Compare image
Two screenshots differ in ways that are awkward to state in words, so this page puts them together and lets you look: side by side on a split, one faded through the other, or reduced to a highlight of what moved. Both pictures stay on your device and the view you land on comes back as a downloadable result.
Upload two images to start comparison
Frequently Asked Questions About Online Calculators
Do the two images need the same dimensions?
For the overlay modes, yes — pixels are read in position, so a resized or shifted copy reads as a whole-image change. Align or crop the pair first if it is offset.
Can I adjust the images before comparing?
Zoom, brightness and contrast apply to the view, and each image can be rotated or flipped — useful when the two captures differ by an orientation rather than by content.
Will my original file be changed?
The result is downloaded as a separate file. Keep your original until you have checked the Visual difference overlay.
What should I check before using the result?
Open the Visual difference overlay 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.
How sensitive is the image diff?
The compare image highlights pixel-level changes. Use identical canvas sizes for UI screenshots to reduce false positives from scaling.
Is Compare Image free?
Yes. This tool is free with no trial limit, subscription, or watermark. Use it for personal and commercial projects without an account.
What Is Compare image?
Image compare overlays two screenshots or photos and highlights pixel differences. It is built for UI QA and before/after checks; transparent pixels, canvas size mismatches, and compression noise can create false positives unless you align dimensions first.
When you need to spot changes quickly, a side-by-side diff beats manual scrolling. Paste content into both panels or upload PNG, JPG, WEBP, GIF, and BMP images, then review highlighted additions, deletions, and edits in one view.
Also known as a image diff tool, compare images online, visual regression 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 Compare Image Online
- Open the tool — No registration is required.
- Add the original — Paste or upload the first version in the left panel. Supported inputs include PNG, JPG, WEBP, GIF, and BMP images.
- 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.
Image Diff Limits
- Same dimensions — Resize or crop to matching width/height before comparing UI screenshots.
- Transparent pixels — Alpha channel differences can light up entire regions even when the visible UI matches.
- Difference threshold — Compression and anti-aliasing create tiny pixel noise; expect some false positives on JPEG.
- Best for — PNG screenshots, design handoffs, and visual regression checks—not forensic photo analysis.
Key Features of Compare image
- Side-by-side diff — Clear view of pixel-level and visual image differences with color-coded additions and deletions.
- Multiple input methods — Paste text, upload files, and swap panels where supported.
- Format-aware — Handles PNG, JPG, WEBP, GIF, and BMP images 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 pixel-level and visual image differences without a heavy IDE or desktop suite. Typical scenarios include:
- Visual regression testing for UI
- Screenshot comparison in QA
- Photo retouch before/after review
- Asset version control
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
Match canvas size, watch transparent pixels, and treat JPEG compression noise as a difference threshold issue—prefer PNG for UI QA.
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 UI screenshot comparison, QA visual testing, photo before and after diff, this compare image 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.