Text comparator (diff)
Compare two versions of a text or a file and see at a glance what was added, removed or left unchanged, with line numbers. Options ignore case and whitespace when that noise is not the point. The comparison is local, so two documents you compare never leave your machine.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
Comparing two versions of a contract, a configuration file or a legal text is tedious by eye: a changed number in the middle of the page escapes every comparison. This tool computes the differences between two texts and highlights them, word by word.
Additions and deletions are marked with different colours, and the diff algorithm used is the same as that of version control tools: the result is the minimal set of changes that turns one text into the other.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
Can I compare two files instead of pasting text?
Yes, drop two files (text, code, CSV…) or paste the content directly. The comparison is performed locally in your browser.
How are the differences calculated?
By a diff algorithm on the word sequence: the tool finds the longest common subsequences and marks what is added, removed or moved. A reformatted line whose content has not changed is not flagged.
Is my content sent anywhere?
No, the whole comparison happens in your browser. You can compare two contracts without them leaving your device.