Before/After Slider online — free

Why use this tool?

• Local image processing
• Preview before download
• No sign-up

How it works

1. 1Open the Before/After Slider page — no registration required.
2. 2Upload or drag your file into the drop zone.
3. 3Adjust settings and review the live preview (local image processing).
4. 4Copy the output or download the processed file to your device.

Common use cases

• Resize or compress images before posting to the web or chat apps
• Prepare assets for slides, docs, or social posts on the go
• Test a filter or conversion without installing photo software
• Process screenshots and exports from other tools

Tips & comparisons

• Compared with desktop apps, this online before/after slider starts instantly and needs no updates — bookmark it for repeat tasks.
• Cloud upload services may store copies of your files; this browser tool keeps processing local when the feature allows it.
• For batch or enterprise workflows, combine this tool with Tentaco studios or export results to your own pipeline.

Privacy & data handling

Tentaco runs this tool in your browser whenever possible. Files you select are processed in memory on your device and are not uploaded to Tentaco servers for standard modes. Close the tab or clear the page after use on shared computers. Features that call external APIs (such as URL fetchers) only send the data required for that request.