious mistake with naive redaction.
A realistic contract workflow
When a counterparty returns a "lightly revised" contract, run Compare PDF against your version first — the changed clause is often buried. Once you've confirmed the edits, redact anything confidential before circulating internally, sign the final, and if you're sharing a sensitive copy externally, password-protect it.
Frequently asked questions
Is redaction here actually permanent?
Yes — redaction removes the underlying text rather than drawing a box over it, so the removed content can't be copied out or recovered from the file.
Are legal documents used to train AI?
No. Your documents are used only to produce the result you asked for and are never used for model training. Files are hard-deleted within 24 hours.
Can I compare two contract versions?
Yes — Compare PDF surfaces the differences between two versions so you can see exactly what changed before signing.
Is the e-signature valid for legal agreements?
An electronic signature is suitable for many agreements, but requirements vary by jurisdiction and document type. Where a specific certified/qualified signature is legally required, use a certified provider.