Before/After Sliders that show the transformation.

A static side-by-side photo shows a transformation, while a drag-to-reveal slider lets the visitor compare the two states directly. Use it when the difference between before and after matters more than either image alone. For service businesses selling transformations, place the slider where visitors are already evaluating proof of work, then test the page with your own analytics instead of assuming a specific engagement lift.

The Poper before/after slider ships five layouts, and the right choice depends on the kind of transformation you are showing. Classic split is the standard before/after comparison: a crisp vertical divider with a bold drag handle, and it is the right default for room renovations, photo retouches, and website redesigns. Glass Focus uses a frosted-glass control with a thin minimal line, which suits a clean, understated portfolio. X-Ray draws an emerald scan line and reveals the second image as the visitor hovers, which works well for dramatic reveals. Flashlight lets the visitor move a circular light to uncover the before image beneath, a playful interaction for event displays and product reveals; you can size the reveal circle. The Vertical layout swaps the divider to a handle that slides up and down, which is the right choice for full-body fitness transformations and tall portrait shots where a left-to-right wipe would feel wrong. Classic and Glass Focus also let you switch between horizontal and vertical orientation directly, so you are not locked into the layout's default. Pick the layout that matches both your imagery and the surrounding page rather than the most eye-catching one.

Before/after sliders need to be tested on mobile because real image size, page layout, and device performance all affect the feel of the drag interaction. Single-finger drag wipes the slider, and responsive sizing helps it fit the column it sits in. For the best mobile result, upload two images at the same aspect ratio so the comparison lines up pixel for pixel, keep the files reasonably sized, and test on the phones your visitors actually use.

Before/after content is one of the most-shared formats on Instagram, TikTok, Pinterest, and Facebook, because a transformation tells a complete story in two frames. The slider itself lives on your website, so the way to carry that shareability to social is on your side rather than the widget's. Set a strong Open Graph image for the page the slider sits on, ideally a static side-by-side composite of the before and after, so that when someone pastes your URL into a social post the preview shows the transformation rather than a generic page thumbnail. Give the page a clear, descriptive title and URL so the link reads well when shared. And when you post the transformation natively on social, link back to the page where the interactive slider lives so curious viewers can drag it themselves. The widget's job is to make the on-site experience compelling; pairing it with good page-level Open Graph tags is what makes the shared link look as good as the slider does.

When the transformation is a human body, face, or dental result, you have additional legal and ethical obligations beyond the standard portfolio embed. Informed consent: the patient must have signed a release that explicitly authorizes use of their before/after images on your public website (a generic photo release is not enough; the consent must reference web display). Identifiability: cosmetic surgery and dermatology images often include identifying features (eye color, hair, jewelry) even when the face is partially cropped; consider whether your consent form covers identifiability or only the treatment area. Watermarking: many jurisdictions allow you to watermark patient images with your practice logo as both copyright protection and a deterrent against patients re-uploading them in misleading contexts; if you want a watermark, add it to the image file before you upload it. HIPAA: in the US, before/after images of identifiable patients are protected health information, and you should confirm your own hosting and compliance posture covers them. GDPR: in the EU, before/after images of identifiable people require an explicit lawful basis for processing under Article 6 and may also fall under Article 9 (special category data) for medical and biometric information. The slider widget itself does not add these protections; it is your responsibility to ensure your consent flow, watermarking policy, and hosting choice meet your regulatory environment. Compared to static side-by-side images, sliders carry the same legal weight; the interactivity does not change the consent calculus.