Compare PDF Online

Upload two PDFs and see what changed between revisions side by side.

Quick Summary: Compare PDF Online

Upload two PDFs and see what changed between revisions side by side. Siliph runs in your browser with encrypted uploads and a built-in AI assistant for portal-specific settings.

What does Compare PDF Online do?

Upload two PDFs and see what changed between revisions side by side. Compare PDF highlights visual differences between two document versions—spotting text edits, moved figures, and replaced paragraphs during contract review.

When to use Compare PDF Online

  • You need to compare pdf online quickly without installing apps
  • The file contains sensitive data and you prefer local processing

Legal and procurement teams receive revised contracts where redlines are missing or untrustworthy. Side-by-side pixel or text-aware comparison surfaces added commas, deleted indemnity clauses, and swapped exhibits faster than manual line reading.

Siliph Compare PDF aligns pages in the browser-backed engine with encrypted uploads, marking additions in one color and deletions in another. Scanned comparisons work when OCR layers exist; purely image scans compare visually.

Use comparison output as an internal QA step before signing—export a summary PDF for audit trails showing exactly what changed between draft v3 and v4. Large documents may compare faster when you extract changed chapters first with Extract Pages.

Auto-deletion within two hours on the free tier protects negotiation confidentiality, and comparison requires no signup. Flatten PDF afterward if the comparison report itself must be immutable.

Pair with Redact PDF when differences reveal confidential third-party names that should not appear in the shared comparison file.

Siliph edit utilities—crop, rotate, headers, Bates numbers, metadata—apply changes in the browser with encrypted handling from the moment you drop a file. Finished PDFs auto-delete within two hours on the free plan, and every edit workflow opens without signup.

Visual Guide

How Compare PDF works

This interactive preview demonstrates the interface layout and processing controls you will find in our workspace above. Everything is designed to be fast, responsive, and completely secure.

Runs completely inside your browser
AES-256 secure encryption
Automated file clean-up within 2 hours
siliph.com/compare-pdf

Click or drag PDF files here

Supports files up to 50 MB / 50 Pages

Secure SSL WorkspaceLocal Browser Preview

How to use Compare PDF online — step by step

Follow these detailed steps to complete your task securely in the cloud.

1

Upload files

Drag and drop your files into the workspace, or click browse to choose files securely.

Drag & Drop files
2

Configure parameters

Adjust the settings available on the layout options panel to your preferences.

Configure settings
3

Process document

Click the process button to start editing securely in the cloud.

Processing...
4

Download output

Save the final processed file directly to your desktop or device.

Key Features & Benefits of Compare PDF

Discover why thousands of professionals trust Siliph for fast, high-quality document editing and conversion.

AI Tool Assistant

Built-in AI suggests optimal settings and answers questions for every PDF tool.

Rich Annotations

Modify pages layout. Add custom text elements, type boxes, and highlight blocks.

Handwritten Signatures

Draw your signature, type your name using a cursive font, or upload a stamp scan.

Visual Shapes

Draw rectangles, circles, arrows, and custom outlines directly on document sheets.

Frequently asked questions about Compare PDF

Upload two PDFs and see what changed between revisions side by side. Siliph is free to start — no signup required.

No. The tool runs in your browser on phone, tablet, or desktop.

Yes. Siliph lets you use Compare PDF for free. The free plan includes 3 tasks per hour with files up to 50 MB or 50 pages. Paid plans remove these limits and add priority processing.

Yes. Files are transferred over an encrypted HTTPS connection, processed automatically without human access, and deleted from our servers within 2 hours on the free plan.

No. Compare PDF runs entirely in your web browser and works on Windows, Mac, Linux, Android and iOS. There is nothing to download or install.

Embed this tool on your site

Add Compare PDF to your blog or website for free. The embed includes a dofollow backlink to Siliph when you use the attribution snippet below — that helps both sites rank.

Embed (iframe)

<iframe src="https://siliph.com/compare-pdf-online?embed=1" title="Compare PDF — Siliph" width="100%" height="620" style="border:0;border-radius:12px;max-width:900px;" loading="lazy" allow="clipboard-write"></iframe>
<p style="font-size:12px;color:#666;margin-top:8px;"><a href="https://siliph.com/compare-pdf-online" title="Compare PDF — Siliph" rel="dofollow">Compare PDF</a> powered by <a href="https://siliph.com/" title="Siliph — Free PDF Tools" rel="dofollow">Siliph</a></p>

Link for blog posts / tool lists

<p style="font-size:12px;color:#666;margin-top:8px;"><a href="https://siliph.com/compare-pdf-online" title="Compare PDF — Siliph" rel="dofollow">Compare PDF</a> powered by <a href="https://siliph.com/" title="Siliph — Free PDF Tools" rel="dofollow">Siliph</a></p>

Direct link: https://siliph.com/compare-pdf-online

Popular ways to use Compare PDF