Compare two PDFs by text, pixels and page structure without changing the sources.
Comparison checks two owner-scoped PDFs by page, text, hash and normalized page rendering.Comparison checks two owner-scoped PDFs by page, text, hash and normalized page rendering. The situations below show what this workflow is designed for so you can choose the tool before uploading a document.
The “Compare PDF online” workflow consists of 3 consecutive stages. Review the settings and expected output at each stage because processing creates a new copy instead of overwriting the source.
Upload the source PDF here.
Choose the settings and review the expected result before processing.
Download a separate result without changing the source file.
The capabilities below describe what is included in the workflow and the resulting file. Use them to confirm whether this tool completes the task or whether another processing stage will be needed.
Limits keep the result predictable by describing supported files, processing boundaries and PDF properties that may require manual review. Read them before starting, especially for complex documents.
The “Find changed pages” scenario follows a source file through to a separate result. It shows which action is performed and what should be checked after download.
The file is processed only inside a temporary guest session. Access closes when the session ends, and source and result files follow the service deletion lifecycle.
These answers apply specifically to “Compare PDF online” and extend the main instructions. They cover settings, expected output and the cases that most often need clarification before processing.
A JSON summary and a visual diff PDF are created.
No. The report stores hashes and counts, not full extracted text.
No. The result reports aggregate differences without returning the full document text.
When processing cannot continue, the service shows a reason code and a safe next step. Resolve the stated issue and upload again or choose another mode; the source document remains unchanged.
COMPARE_SOURCE_INVALIDThe second source is missing, duplicated or outside the current session.
Upload exactly two PDF documents owned by the current session.COMPARE_RESOURCE_LIMITThe comparison exceeds current page or render limits.
Split or reduce the documents before comparing them.Practical guides provide context that does not fit into a short procedure: how to choose a mode, understand processing consequences and handle the document safely.
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