Compare two texts side-by-side and highlight differences instantly.
Text comparison is performed entirely in your browser.
Paste your first piece of text into the left panel.
Paste your second piece of text into the right panel.
Instantly see additions, deletions, and modifications highlighted.
Clear color-coded highlighting for added and removed text.
Differences are computed in real-time without refreshing the page.
Your data never leaves your computer. Everything happens in the browser.
Curated tools to help you complete your task faster.
Comparing text files to identify modifications, deletions, or additions is a common task in software engineering, legal review, and copywriting. Known as 'diffing', this process highlights line-by-line and word-by-word alterations to help you track revisions, verify code patches, or review contract versions.
Many online text editors require you to send your data to external APIs to run comparison algorithms. If you are comparing proprietary source code, confidential legal terms, or private document revisions, this introduces substantial privacy compliance risks. FlowFix does diff computations entirely client-side. The differences are generated locally inside your browser memory, keeping your documents confidential.
Our tool uses intuitive visual markers: deletions are marked in soft red with strikethroughs, and additions are marked in bright green. This lets you quickly scan through large files and isolate exact differences without manual checking.
Writers use text comparison to trace edits across draft versions, developers use it to verify configurations before staging updates, and legal teams use it to cross-reference contract clauses to ensure terms remain unchanged.
In traditional cloud infrastructure models, performing basic tasks like document merging or image cropping requires uploading files to remote servers. This introduces substantial privacy hazards, bandwidth bottlenecks, and latency issues. FlowFix completely circumvents this design pattern by leveraging WebAssembly (WASM) and localized client-side JavaScript execution. When you run a tool on this platform, the code executes directly within your browser sandbox, using your device's native CPU and memory resources.
Because no file bytes ever traverse the network to our servers, your private documents, financial sheets, scanned forms, and photographs remain entirely inside your control. There is no server database running behind this tool that logs your file content, nor are there any temporary file caches generated. This client-side processing methodology provides the convenience of a modern web application alongside the absolute privacy guarantees of offline desktop software.