Before-and-After Logos: How to Evaluate a Redesign

Before you start

A useful before/after logo review needs two images you can align. Prepare the old and new versions as PNG or SVG files with the same background color if possible. Keep the original files available so you can return to them after testing. The comparison described here runs locally in your browser: choose files from your device, let the page open them, and do not send image bytes to a server.

For SVG uploads, make sure the preview process treats them as untrusted graphics. Avoid files containing scripts, external requests, or unsafe embedded content; a clean export from your design tool is safer. For PNG, use a reasonably sharp export at the intended display size. A blurry or oversized image makes the visual comparison less reliable.

Step-by-step instructions

Open a logo comparison tool that accepts local PNG or SVG uploads. In a before/after slider, load the old logo as the before image and the new logo as the after image. Position both versions in the same part of the frame so the divider passes through the same visual area.

• Choose the old logo for the before side.
• Choose the new logo for the after side.
• Align the images so shapes, letters, or symbol edges are not accidentally cropped.
• Move the divider slowly to compare structure rather than switching rapidly.
• Repeat the comparison on a light background and on a dark background when the logo may be used both ways.

Check the output

Look for differences that survive at small size. Zoom out or resize the preview so the logo appears roughly as it would in a browser tab or app icon. Check whether the main shape, wordmark, spacing, and color contrast remain recognizable. If the new version loses legibility at small sizes, record that as a quality limitation rather than assuming the export is wrong.

Verify that the exported result uses the format you selected. For a slider comparison, the output is usually a screenshot or side-by-side image. If you use a tool that exports PNG, check that transparency is preserved when needed and that the file opens without errors. For SVG, open the exported file as plain text only if you need to inspect it; otherwise use a browser or design viewer.

Common problems and next steps

A common issue is mismatched backgrounds. The before logo on white next to the after logo on transparent may look like a color change even when the palette is identical. Use the same background for both sides or place both versions on a neutral preview surface. If the divider appears to cut through key detail, adjust the image position or use a wider preview area.

Another issue appears when an old raster logo is compared with a new vector file. The raster version may soften or lose detail at larger sizes. That is a property of the source image, not proof that the redesign failed. For the most useful comparison, export both versions at a similar resolution and view them at the same scale. If the tool cannot open a file, check the format and whether the file contains unsupported embedded content, then try a clean PNG export.

If the result seems too detailed to judge, make a separate review pass for each factor: silhouette, wordmark, color, spacing, and small-size behavior. Do not treat a redesigned logo as finished only because it looks better in one large mockup. Test the same after image in the smallest common use case, such as a favicon or app icon, before deciding whether the direction works.