<div class="ba-wrapper" id="baWrapper">
  <div class="ba-image-container">
    <img src="https://placehold.co/800x500/e2e8f0/1e293b?text=Original+Design" alt="Before" class="ba-img-base">
    <div class="ba-img-overlay">
      <img src="https://placehold.co/800x500/3b82f6/ffffff?text=New+Design" alt="After" class="ba-img-top">
    </div>
  </div>
  <div class="ba-handle">
    <svg viewBox="0 0 24 24" width="16" height="16" stroke="currentColor" stroke-width="3" fill="none" stroke-linecap="round" stroke-linejoin="round"><polyline points="15 18 9 12 15 6"></polyline></svg>
    <svg viewBox="0 0 24 24" width="16" height="16" stroke="currentColor" stroke-width="3" fill="none" stroke-linecap="round" stroke-linejoin="round"><polyline points="9 18 15 12 9 6"></polyline></svg>
  </div>
  <input type="range" min="0" max="100" value="50" class="ba-range" aria-label="Comparison Slider">
</div>

.ba-wrapper {
  --position: 50%;
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  position: relative;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.ba-image-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 62.5%; /* Aspect Ratio */
}
.ba-img-base {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ba-img-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--position);
  height: 100%;
  overflow: hidden;
  border-right: 2px solid #fff;
}
.ba-img-top {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  object-fit: cover;
  width: 100vw; /* Ensure image does not squish */
  max-width: 700px; /* Match container max-width */
}
.ba-range {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: ew-resize;
  z-index: 20;
  margin: 0;
}
.ba-handle {
  position: absolute;
  top: 50%;
  left: var(--position);
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1f2937;
  pointer-events: none;
}

const wrapper = document.getElementById("baWrapper");
const range = wrapper.querySelector(".ba-range");

range.addEventListener("input", function() {
  wrapper.style.setProperty("--position", `${this.value}%`);
});

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Before and After Image Slider JS

Show the difference between two images with this interactive comparison slider. It uses a simple range input to control the reveal, so it works perfectly on touch screens and desktops without heavy code.

367

#javascript

#css

#comparison

#slider

#before after

#image

#interactive

#ui

/HTML *CSS ()JS Output Live Updates

.ba-wrapper {
  --position: 50%;
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  position: relative;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
.ba-image-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 62.5%; /* Aspect Ratio */
}
.ba-img-base {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ba-img-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--position);
  height: 100%;
  overflow: hidden;
  border-right: 2px solid #fff;
}
.ba-img-top {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  object-fit: cover;
  width: 100vw; /* Ensure image does not squish */
  max-width: 700px; /* Match container max-width */
}
.ba-range {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: ew-resize;
  z-index: 20;
  margin: 0;
}
.ba-handle {
  position: absolute;
  top: 50%;
  left: var(--position);
  transform: translate(-50%, -50%);
  width: 44px;
  height: 44px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1f2937;
  pointer-events: none;
}