Private browser-based diff checker

Compare Files Online Free

Q: How can I compare two files online?

Upload or drag File A and File B 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. The MVP 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 File A Drag and drop or browse No file selected Upload File B Drag and drop or browse No file selected

File A content File B content

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

No changes yet

File A File B

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 File A and File B, 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.

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.