What's the difference between Personal and Studio?

Personal ($39) is for one person — unlimited use on one active device at a time. Activate on a new device and the old one signs out. Studio ($199) is for teams and commercial client work — unlimited team members, early access to new tools, and a commercial license.

Do I need an account?

No. Use any tool free up to 5 times per day on compute-heavier tools, and unlimited on lightweight ones. No card, no account, no signup required.

Where are my files processed?

Right on your device. Files never upload to any server. Everything runs in your browser — you can verify in DevTools → Network.

What happens if I use my Personal license on a second device?

The new device activates and the old device signs out. Your license key stays the same — you just move it between devices as needed. No limit on how often you switch.

Does this work on my phone?

Yes. Every tool works on iPhone, Android, tablet, and desktop.

What if I want a refund?

30-day money-back guarantee on both tiers. No questions asked. Email sales@cipherforces.com.

Will you add more tools?

Yes. New tools ship regularly. Your license includes every tool we ever release — Studio members get early access.

Pdf

Compare PDFs

Visual pixel-level or text line-level diff between two PDFs, page by page.

By Daniel BeglaryanUpdated August 2026

PrivateWorks OfflineNo Account

100% Private Works Offline In Your Browser

Original PDF

Drop original PDF

or click to browse

PDF

Max 100MB

Revised PDF

Drop revised PDF

or click to browse

PDF

Max 100MB

Compare two PDFs

Upload an original and a revised PDF to see the differences highlighted visually, or as a line-by-line text diff.

0/3free today

Deep dive

About Compare PDFs.

See the Differences Between Two PDF Files

Upload two PDFs and CipherForces PDF Compare shows the differences in two modes:

Visual mode: Renders each page of both PDFs at the same resolution and tints differing pixels red, so you can see at a glance where anything changed — text, layout, images, or spacing.
Text mode: Extracts text from both PDFs using pdf.js and runs a line-level diff, marking added and removed lines per page.

Comparison runs page-by-page on the shared page range; if the two PDFs have different page counts, the extra pages are noted but not diffed. Runs entirely in-browser — neither PDF is uploaded.

Common Use Cases

Contract redlines: Spot layout and text changes between two versions of a legal agreement.
Editorial review: Compare a draft and a revised manuscript.
Compliance audit: Verify changes between two dated policy documents.
Invoice reconciliation: Confirm vendor line-item changes month-over-month.

Key Features

Visual pixel diff: Rendered overlay showing every visual change, including image and layout shifts.
Text line diff: Line-by-line added/removed highlights extracted from the PDF text stream.
Side-by-side view: Left = file A, right = file B, with synchronized scrolling.
Page-count warning: If A and B have different numbers of pages, the tool flags the mismatch so you don’t miss trailing changes.

Privacy: Both PDFs are parsed and compared locally. Neither uploads.

FAQ

Frequently asked questions.

How do I compare two PDFs to see what changed?

Open the Compare PDFs tool, add your original PDF and the revised PDF, then choose visual pixel-level or text line-level mode. The tool diffs each page side by side and highlights every change. You can step through pages one at a time to spot edits, additions, and deletions.

Is it safe to compare confidential PDFs in this tool?

Yes. The comparison runs entirely in your browser using JavaScript and WebAssembly, so neither PDF is ever uploaded to a server. Your files stay on your own device the whole time. There is no signup and no account, which makes it suitable for contracts, legal drafts, and other sensitive documents.

What is the difference between pixel-level and text-level PDF diff?

Pixel-level diff compares the rendered image of each page, catching layout, formatting, font, and image changes. Text line-level diff compares the extracted words line by line, which is better for tracking wording edits. Pick pixel mode for design changes and text mode for content revisions.

Can I compare two PDFs for free without installing software?

Yes. Compare PDFs is free and runs directly in your web browser, so there is nothing to download or install. It works on any modern browser, requires no signup, and lets you diff two PDFs page by page at no cost.

Three steps