File Difference Tool for Comparing Any Text Files
Instantly compare two text files side by side to see every addition and deletion highlighted. You can paste your original content on the left and the modified version on the right, or simply upload files from your computer. The diff result panel uses clear color-coding, marking additions in green, deletions in red, and unchanged lines in gray. With six specialized comparison modes, you can dive into granular character changes or step back for a high-level statistical overview. Since all processing happens locally in your browser, your files remain completely private.
File Difference
Line-by-line comparison using the Myers diff algorithm with color-coded additions, deletions, and unchanged lines.
Character Diff
Splits files into individual characters for granular comparison, catching typos and single-character edits.
Word Diff
Compares files word by word to pinpoint exactly which terms changed within each line of content.
Line Count Diff
Statistical comparison showing total lines, words, characters, and blank lines for both files with differences.
File Size Compare
Visual bar chart showing byte sizes of both files with absolute and percentage difference calculations.
Checksum Compare
SHA-256 hash comparison to verify whether two files contain exactly identical content.
Online File Difference Checker with Upload and Paste
You can load your files into the workspace in just a few seconds. Simply paste text into either panel, use the upload buttons in the toolbar, or drag and drop files directly into the interface. The tool supports any text-based format, including source code, CSV, JSON, XML, and plain text. Because the browser FileReader API reads your data locally, nothing is ever uploaded to a server. As soon as both panels have content, the comparison generates automatically with line numbers and clear change indicators.
Drag and Drop Files for Quick Comparison
When you drag a file onto the workspace, it automatically loads into the first empty panel. Dropping a second file fills the other side, creating a fast workflow that feels as natural as moving files in your explorer. You will see file names in the toolbar, making it easy to track which version sits on each side.
Filter Results by Change Type
Check the options bar for live statistics on every change type. You can click the filter buttons to isolate additions, deletions, or unchanged lines at any time. This helps you focus on what matters most when comparing large files, stripping away the noise to surface the specific changes you need to review.
Character, Word, and Statistical Comparisons
While line-by-line comparison works for most tasks, you might occasionally need more granular precision or a high-level overview. Character Diff analyzes files at the character level to reveal typos, whitespace shifts, or encoding issues that a standard line diff might miss. Alternatively, Word Diff splits content by whitespace to compare individual terms, which is perfect for reviewing prose in documentation or articles where wording is critical.
Line Count and File Size Statistics
Get a quick statistical snapshot with Line Count Diff, which tracks total lines, words, characters, and blank lines alongside a delta column. You can also use File Size Compare to see visual bar charts of byte sizes and calculate both absolute and percentage changes. These statistical views help you understand exactly how much a file has grown or shrunk without needing to read every single line.
SHA-256 Checksum Verification
Use Checksum Compare to generate SHA-256 hashes that definitively prove whether two files are identical. Because even a single byte change produces a completely different hash, this is the most reliable way to verify file integrity. It allows you to confirm your downloads or backups are correct without manually inspecting the content.
Free File Difference Checker for Developers and Writers
This tool provides instant results without any setup, whether you are a developer checking code changes, a writer tracking revisions, or an admin verifying updates. You have full access to every feature immediately, with no account requirements or usage limits. You can also export your results as plain text diff files that are compatible with any editor. Because all logic runs in client-side JavaScript, your files never leave your computer and the tool even works offline once loaded.
No Signup, No Limits, No Server Storage
From the moment you open the page, every comparison mode, filter, and export format is ready for use. You will not find any premium tiers, rate limits, or restrictions on file size here. Once you close your browser tab, all data is permanently cleared from your device memory.
Client-Side Processing for Complete Privacy
Every comparison algorithm, checksum calculation, and statistical report runs locally inside your browser. None of your files, contents, or metadata ever travel across the network. This ensures your data remains safe, making it ideal for comparing sensitive documents like contracts, source code, or confidential records.
Related File and Code Comparison Tools
If you compare files and documents regularly, these tools complement what you can do here:
- Character Diff -- compare files character by character to catch typos and encoding differences
- Word Diff -- compare files word by word for prose and documentation reviews
- Checksum Compare -- verify file integrity with SHA-256 hash comparison
- HTML Diff -- compare HTML documents with tag, attribute, and structure analysis
- JSON Diff -- compare two JSON files and generate patches
- JSON Formatter -- format and validate JSON data with syntax highlighting
- Text Compare -- compare plain text documents side by side
- CSV to JSON Converter -- convert spreadsheet exports to JSON format