Reveal Slider
Drag across aligned Before and After screenshots to reveal the newer version over the older one. Useful for layout, spacing, typography and content changes.
Visual comparison focus: Use this page when your goal is to compare two screenshots and verify what changed. For viewport-specific capture, use Responsive Screenshots.
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Screenshot Q&A →
Before & after screenshot comparison · Pro
Compare screenshots and see exactly what changed.
Capture Pro compares saved website screenshots with Reveal Slider and Side by Side. Pixel Differences is available for reliably aligned captures of the same page. Use it for manual QA, design review and fix verification; normal comparison processing stays local.
Three ways to compare
Choose the view that makes the change easiest to see.
Capture keeps comparison simple for human review instead of forcing every job into a complex automated test pipeline.
Side by Side
Place the two versions next to each other for quick design review, stakeholder approval and clear documentation of what changed.
Differences
For aligned captures of the same page, compare pixels locally, adjust sensitivity, group changed regions and highlight areas to review. Different URLs can use compatible Reveal or Side by Side views instead.
Visual difference detection
Find changes your eyes can miss.
Small shifts in spacing, button position, cards, text blocks or responsive layout can be difficult to notice when you switch between tabs. Differences mode highlights changed regions on the full-resolution After screenshot and gives you a clear change count and approximate percentage.
✓Sensitivity control
✓Minor rendering-noise tolerance
✓Meaningful changed-region clustering
✓Changed-region count
✓Approximate percentage changed
✓Export Differences
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Where comparison helps
Useful for QA, design, deployment review and client sign-off.
Compare an earlier known-good capture against a new build after code, CSS or dependency changes.
Check whether an updated page visually matches the intended direction after design revisions.
Capture the same breakpoint before and after a mobile, tablet or desktop layout correction.
Create captures from two environments and inspect visible changes before release.
Show stakeholders exactly what changed without asking them to mentally compare two separate screenshots.
Keep the original visual defect and the corrected version together as evidence that the issue was addressed.
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Compare screenshots without sending them away.
Normal Before/After comparison and visual difference processing are designed to happen locally on your computer. Screenshot image content does not need to be uploaded to RATdeck for comparison.
Screenshot comparison and visual regression
Why compare screenshots instead of flipping between tabs?
A before-and-after screenshot comparison aligns two visual states so spacing, typography, layout and content changes are easier to spot. A reveal slider is useful when the two screenshots are closely aligned, while side-by-side comparison helps when reviewers need to understand the full context of both versions.
For QA and visual regression review, a difference view can surface areas that changed unexpectedly. Capture adds sensitivity control and meaningful-region grouping so reviewers can reduce minor rendering noise and focus on changes that deserve attention. Capture is designed for manual visual review and reporting; it is not presented as an automated CI/CD visual-regression platform.
Screenshot comparison FAQ
Common questions about before, after and visual differences.
How do I compare two website screenshots?+
With Pro, save an earlier and a newer capture, open Compare from the editor or History, and select Before and After. Read the compatibility notice. Reveal Slider and Side by Side support compatible pairs; Differences requires an aligned view of the same page.
What is a before and after screenshot slider?+
A reveal slider places two aligned screenshots in the same space and lets you drag a divider across them so you can see the earlier and newer version at the same location.
Can Capture automatically highlight screenshot differences?+
Yes, for compatible, pixel-aligned captures of the same page. Differences compares pixels locally, applies the chosen sensitivity, groups changed regions and highlights them on the After screenshot. A highlighted change is visual evidence, not an automatic judgment that the page is wrong.
Does Capture show how much changed?+
Yes. Differences mode includes a changed-region count and an approximate percentage changed.
Can I change the difference sensitivity?+
Yes. The sensitivity control lets you tune how aggressively small rendering differences are treated as meaningful changes.
Is this useful for visual regression testing?+
Yes for manual visual regression review, QA verification and design comparison. Capture does not currently claim to be an automated CI/CD visual-regression testing service.
Are before and after screenshots uploaded?+
Opening Compare, moving the slider and exporting locally do not upload screenshots. The optional Pro Share Link uploads the selected before/after frame only after you approve it. Anyone with the link can view it for seven days unless you revoke it sooner. Compare uses original captures, so inspect both images; blur or annotations in the editor do not automatically carry into a comparison link.
Why is Differences disabled when Reveal Slider works?+
Compatible captures from different URLs can be reviewed with Reveal Slider or Side by Side, but they do not share a reliable same-page pixel origin. For Differences, retake the same page with matching capture geometry, viewport and scale.
Do editor annotations and blur appear in Compare?+
Do not assume they do. Compare uses original saved capture images. Inspect both images in Compare itself. For a sanitized or annotated file, export from the editor and check that exact output before sharing.
Does one Share Link include every part of a long comparison?+
No. It uploads the Before and After images for the selected frame, plus a title, and creates a link that expires after seven days. Anyone with the link can view that frame. Read the sharing guide before uploading.
Can comparison replace automated visual tests?+
Capture is a manual capture-and-review workflow. It does not schedule website screenshots, run CI checks or decide whether a release passes. Use automated testing separately when you need repeatable checks across many pages or builds.
Capture by RATdeck
Stop guessing what changed.
Compare it.
Capture before and after website states, reveal visual differences and export clear evidence while keeping screenshot processing local.
Responsive & Visual Testing