How to Take Before and After Photos That Actually Compare

A before and after comparison is only convincing when the only thing that changes between the two photos is the result. Move the light, the camera or the subject, and the viewer can’t tell your work apart from the difference in the photo.

This guide covers the habits that make two photos comparable. They apply to a skincare treatment, a tattoo cover-up, a room renovation or a product test, and they matter most when you put the photos in a slider, where every mismatch shows up right under the handle.

The one-minute checklist

Before you take the “before” photo, decide and write down:

• Where the photo is taken (the same spot, ideally marked on the floor)
• What light you use (a window at a set time of day, or one lamp)
• How far the camera is from the subject, and at what height
• Which camera and lens (the same phone, the same 1× lens)
• What the subject wears or how it is arranged

Then repeat all five for the “after” photo. Most bad comparisons fail on one of these, usually light.

1. Light: the most important variable

Light changes colour, texture and shadow more than almost anything you are trying to show. A redness treatment can look finished, or a stain can disappear, just because the second photo was taken in brighter light.

• Use the same light source both times. Daylight from a window is soft and flattering, but it changes through the day and with the weather. For results taken weeks apart, a single fixed lamp or ring light is more reliable.
• Turn off mixed light. A ceiling bulb plus a window gives two colours of light, which a phone balances differently each time.
• Avoid the flash for skin and textures. It flattens detail and causes glare on oily or glossy surfaces.
• Shoot at the same time of day if you rely on daylight, and note it with the photo.

2. Position and angle

The camera has to be in the same place relative to the subject.

• Mark the spot. A piece of tape on the floor for the subject and another for the tripod (or your feet) makes repeat photos far easier.
• Fix the height. Shoot at the subject’s eye level for faces and at the centre height of a room for interiors. A camera a few centimetres higher changes how a face or a wall looks.
• Keep the head straight. For faces, ask the person to look into the lens with a neutral expression and hair pulled back. Take front and both side profiles if the change is on the cheeks or jawline.
• Use a tripod if you can. A cheap phone tripod removes most of the variation between sessions.

3. Distance and lens

Phones have several lenses, and they don’t show the same shape. The wide lens makes noses and corners look bigger the closer you get.

• Use the main 1× lens, or 2× for faces, and never switch between sessions.
• Stand at the same distance. Zooming in later doesn’t fix a different distance, because the perspective has already changed.
• Turn off portrait mode and any beauty, skin-smoothing or “enhance” filters. Some phones apply these by default in the front camera.

4. Camera settings

Automatic settings are fine for most people as long as they behave the same way both times:

• Lock focus and exposure by long-pressing on the subject (on most phones) before taking the shot.
• Keep HDR the same both times, on or off. HDR can lift shadows that hide texture.
• Use the highest resolution. The comparison tool doesn’t recompress your files, so the detail you capture is the detail people see when they zoom in.

5. Background and subject

• Use a plain, neutral background for people and products, such as a white or grey wall.
• Remove makeup and jewellery for skin photos, or wear exactly the same in both.
• Keep clothing the same colour. Coloured clothing reflects onto skin and changes its tone.
• For rooms, open the same curtains, turn on the same lamps and put furniture back in the same place where the change isn’t the furniture itself.

6. Editing: match, don’t improve

If you edit, apply exactly the same edit to both photos:

• Crop both to the same size and framing. The slider compares the images in the same frame; a different crop shows up as a jump.
• Apply the same exposure or colour correction, ideally as a saved preset in your editor.
• Never retouch only the “after”. It is misleading, and in advertising it can break consumer protection rules.

Check your pair before publishing

Put the two photos in the comparison tool before you share them. The preview runs in your browser and nothing is uploaded until you press Publish. Then:

• Drag the slider slowly across the subject. Edges that jump mean the framing or position is off.
• Switch to the Toggle view and flick between the photos. Changes in brightness or colour stand out immediately.
• Try the Difference view. Everything that changed lights up, including things you didn’t mean to change, like a shifted shadow. Read more in how to compare two images for differences.

Labels and consent

• Label each side with something meaningful: “Week 0” and “Week 8” says more than “Before” and “After”.
• Get written consent before publishing anyone’s face or body, and tell them where the photos will appear.
• Keep the originals. If a result is ever questioned, the untouched files are your proof.

Field-specific tips

• Skincare and aesthetics: front, left and right profiles, same time of day, clean skin, no makeup. See skincare sliders.
• Tattoos and cover-ups: photograph healed work, not fresh ink, which is red and swollen for days. See tattoo sliders.
• Interiors and renovations: shoot from a corner at chest height with the wide lens, and use that same lens every time. See interior sliders.
• Products and cleaning: a fixed lamp and a marked spot on the table beat any amount of editing. See handmade soap sliders.

Consistent photos take a few extra minutes and make every comparison more believable, whether it ends up in a slider, a carousel or a short video.