How many images can I compare?

Two images side-by-side or in a slider view.

What comparison modes are supported?

Side-by-side, slider (drag to reveal), and overlay.

Is my image uploaded to a server?

No. All processing happens locally.

Image Compare — Side-by-Side & Slider Free

1. Télécharger Images

📤

Before / Image A

📤

After / Image B

🖼️ Try with a sample image

🖼️ Try sample A 🖼️ Try sample B

2. Comparison Mode

Télécharger two images to start comparing

How to Use

Upload Both Images

Click each upload area to add Image A and Image B.

Choose Mode

Slider, Side-by-Side, or Overlay — pick what works best.

Compare

Drag the slider or adjust overlay opacity to compare.

Download

Save the comparison as a single combined image.

Detailed User Guide

Step 1: Upload Both Images

Click the Before / Image A area to upload your first image, then click After / Image B for the second. Supported formats: JPG, PNG, WebP, GIF, BMP. Both images load instantly in your browser.

Step 2: Choose Comparison Mode

Three powerful comparison modes:

Slider: Drag the vertical slider to reveal the before/after. Best for compression comparisons and retouching before/after.
Side by Side: Both images displayed next to each other. Best for quick visual comparison.
Overlay: Image B overlaid on Image A with adjustable opacity. Use the slider to control transparency. Best for spotting subtle differences.

Step 3: Interact & Compare

In Slider mode, drag the blue vertical bar left and right. In Overlay mode, use the opacity slider. In Side by Side mode, scroll to see both images fully.

Step 4: Download

Click Download Comparison to save a combined image (side-by-side layout) as PNG. This is useful for sharing comparison results.

Best Use Cases

Compression quality: Compare original vs. compressed image to check quality loss
Before/after editing: Show the result of photo retouching or filters
Design iterations: Compare two design versions side by side
Image upscaling: Compare low-res original vs. upscaled result
Background removal: Compare original vs. background-removed result

Pro Tips

Use Slider mode for compression comparisons — it makes quality differences immediately visible
For subtle differences, use Overlay mode with opacity around 50%
Side-by-Side mode is best when both images have very different compositions
For sharing, download the comparison and post it directly to social media
Use this tool after using our Compressor to visually verify quality before/after

Frequently Asked Questions

No. All image loading and comparison happens entirely in your browser. Your images never leave your device.

The Slider mode is best — drag the slider slowly across details to see exactly where quality was lost during compression.

Yes, but for the best experience, the images are displayed at their natural size. In Slider and Overlay modes, Image B is scaled to match Image A's dimensions.

Yes, click "Download Comparison" to save a side-by-side PNG of both images. This is useful for sharing or documenting before/after results.

We support JPG, PNG, WebP, GIF, and BMP for input. The downloaded comparison is always PNG format.

There is no hard limit, but very large images (over 5000px wide) may be slow to render. For best performance, resize large images before comparing.

Absolutely. The output images are yours to use for any purpose — personal or commercial.

📊 Image Compare