File Diff
This page takes two files as they are without asking what kind they are meant to be, and compares their text — which is the case you need when an upload is rejected and nothing looks different on screen. Read the result side by side, or as one unified list of changed lines when you intend to paste it somewhere.
Drop file here or click to upload
Supports text files up to 1024MB
Drop file here or click to upload
Supports text files up to 1024MB
Preguntas frecuentes sobre calculadoras en línea
Can I compare binary files?
No. The comparison reads text, so a ZIP, an image or a compiled file has no line structure worth diffing and its result carries no meaning. Two files that share a text format is what this is for.
Why choose unified over side by side?
Side by side is easier to read while both files hold a lot of context; unified is shorter and pastes cleanly into a ticket or a review comment because each change is one block.
Will my original file be changed?
The result is downloaded as a separate file. Keep your original until you have checked the Side-by-side or unified file diff.
What should I check before using the result?
Open the Side-by-side or unified file diff in the application that consumes it and spot-check the parts that matter to you; the original file stays untouched if you need to re-run with different options.
Is File Diff free?
Yes. This tool is free with no trial limit, subscription, or watermark. Use it for personal and commercial projects without an account.
Are my files uploaded to your servers?
Comparison runs locally in your browser for supported formats. Your files and text stay on your device and are not stored on FileCompare servers.
What Is File Diff?
FileCompare.org provides a free online tool for side-by-side file and code differences directly in your browser.
When you need to spot changes quickly, a side-by-side diff beats manual scrolling. Paste content into both panels or upload text files, source code, logs, and data exports, then review highlighted additions, deletions, and edits in one view.
Also known as a file diff tool, compare files online, online diff checker, this page is built for developers, writers, analysts, and QA teams who need accurate diffs without installing desktop software. Processing runs locally in your browser whenever the format allows, which keeps sensitive data off third-party servers.
How to Use File Diff Online
- Open the tool — No registration is required.
- Add the original — Paste or upload the first version in the left panel. Supported inputs include text files, source code, logs, and data exports.
- Add the modified version — Paste or upload the second version in the right panel.
- Choose options — Use the case, whitespace, formatting, key-order, or format-specific settings shown on this page when available.
- Review the diff — Inspect highlighted changes in the results area.
- Copy or export — Save the comparison output for tickets, pull requests, or audit logs.
Tip: If this page offers sample data, load it first to see how the comparison behaves before working with your own files.
Key Features of File Diff
- Side-by-side diff — Clear view of side-by-side file and code differences with color-coded additions and deletions.
- Multiple input methods — Paste text, upload files, and swap panels where supported.
- Format-aware — Handles text files, source code, logs, and data exports with sensible defaults.
- Privacy-first — Browser-side processing; no server upload for supported formats.
- Free and unlimited — No account, watermark, or export cap for normal use.
- Cross-platform — Works on Chrome, Firefox, Safari, and Edge on desktop and mobile.
- No installation — Web-based diff checker; open the page and compare immediately.
Zero Data Retention — Compare Securely in Your Browser
FileCompare.org runs supported comparisons in your browser: your files and pasted text stay on your device. Nothing is uploaded, stored, or logged on our servers for browser-side formats.
That matters when you diff contracts, API keys, customer data, or unreleased code. You get instant side-by-side results without sending content over the network.
Common Use Cases
Teams choose an online diff when they need side-by-side file and code differences without a heavy IDE or desktop suite. Typical scenarios include:
- Generic code and text file diff
- Backup verification
- Merge conflict review
- Log file comparison
Because the tool is web-based, remote collaborators can share the same workflow from any location—useful for agencies, open-source maintainers, and distributed QA teams.
Tips for Best Results
Keep originals until you confirm the diff—re-export from source rather than diffing twice-compressed files.
When a portal or pipeline rejects your file, compare its encoding, line endings, and size limits with your source, adjust settings, and run the diff again.
Bookmark this page for repeat jobs—controls stay visible between uploads, which speeds up daily review cycles.
Related Workflows
If you are checking version control diff, merge conflict review, backup file comparison, this file diff page keeps the comparison focused on the relevant format and workflow. Use the related tools in the navigation when the input changes from text to structured data, lists, documents, or images.