Markdown Compare Tool

Compare Markdown files with live line diffs, synchronized scrolling, editing, rendered preview, and private browser processing.

LEFT: release-v1.md

1# Release Notes

3-## Version 1.0

4-- Side-by-side diff layout

5- Synchronized scrolling

6-- Draft, not yet reviewed

8-Status: draft

RIGHT: release-v2.md

1# Release Notes

3+## Version 2.0

4+- Side-by-side and unified diff layouts

5- Synchronized scrolling

6+- Live editing and HTML preview

7+- Export each file as .md

9+Status: published

Comparing release-v1.md vs release-v2.md — Multi-file sidebar & download support

✓ 100% Private Client-Side

One Workspace for Every Markdown Comparison

Markdown Compare keeps the file queue, active documents, and live diff in one private workspace.

Markdown Compare workspace with a file queue and side-by-side red and green line diff — File queue, side-by-side panes, line highlighting, and live change totals.

Markdown Compare: See Exactly What Changed, Line by Line

Markdown Compare marks removed lines red and added lines green, with totals that update as the documents change.

Original (Left)

Revised (Right)

Two Layouts, Three Ways to Read the Diff

Review two files in synchronized panes or a unified stream, then switch between diff, raw editing, and rendered preview.

Side-by-Side dual panes or a full-width Unified Stream
Diff Highlight, live Edit Raw, and rendered Preview HTML
Old and new line numbers shown on every changed line
A live +added / −removed tally that updates as you type

Everything the Markdown Compare Tool Does

Core Markdown Compare features for reviewing and exporting document revisions.

Visual Line-by-Line Diff

Markdown Compare marks removed lines red, added lines green, and updates the change count as you edit.

Flexible Diff Layouts & Modes

Switch between side-by-side or unified layouts, then inspect the diff, edit raw Markdown, or preview rendered HTML.

Multi-File Queue & Selection

Upload or drop multiple files, choose any two from the sidebar, and swap the left and right documents instantly.

Synchronized Scrolling

Keep matching sections aligned while scrolling side-by-side, or turn Sync Scroll off to move each pane independently.

Copy & Download as .md

Copy or download either Markdown document directly from its comparison pane.

Fullscreen Focus Mode

Expand Markdown Compare to the full viewport when reviewing long or dense documents.

How to Compare Markdown in 3 Steps

Load two Markdown files and review the comparison without an account or installation.

Load your Markdown files

Drop or upload .md, .markdown, or .txt files, or add blank documents.

Select Left and Right documents

Choose any two files, then select side-by-side or unified layout and optionally enable Sync Scroll.

Inspect diff, edit & export

Review highlighted changes, edit or preview either side, then copy or download the Markdown.

Your Markdown Never Leaves Your Browser

Markdown Compare handles the diff, editor, preview, and file access locally in the current browser tab.

Markdown comparison, editing, and preview rendering stay in your browser.
Core Markdown Compare features keep working after the page loads.
Drafts and internal documentation remain on the current device.

Who Compares Markdown Files?

Common Markdown Compare workflows for documentation, editorial review, and AI output.

Release Notes & Technical Specs

Use Markdown Compare to review changelogs, API documentation, README files, and specifications before publishing.

Writing & Editorial Review

Compare article drafts, contributor changes, meeting notes, and documentation revisions line by line.

Documentation Version Control

Review changes to specifications, policies, release plans, and shared knowledge-base pages before approval.

AI Output Comparison

Compare two LLM responses or prompt variants to inspect wording and structural changes.

Need a Multi-Document Markdown Comparison?

Markdown Compare reviews any two queued files at a time. For several simultaneous preview columns, use the Markdown Viewer workspace.

Preview several selected Markdown documents side by side
Rename, export, or download selected files as a ZIP

Open Markdown Viewer

Markdown Compare — Frequently Asked Questions

Answers about Markdown Compare layouts, editing, files, privacy, and export.

How does the Markdown compare line diff work?

Markdown Compare uses a line-based diff: removed lines appear red, added lines appear green, and the change count updates as either document changes.

Can I load more than two Markdown files?

Yes. Keep multiple files in the sidebar and choose any two for the active Markdown comparison.

What is the difference between Side-by-Side and Unified Stream?

Side-by-Side uses two parallel panes. Unified Stream combines removed, added, and unchanged lines into one sequence.

Can I edit and preview Markdown while comparing?

Yes. Edit Raw updates the diff live, while Preview HTML renders both documents with GitHub-style formatting.

Which files does Markdown Compare support?

Upload or drop .md, .markdown, and .txt files. The line diff processes up to 2,500 lines from each active document.

Can I synchronize scrolling or swap documents?

Yes. Sync Scroll keeps side-by-side panes aligned, and the swap button reverses the left and right documents instantly.

Can I copy or download the result after a Markdown compare?

Yes. Each pane can copy its Markdown or download it as a clean .md file.

Is my Markdown comparison uploaded?

No. File handling, diffing, editing, and preview rendering run locally in your browser.

Does Markdown Compare work on mobile?

Yes. The responsive workspace supports uploading, comparing, editing, and exporting on smaller screens.

Compare Your Markdown Files Now

Select or upload two files and inspect their private, line-by-line Markdown comparison.