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This block mirrors the system review flow: score first, then an optional private note.
A quick way to understand who this helps, what it solves, and where it connects next.
Docs writers, maintainers, PMs, and developers reviewing README, changelog, or docs changes.
Comparing two Markdown versions when the source-level text changes matter more than a rendered visual diff.
Capture markdown-diff-viewer intent with a source-first browser diff tool for docs and README revisions.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
To compare two Markdown versions, paste the original text on one side and the updated text on the other. The viewer computes a source-level diff and highlights added, removed, and changed lines so you can see precisely what moved between the two versions.
Because the diff works on the Markdown source rather than rendered HTML, small but important edits stay obvious, a changed heading level, an edited link target, a flipped checklist item, or a tweaked table cell. You can also copy a change summary to drop into a review note or commit message.
All comparison happens locally in your browser. Neither version is uploaded to a server, so you can safely diff private drafts, internal docs, or unreleased changelogs.
Rendered Markdown diffs can hide small but meaningful changes, because two different sources can render to similar-looking output. A source-first diff keeps headings, links, checklists, and table edits clearly visible, which is exactly what reviewers need.
This makes the viewer well suited to README and changelog reviews, where you care about the literal Markdown that will be committed, not just the visual result. It helps catch accidental link breakage, heading shifts, and list changes before they ship.
The first version focuses on source-text diffing only, keeping the comparison fast, predictable, and easy to trust.
Short answers for the questions people usually have before trying a utility like this.
Yes. This tool is completely free to use, with no sign-up required.
No. Both versions are compared locally in your browser, so your text never leaves your device.
No. The viewer focuses on a source-text diff so that headings, links, checklists, and table edits stay clearly visible.
Yes. README and changelog reviews are among the strongest everyday uses, since a source diff shows exactly what will be committed.
Yes. Alongside the highlighted diff, you can copy a practical summary of the changes for a review note or commit message.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Paste the original and updated Markdown, compare the source changes locally, and copy the diff summary without rendering noise.