Compare two texts or files line by line — additions and removals highlighted — privately in your browser.
Original
Changed
+2−2
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InfyTool
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free file tools
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free online tools
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nothing is uploaded
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fast
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fast and private
Both texts are compared in your browser — nothing is uploaded. Drop a file onto either box to load it.
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Diff Checker
Paste or drop the original and the changed version.
Additions and removals are highlighted line by line.
Toggle ignore-whitespace, ignore-case or only-changes.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
Spot every change
Paste two versions of anything — code, config, prose, a CSV — and see exactly what changed: added lines in green,
removed lines in red, aligned so matching lines line up. A running count tells you how much moved, and Only changes
hides the unchanged lines when a file is long.
Both sides are compared in your browser, so source code and contracts never leave your device. Drop a file onto
either box to load it. To tidy the inputs first, JSON Formatter and
HTML to Markdown can normalise them before you diff.
Frequently asked questions
What can I compare?
Any two blocks of text — code, config, prose, CSV, logs — pasted or loaded from files. The tool aligns matching lines and marks what was added or removed.
Are my files uploaded?
No. The comparison runs entirely in your browser, so contracts, source code and other sensitive text never leave your device.
What do the options do?
Ignore whitespace collapses spacing differences, Ignore case treats A and a as equal, and Only changes hides the unchanged lines so you see just the edits.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.