Compare two photos with one draggable slider — free, in your browser. Your images never leave your browser.
What this tool does
Before-and-after photos prove a change, but only if viewers can compare them properly. Two separate photos force people to look back and forth, and small differences get lost. This before-after image compare slider puts both photos behind one draggable handle: drag left to reveal more of the before photo, drag right for more of the after photo, and the dividing line shows exactly where one ends and the other begins. Both images stay in your browser, and the comparison is built on a canvas with no upload.
The slider suits renovation projects, photo edits, cleaning results, fitness progress, design revisions, and product restorations. Any job where the change is the story benefits from a slider, because the viewer controls the comparison instead of guessing from two thumbnails. It also works for edits: show the original and the retouched version, and the slider reveals what the edit actually changed.
Why it is useful
Side-by-side photos fail when the two images are not aligned. Even a small shift in angle or size makes comparison confusing, and viewers blame the photos rather than the layout. A slider solves the alignment problem visually, because both photos occupy the same frame and only the dividing line moves. It also saves space: one slider replaces two images, which suits articles, listings, and portfolios. For sellers and professionals, a slider is more persuasive than a claim, because the viewer performs the comparison themselves.
How to use it
Comparing two photos is straightforward.
- Upload the before photo with the first file button.
- Upload the after photo with the second file button.
- Drag the handle on the image, or move the slider control, to compare.
- Download the current comparison view as a PNG if you need a still image.
A practical example
A cleaner photographs a kitchen before and after a deep clean. Viewers drag the slider across the stove and see grease vanish along the line, which is far more convincing than two separate photos. A photo editor shows a portrait before and after retouching, and the slider reveals that only skin blemishes changed, not the person’s features. A renovator shows a room before and after painting, and the slider lets clients compare the same corner at the same angle. In each case, the slider does the persuading.
Tips for good results
Take both photos from the same position, angle, and distance, or the comparison will mislead. Matching light helps too: a before photo in dim light and an after photo in bright light exaggerates the change. Use the same framing so the dividing line cuts through the same objects in both images. When the photos align well, the slider feels almost magical; when they do not, fix the photos first rather than blaming the tool.
Honest limits
The tool does not align photos automatically. If the before and after shots differ in angle or size, the slider will show that mismatch plainly, which is honest but not flattering. The comparison view is sized to the before photo’s shape, so a very different after photo will be stretched to fit, and that can distort it. Downloading saves only the current slider position as a still image, not an interactive slider, so for a web page you would need to embed the interactive version. The tool also cannot fix photos that were never meant to be compared.
Frequently asked questions
Is the compare slider free?
Yes, it runs in your browser with no account and no payment.
Do both photos need the same size?
No, but matching angle, framing, and light gives a far better comparison.
Can I download the comparison?
Yes, the download saves the current slider view as a PNG still image.
Are my photos uploaded?
No. Both images stay in your browser and nothing is sent to a server.
También disponible en español: Comparador Antes y Después de Fotos Gratis – Desliza y Compara.
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