Drop the first (original) PDF, or click to browse for it.
Select a second PDF, choose text + metadata or metadata-only mode, then tweak the diff settings.
A clean PDF report opens with per-page diffs.
Download it to share with reviewers.
Upload PDF A, drop in PDF B, choose your diff options, then download a structured PDF report. Comparison runs locally so your documents stay on your device.
Need to find out what changed between two versions of a contract, quote, or report? IronFreeTools' Compare Two PDFs tool pulls the text out of both files, lines them up page-by-page, and produces a downloadable diff report you can share with reviewers.
PDF comparison is a daily task for legal, finance, and engineering teams. Instead of squinting at two open documents to find a missing paragraph or a swapped figure, run them through a structured diff and get a single PDF that calls out every added or removed line, along with metadata changes.
Document revisions are easy to miss when you eyeball them. A line-by-line comparison surfaces edits that would otherwise slip through, including last-minute clause changes, swapped totals, renamed sections, and silent metadata updates from the authoring application.
Upload PDF A, then drop in PDF B. The tool reads the text layer of every page with pdfjs-dist, runs a longest-common-subsequence diff per page, and writes a structured PDF report with pdf-lib. For developers automating document comparison or large-batch text extraction in .NET, IronPDF's text extraction API and the broader IronPDF edit features cover the same workflow at scale.
The tool extracts the text layer from each page of both PDFs, runs a line-by-line diff, and produces a comparison report PDF. The report highlights added, removed, and unchanged lines for each page and lists metadata differences such as title, author, and modification date.
No. This tool focuses on the embedded text layer of each PDF and on document metadata. Scanned image-only PDFs without a text layer will return empty pages because there is nothing for the diff engine to read.
It collapses runs of spaces and tabs and trims line ends before comparing, so two lines that only differ in spacing are treated as identical. This usually cuts a lot of noise from documents that were re-exported.
It lowercases both files before comparison so 'Total' and 'TOTAL' match. The original casing is preserved in the report; only the comparison key is normalized.
When the two PDFs have a different page count, the extra pages exist on only one side. The report shows those pages with a badge so you can see which side has the additional content.
No. Both files are read in your browser using pdfjs-dist and pdf-lib. The comparison runs locally and nothing is sent to a server.
Encrypted PDFs need to be unlocked first so the text layer can be read. Use the free Unlock PDF tool on owned files before running the comparison.
No fixed limit. Long PDFs may take longer because the entire diff runs in your browser, so very large documents are constrained by your device's memory.
No. Compare Two PDFs is free to use without sign-up, login, or installation.
Spot added and removed lines page-by-page See metadata differences at a glance Ignore whitespace and letter case noise Browser-only processing for sensitive documents Download a shareable PDF report No account, no watermark, no upload.