Instantly compare files, text, and URLs to find added, removed, or modified content. EasyToolkit's free Content Difference Checker online, works entirely in your browser — no signup, no uploads, no software.
Compare results will appear here
TXT, MD, CSV, JSON, HTML, LOG
TXT, MD, CSV, JSON, HTML, LOG
Add multiple text blocks to compare each consecutive pair (1→2, 2→3, etc.) or paste all at once into the text comparison tab.
EasyToolkit's free online diff checker makes it simple to compare files, detect changes between two text versions, and identify added or removed words instantly. It works without signup, software installation, or file size limits — your content never leaves your browser.
Select Text Comparison to paste content, File Comparison to upload documents, URL Comparison to compare web pages, or Bulk Compare for multiple blocks.
Paste original and modified text, upload files (TXT, CSV, JSON, HTML, LOG), or enter two URLs. The tool accepts any plain-text format for accurate comparison.
Choose to ignore case, extra whitespace, or HTML tags when formatting differences are not relevant to your comparison task.
Click Compare. Added words appear in green, removed words in red. Switch between inline and side-by-side view. A similarity score is shown instantly.
An online diff checker — also called a text comparison tool, file diff tool, or document comparison utility — compares two versions of content and highlights exactly what has changed. It detects added, removed, or modified words, sentences, lines, and formatting differences instantly without any software installation.
EasyToolkit's diff checker works at the word level to compare content with high accuracy. It supports plain text, uploaded files, and live website URLs — all processed securely inside your browser. Unlike desktop tools like WinMerge or KDiff3, there is nothing to install and nothing is uploaded to a server.
The tool uses the Longest Common Subsequence (LCS) algorithm — the same method used by Git, Unix diff, and most version control systems — to find the minimum set of changes between two texts. According to MDN Web Docs, diff-based systems are the backbone of software development and collaborative editing workflows worldwide. Operating at the word level (rather than character or line level) gives you more readable, human-friendly output.
Compare article drafts, rewritten content, or edited documents to quickly spot every change between versions before publishing.
Compare code snippets, JSON responses, HTML templates, or config files. Pair with our JSON Formatter for faster debugging.
Use URL comparison to track content changes on landing pages, monitor competitor updates, and verify that edits were published correctly.
Compare essay drafts, research revisions, and assignment edits. Verify that all requested changes were applied accurately before submission.
Review contracts, agreements, and policy documents for unauthorised edits or clause changes between signed and current versions.
Compare translated or localised content across versions to ensure updates were applied consistently in all language variants.
Manually reviewing long documents, source code, contracts, or web pages for changes is slow, error-prone, and impractical at scale. A dedicated diff tool automates this in seconds — even across large files and lengthy documents — so you can focus on acting on the differences rather than finding them.
Common tasks people use this free diff checker for:
| Feature | EasyToolkit (this tool) | Diffchecker.com | WinMerge | Git diff |
|---|---|---|---|---|
| Free to use | ✔ Yes | Limited free tier | ✔ Yes | ✔ Yes |
| No software install | ✔ Browser-based | ✔ Browser-based | ✘ Install required | ✘ Install required |
| URL comparison | ✔ Yes | ✘ No | ✘ No | ✘ No |
| File upload compare | ✔ Yes | ✔ Yes (Pro) | ✔ Yes | ✔ Yes |
| Data stored on server | ✔ Never | Yes (cloud) | ✔ Never | ✔ Never |
| Word-level diff | ✔ Yes | Line-level only | Line-level only | Line-level only |
| Similarity score | ✔ Yes | ✘ No | ✘ No | ✘ No |
Yes — completely. All comparison processing runs directly inside your browser using JavaScript. Your text, files, and URLs are never permanently uploaded, stored, or logged on any external server. This makes it safe to use with confidential business documents, contracts, source code, and sensitive data.
Because processing happens locally on your device, this tool provides stronger privacy than cloud-based alternatives that require server uploads to function. Closing your browser tab automatically removes all temporary data from memory.
For URL comparison, page content is fetched through a CORS proxy to handle browser restrictions. If you need to compare sensitive or private pages, use the Text Comparison tab by pasting content directly — no network request is made in that mode.
You can pair this tool with other browser-based utilities from EasyToolkit — such as the JSON Formatter & Validator, Image to Text OCR, and Image Format Converter — for a fully private, browser-based productivity workflow.