Text and code diff
Review changes in source code, JSON, XML, logs, configuration files, Markdown, and plain text with split or unified views.
CompareCode
Free and open-source diff checking tool for code, text, images, and Markdown.
Browser-based comparison
Compare code, text, images, and Markdown without switching tools
CompareCode is built for developers who need fast visual review of text changes, code diffs, screenshots, image differences, and Markdown drafts. The core workflows run in the browser and do not require an account.
Visual image diff
Compare screenshots and images with side-by-side, fade, slider, heatmap, threshold, and alignment tools.
Markdown preview
Draft Markdown with live preview, GitHub-style formatting, rich paste support, Mermaid diagrams, KaTeX formulas, and session undo/redo.
Local workflow
Use local comparison history, browser draft persistence, and session history tools without creating an account.
How it works
- 1. Choose text comparison, image comparison, or Markdown preview.
- 2. Paste text, drop images, write Markdown, or use the browser inputs for your files.
- 3. Review highlighted differences, adjust options, merge text changes, or preview Markdown output.
Supported comparison types
CodePlain textJSONXMLHTMLCSSJavaScriptTypeScriptMarkdownMermaidKaTeXLogsScreenshotsImages
CompareCode FAQ
Quick answers about what CompareCode supports, how it works, and what is stored locally in your browser.
CompareCode was created to give people a free, ad-free place to compare text and code, review image differences, and preview Markdown files in one browser-based workspace. The goal is a customizable, user-friendly tool focused on useful features instead of ads, paywalls, or distracting upsells.
Paste the original text on one side and the modified text on the other, then run the comparison. After the diff is generated, you can merge changes between the original and modified versions, switch between word and character precision, choose split or unified layout, and fine-tune helper options for your workflow.
Choose two images from your computer or drag and drop them into the image comparison tool. CompareCode will compare them automatically. If the image dimensions do not match, you can use auto align to fit them together, or adjust the alignment manually if you want more control.
Drop a Markdown or text file into the editor, paste content from your clipboard, or write directly in CompareCode. You can preview the rendered result, insert tables and alerts, and format the document with common Markdown actions while you work.
CompareCode saves text compare and image comparison sessions in your browser so you can reopen them later. You can restore previous items, bookmark important comparisons, or delete entries you no longer need.
The settings page lets you choose a theme, adjust text comparison highlight colors, and configure the date and time format used in the history view.
No. CompareCode runs directly in your browser, so the main workflows do not require registration or sign-in.
Comparison history is stored locally in your browser's IndexedDB storage. Markdown drafts use browser storage as well, so you can keep working without creating an account.
Yes. CompareCode is free and open source. Feedback, bug reports, and feature ideas are welcome through the GitHub repository.
No. CompareCode is designed to stay calm, fast, and focused on practical comparison workflows without ads or paywalls.
Please report it through the GitHub repository linked below.