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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Before & after screenshot comparison
Compare screenshots and see exactly what changed.
Compare website screenshots with a reveal slider, side-by-side view and visual difference detection. Built for QA testing, design review, visual regression checks and client approval, with screenshot processing designed to stay local.
Before / After Comparison2 captures
RevealSide by SideDifferencesSwap
Local comparison
No screenshot upload required
No screenshot upload required
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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
Compare pixels locally, filter minor rendering noise, cluster meaningful changed regions and number the areas that deserve attention.
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.
⌂
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.
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Screenshot comparison FAQ
Common questions about before, after and visual differences.
How do I compare two website screenshots?+
Capture an earlier version and a newer version, then open the comparison workspace and choose Reveal, Side by Side or Differences.
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. Differences mode compares pixels locally, ignores minor rendering noise, clusters meaningful changes into regions and highlights them on the After screenshot.
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?+
Normal comparison and difference processing are designed to stay on your computer. Account and subscription communication is separate from screenshot image processing.
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