Showing the impact of an edit — a background removal, a color correction, a renovation — is much more convincing as an interactive slider than as two separate static images side by side.
This guide covers how to compare two images side by side for free using an interactive drag slider.
Key Takeaway: This tool is built for interactive viewing in the browser, not for exporting a flattened image — if you need a shareable static graphic, a collage layout is the better tool for that job.
When an Interactive Slider Beats a Static Side-by-Side
- Editing portfolios — letting a viewer drag the divider themselves is more engaging than a fixed split image
- Before/after demos — renovations, photo edits, weight loss progress, design revisions
- Quality comparisons — compression results, filter effects, upscaling output
Tip: Use two images with similar dimensions and framing — the comparison reads much more clearly when the subject lines up in roughly the same position in both images.
Step by Step: How to Compare Two Images
TinyPNG Now includes a free before/after comparison tool that runs entirely in your browser.
- Open the Before/After tool and upload your Before image.
- Upload your After image into the second upload box.
- Click Start Comparison to load the interactive slider.
- Drag the divider left and right (or swipe on mobile) to compare.
How to Make a Comparison That Actually Convinces
A slider is only as persuasive as the two images behind it. These habits make the difference obvious without any extra editing:
- Match the framing. Same distance, same angle, same crop. If the two shots are misaligned, the viewer notices the shift instead of the change. The Crop tool can trim both images to the same ratio first.
- Match the lighting and exposure. A brighter "after" photo can look like an improvement even when nothing changed. Compare like with like.
- Keep the edit honest. Do not alter the "after" image beyond the change you are demonstrating, especially for renovations, products or results people will act on.
- Order matters. Put the original on the left and the result on the right. Most viewers read left to right, so the story runs from problem to outcome.
- Use sufficient resolution. Fine detail disappears on a small image, so start from the largest versions you have.
Because the slider is for viewing in the browser, plan the page or post around that. If you need a static graphic for social media, build a side-by-side layout in the Collage Maker instead.
Frequently Asked Questions
Is the before/after comparison tool free?
Yes, completely free with no signup and unlimited comparisons.
Can I download or save the comparison?
This tool is for interactive viewing in your browser only — it doesn't export a combined image. Use a collage layout in the Collage Maker instead to create a shareable graphic.
Do the two images need to be the same size?
No, but for the cleanest comparison, images with similar dimensions and aspect ratios line up best.
Does it work on mobile?
Yes. The slider responds to touch swipes on mobile devices just as it does to mouse dragging on desktop.
Are my images uploaded to a server?
No. Both images are loaded and compared entirely in your browser. Nothing is uploaded anywhere.
Summary: Open the free TinyPNG Now before/after tool, upload both images, drag the divider — free, private, and instant.
Ready to compare two images?
Free, private, and instant — no signup required.
Try the Before/After Tool →