# PDF Diff Compare two PDF documents page by page and highlight text differences > Canonical page: https://elysiatools.com/en/tools/pdf-diff - **Category:** Document Tools - **Keywords:** pdf, diff, compare, difference, changes ## Overview Extract text page by page from two PDFs and diff at word, line or character level, reporting per-page status and overall similarity. ## Inputs - **Original PDF** (file) - **Modified PDF** (file) - **Comparison Mode** (select) - **Case Sensitive** (checkbox) - **Ignore Whitespace** (checkbox) ## When to use - When reviewing contract revisions to ensure no unauthorized text changes were introduced. - When verifying that a newly exported PDF matches the text content of an older draft. - When auditing multi-page documents for minor typos, punctuation updates, or formatting shifts. ## How it works - Upload the original PDF and the modified PDF document into the designated file inputs. - Select your comparison mode (word-level, line-level, or character-level) and configure case sensitivity and whitespace preferences. - Run the tool to extract text page-by-page and generate a JSON report detailing overall similarity and specific text differences. ## Use cases - Legal document auditing to track clause modifications between contract drafts. - Academic paper proofreading to verify edits made during peer review. - Technical manual verification to confirm that updated specifications match original text requirements. ## Frequently asked questions ### What comparison modes are supported? You can compare documents at the word, line, or character level. ### Can I ignore capitalization differences when comparing PDFs? Yes, you can disable the case-sensitive option to ignore capitalization differences. ### Does the tool compare images or visual layouts? No, this tool extracts and compares text content page by page; it does not perform visual or image-based layout comparisons. ### How does the tool handle spaces and line breaks? You can enable the ignore whitespace option to prevent formatting spaces from flagging differences. ### What output format does the tool generate? The tool outputs a JSON report containing page counts and an overall similarity score. ## Related tools - [PDF Watermark Tool](https://elysiatools.com/en/tools/pdf-watermark-tool): Apply document-level or page-level text/shape watermarks with rotation and transparency - [2026 PDF Calendar Designer](https://elysiatools.com/en/tools/pdf-2026-calendar-designer): Design and export stylish 2026 printable PDF calendars with bimonthly, quarterly, semiannual, or annual single-page layouts - [PDF RTL/LTR Support Tester (PDF双向文字测试)](https://elysiatools.com/en/tools/pdf-rtl-ltr-support): Preview left-to-right and right-to-left text flow in PDF with bidi reordering - [PDF Secure Redaction Sanitizer](https://elysiatools.com/en/tools/pdf-secure-redaction-sanitizer): Permanently remove PDF text and hidden page objects by rebuilding an image-only PDF. - [OCR PDF to Structured JSON Bridge](https://elysiatools.com/en/tools/ocr-pdf-to-structured-json-bridge): Extract the PDF text layer with geometry (lines by y-position, tables by column gaps, headings by font size, colon key-value pairs), then fill a user-supplied JSON Schema field by field — labels matched by normalized keys, values coerced to declared types and validated with ajv. - [PDF Text Extractor](https://elysiatools.com/en/tools/pdf-text-extractor): Extract text content from PDF documents with support for page selection, formatting options, and multi-language processing - [PDF to Text Advanced](https://elysiatools.com/en/tools/pdf-to-text-advanced): Advanced PDF to text converter with page selection, formatting options, and metadata extraction - [PDF to Word](https://elysiatools.com/en/tools/pdf-to-word): Convert PDF files to editable Word documents (.docx) by extracting text and preserving basic formatting ## Samples - [PDF Samples](https://elysiatools.com/en/samples/pdf-samples): Generated PDF samples from tools dated 2026-02-01 to 2026-02-10 - [Markdown Slide Deck Samples](https://elysiatools.com/en/samples/md-slide-deck-to-pdf): Remark/Marp style Markdown slide decks for testing PDF export layouts - [Time Zone Workflow Scheduler ICS Samples](https://elysiatools.com/en/samples/time-zone-workflow-scheduler-ics-samples): ICS files generated in the same structure returned by the Time Zone Workflow Scheduler, with multiple VEVENT meeting candidates exported from overlap windows - [Distributed Tracing Samples](https://elysiatools.com/en/samples/distributed-tracing-samples): Comprehensive distributed tracing examples using Jaeger, OpenTelemetry, and other modern observability tools for microservices architecture ## Related content - [File and Data Diff Comparison Tools](https://elysiatools.com/en/hubs/file-data-diff-comparison-tools): Compare two candidate artifacts, choose the right diff path for the format, review structural or semantic changes, and finish with integrity checks when approval needs byte-level certainty.