Before/After Image Sliders for Portfolios and Renovations

ToolComb's Before/After Image Slider builds the comparison in the browser. This guide covers shooting, alignment, export, and embed - plus when to walk away and use static side-by-side photos instead.

Tool routing for sibling editors: Best free screenshot and mockup tools.

When a slider helps vs hurts

Good fits:

• Kitchen/bath remodel from a fixed corner.
• Lawn restoration or paint color on the same wall plane.
• Photo retouching demos where pixel alignment is tight.
• Dental or medical marketing where regulations allow comparison imagery.

Poor fits:

• Handheld phone photos from different heights.
• Wide-angle vs telephoto mixes.
• Lighting that changed the room color temperature dramatically - viewers assume the slider lies.

If alignment fails, a honest two-up collage from Collage Maker beats a slider that shears cabinets.

Capture discipline

Use a tripod mark on the floor for multi-week renovations. Phone users: enable grid lines, match eye level, lock exposure if the app allows.

Shoot before at the same time of day as after when windows dominate the frame - otherwise sun angle sells a fake "upgrade."

Export matching orientation and similar resolution. Downscale the larger file before upload so the tool handles both layers evenly.

Build the slider

Open Before/After Image Slider.

1. Load before as the base layer (convention, not law - stay consistent across your site).
2. Load after as the top layer.
3. Adjust position offsets until edges that should coincide (ceiling line, cabinet top) line up at the handle midpoint.
4. Set labels if the UI exposes them - "Before" / "After" helps accessibility more than mystery dividers.
5. Export or copy embed code your CMS accepts (iframe, HTML block, or hosted asset - follow what the tool outputs).

Processing stays local. Large 40 MP RAW exports may choke the tab; export JPG sRGB from Lightroom first.

Portfolio and CMS placement

Squarespace / Webflow / WordPress - paste embed HTML in a custom block or use the exported static image with a client-side slider script if your theme provides one.

GitHub Pages - prefer a static export or documented iframe src you control; ad-hoc script tags may be stripped.

Client deliverables - send PNG/GIF or a hosted link; confirm licensing if faces appear.

Always compress heavy exports before production deploy - How to compress images for the web.

Optional: cutout then compare

Product retouchers sometimes key the subject onto white before/after to hide messy studio changes. ToolComb's Image Background Remover works on flat or green backdrops only. Verify alpha with Transparent PNG Checker. Limits: Simple background removal limits.

Do not promise salon-quality hair masks from chroma key; use the slider on full-frame aligned photos instead.

Accessibility and ethics

Sliders hide half the image by default. Provide alt text on static fallbacks or describe both states in caption copy.

Medical and cosmetic comparisons may need disclaimers and regional rules - the tool does not supply legal copy.

What the slider will not do

• Perspective correction between mismatched shots.
• Automatic alignment from EXIF - you eyeball it.
• Video morph transitions.
• Batch fifty room jobs overnight.

Browser memory caps very large layers; desktop resize first.

Privacy

Renovation photos often include family clutter, addresses on mail, and license plates through windows. Local composition avoids a cloud "before/after SaaS" holding copies. You still choose whether the published embed is public - the tool does not password-protect your site.

Align the shots honestly, build the slider locally, compress for the web, and embed once the comparison survives the drag test without sliding off the ceiling line.