Private browser-based diff checker

Compare Files Online Free

Q: How can I compare two files online?

Upload or drag the original file and changed file into FileDiffChecker.com, then select Compare Files. The browser shows a side-by-side diff with additions, removals, and modified lines.

Q: Is this file comparison tool free?

Yes. FileDiffChecker.com is a free file diff checker and does not require an account.

Q: Are my files uploaded to the server?

No. FileDiffChecker.com processes file content locally in your browser for privacy.

Q: Can I compare JSON files?

Yes. You can compare JSON files online and optionally format valid JSON before comparing.

Q: Can I compare source code files?

Yes. FileDiffChecker.com supports common code files including JavaScript, TypeScript, Python, Java, HTML, and CSS.

Use FileDiffChecker.com to compare two files online instantly. Find added, removed, and modified content in TXT, JSON, CSV, XML, and source code files without signup.

Compare files now View supported formats

1  import data
2  const status = "old"
3  render(items)

1  import data
2  const status = "new"
3  render(items)
4  export report

File comparison tool

Upload two files and compare differences instantly

Everything runs locally in your browser, so your files stay on your device.

Upload Original File Drag and drop or browse No file selected Upload Changed File Drag and drop or browse No file selected

Original file content Changed file content

Total changes: 0 Added: 0 Removed: 0 Modified: 0 Unchanged: 0

No changes yet

Original file Changed file

Upload two files or paste content above, then select Compare Files.

Features

A fast online difference checker for everyday file reviews

Side-by-side diff

Compare two text files with aligned rows, line numbers, and color-coded changes.

Local processing

Review file differences without sending your content to a backend service.

Developer friendly

Use the online diff tool for JavaScript, TypeScript, Python, Java, HTML, and CSS.

Export results

Copy the comparison summary or download a simple report for sharing and documentation.

Supported formats

Compare TXT, JSON, CSV, XML, PHP, and source code files

FileDiffChecker.com is built for common document and developer workflows: compare two text files, validate changes in JSON, TOML, or YAML configuration, inspect CSV exports, review XML feeds, and check code edits in PHP, Python, JavaScript, TypeScript, Java, CSS, SQL, shell scripts, and more.

TXT JSON CSV XML Code

How it works

Three steps to compare files online

Add files

Upload the original file and changed file, drag them into the drop zones, or paste content manually.

Run comparison

Select Compare Files to generate an instant browser-based file diff checker result.

Review changes

Scan added, removed, modified, and unchanged lines with a clean side-by-side layout.

Comparison guidance

How to get clearer file difference results

For best results, compare files that use the same formatting style. If you compare JSON, format both files first so changed keys and values line up cleanly. For source code, compare the original version against the changed version to see additions in green and removed original content in red.

Original vs changed

Place the older or baseline file on the original side and the newer file on the changed side for easier review.

Config files

Compare TOML, YAML, JSON, INI, and environment files before deploying application settings.

Code reviews

Check PHP, Python, JavaScript, TypeScript, CSS, SQL, shell scripts, and other text-based source files.

Reports

Download a comparison report after reviewing changes so you can document what changed.

FAQ

FileDiffChecker.com questions

How can I compare two files online?

Upload two files or paste their contents into the comparison fields, then select Compare Files. FileDiffChecker.com highlights additions, removals, and modified lines.

Is this file comparison tool free?

Yes. You can compare files online free without creating an account.

Are my files uploaded to the server?

No. The comparison runs locally in your browser for privacy.

Can I compare JSON files?

Yes. You can compare JSON files online and use the Format JSON button to pretty-print valid JSON before comparing.

Can I compare source code files?

Yes. The tool supports common source code and config file extensions including .php, .py, .js, .ts, .java, .html, .css, .toml, .yaml, .sql, .sh, .go, .rs, .rb, and more.