Compare two Markdown files — free, in your browser
To compare two Markdown files, drop both into Diffesq: side-by-side and unified views show every changed line with word-level highlighting, free and unlimited, without uploading either file. The comparison is source-level — the raw Markdown, not a rendered preview — so link targets, front matter, table pipes, and code fences are all part of it.
Markdown is one of the two formats that are free at full fidelity, permanently: no truncation, no 30% preview, no account, and no trial clock.
How it works
- Drop a
.mdor.markdownfile on each side of the workbench. - The comparison computes on your device, with Markdown syntax highlighting in both panes.
- Switch between side-by-side and unified views and step through the changes with Prev/Next.
- Export a report if you need a record — free gives one watermarked sample, Pro exports are clean.
What the comparison covers
- Line-level comparison with intraline highlighting, so one retyped word inside a long paragraph is pinpointed instead of reddening the whole line.
- Markdown syntax highlighting in both panes — headings, emphasis, links, and code fences stay legible while you read the diff.
- Source-level by design: front matter, reference-style links, raw HTML blocks, and table formatting are compared as written. A rendered-preview comparison is not part of this release.
- Both files are parsed with a real Markdown parser so each line is attributed to the block it belongs to. If that parse fails, the comparison says so and falls back to plain lines — it is never silently different.
- Free and unlimited at full fidelity — the complete result, never a preview.
- Very large documents keep scrolling responsive by dropping syntax highlighting past roughly 1 MB or 30,000 lines; the comparison itself is unaffected.
Free vs Pro
Markdown comparison is free, unlimited, and complete — the whole result, not a preview, and that is a permanent guarantee rather than a trial. Pro adds the structured and binary formats (Word, Excel, PDF, JSON, YAML, XML, datasets, folders, images), structural source-code diffs, and unwatermarked exports.
See Pricing for plans — $2.97/month, $27.99/year, or $49 once.
Privacy
Every comparison runs locally in your browser. Your files are never uploaded — there is no server that receives them, and the page keeps working with Wi-Fi turned off. Details in the Privacy Policy.
Frequently asked questions
Does it compare the rendered Markdown or the source?
The source. That is deliberate for docs and READMEs: a changed link target or a reordered table column is a real change even when the rendered output looks similar, and a rendered-only comparison would hide it.
Is Markdown really free forever?
Yes. Text and Markdown are free at full fidelity as a matter of policy, not a promotion — every comparison runs complete, with no file-count limit, no account, and no trial clock.
What about .mdx or other Markdown-ish extensions?
Files named .md or .markdown are treated as Markdown. Anything else compares with the free text diff instead — the same line and word-level view, without the Markdown block awareness.
Does it work offline?
Yes — once the page has loaded, parsing, comparing, and rendering all happen on your device. Turn off Wi-Fi and it still works.