Compare File and Code Differences Online
The Erapse codediff & File and Code Compare Tool makes it easy to compare two files, code snippets, or blocks of plain text online. Paste the original content on the left and the updated content on the right, then run the comparison to see added, removed, changed, and unchanged lines in a clear side-by-side view. It is a free online file and code comparison tool that requires no desktop software or installation, making it useful for quickly reviewing changes.
A file difference tool is useful when you need to compare code, configuration files, JSON responses, XML settings, CSV exports, log files, or documentation. Instead of reading both files from top to bottom, the tool highlights the exact areas that changed. The code difference checker also highlights changes within individual lines, making small differences such as an added variable, changed number, missing comma, or edited word easier to spot.
How the Compare Result Works
The left side shows the original file or text, while the right side shows the updated version. When a line appears only on the right, it is marked as an added line. When a line appears only on the left, it is marked as a removed line. If both sides contain a line but the content is different, the row is marked as changed and the differences within the line are highlighted. This makes the file comparison view useful for code reviews, content reviews, and text proofreading.
The word summary option provides a simpler view of added and removed word occurrences. Use line comparison when checking source code, JSON, XML, CSS, HTML, SQL, CSV, or log files. Use word summary when you need a quick text difference check for paragraphs, notes, article edits, product descriptions, or short documentation changes.
Useful use cases
- Compare old and new source code before pasting it into a project.
- Check code difference in JavaScript, CSS, HTML, SQL, PHP, Python, Java, TypeScript or similar text-based files.
- Review JSON difference after changing an API response, app setting or package configuration.
- Compare XML difference for sitemap, feed, app configuration or markup changes.
- Check CSV file difference after exporting data from a spreadsheet or admin panel.
- Compare two log files to identify newly added errors or missing entries.
- Review article, policy, invoice template or documentation changes before publishing.
Common mistakes while comparing files
One common mistake is comparing formatted and minified files together. For example, a minified JSON file and a pretty JSON file may contain the same data but appear very different because line breaks and spacing changed. If you are comparing JSON, format both versions first with the JSON Formatter, then come back to this file diff checker. The same idea applies to XML, HTML and CSS: cleaner formatting usually gives a more readable difference result.
Another mistake is ignoring small punctuation changes. In code, a missing comma, bracket, quote, semicolon or minus sign can change behavior. In CSV files, one extra comma can shift columns. In configuration files, one changed value can affect a full application. Always read the highlighted code difference carefully before using the changed file in a live project.
Privacy and file handling
This page is designed as a browser utility for text-based comparison. The comparison runs on the page after you paste or select text files. Do not use confidential production secrets, private keys, passwords, customer records or sensitive company files on a shared computer. For very sensitive code or private business documents, use your approved internal tools and follow your organization rules.
Limitations
This file compare tool is made for text files and code snippets. It is not designed for binary files such as images, videos, compressed archives, Word documents or PDFs. Very large files may be limited by browser memory and device speed. The comparison is line-focused, so moved blocks can appear as removed and added instead of being recognized as one moved section. For complex software repositories, a full developer diff tool or version control system may still be better.