Custom Ren'Py Save Screen With Thumbnails And Delete

Problem: Custom Save Screen Without Thumbnails

Ren'Py's default save interface is functional but offers no preview thumbnails, forcing players to recognize saves by name alone. If you want a visual preview, the ability to delete slots, and a streamlined selection flow that stays inside your game, you need a custom screen built on Ren'Py's built-in save functions.

Useful Takeaway

By defining a single screen in screens.rpy and calling it with renpy.show_screen(), you can list all saves with thumbnails, let players load or delete slots, and keep the UI consistent with your game's style—all without external image processing.

Desired Outcome

A screen that enumerates every save slot, shows a preview thumbnail beside the filename, and provides Load Save and Delete actions. The thumbnails are generated by renpy.thumbnail() which reads the save file's associated image or creates a minimal preview.

Necessary Prerequisites

• Ren'Py 8.x or later: while renpy.thumbnail() works from 7.4, the full screen-management flow is best on 8.x.
• Basic Ren'Py script familiarity: comfort with screens.rpy and screen language syntax.
• An active game project: the screen modifies an existing save system.

Focused Procedure

1. Open your project's screens.rpy file in the project directory.
2. Define a screen named custom_save_screen using Ren'Py screen language. The screen will iterate over save entries, display thumbnails, and handle user actions.
3. Inside the screen, use renpy.list_saves() to retrieve the current save slots. This function returns a list of dictionaries, each containing at minimum a filename key that uniquely identifies the save.
4. For each save entry, call renpy.thumbnail(save.filename) to generate a preview image. The function embeds the thumbnail data directly into the screen, so no separate image files are required.
5. Display the thumbnail, the save's filename, and three action buttons: Load calls renpy.load(save.filename) to restore the game from that exact point. Delete shows a confirmation dialog then calls renpy.delete(save.filename) to remove the slot. Save invokes renpy.save() with a chosen slot name, creating a new save entry that will appear the next time the screen opens.
6. After the screen definition, invoke it from a menu label or game event using renpy.show_screen('custom_save_screen').

Expected Checks

• Launch the project via the Ren'Py launcher and open the custom save screen from a menu; the screen should appear populated with save entries.
• Create a new save from within the game, then verify that a thumbnail image displays next to the save name on the custom screen.
• Click the Load button on a save and confirm the game resumes from that exact point, preserving progress, music state, and variables.
• Click the Delete button, accept the confirmation prompt, and verify the save disappears from the list and its thumbnail is removed.
• Open the developer console (Shift+O) and scan for errors related to renpy.thumbnail, renpy.list_saves, or file-path mismatches. Absence of errors indicates the implementation is correct.

Comparison: Default vs Custom Save Screen

Recovery Options

If the custom screen fails to appear, comment out the custom_save_screen definition in screens.rpy and reload the game; the default Ren'Py save screen will load instead. For console errors, verify that every filename passed to renpy.load() or renpy.delete() matches the exact string returned by renpy.list_saves()—a common source of failures is truncating or modifying the filename.

Limitations and Practical Tips

• Version requirement: renpy.thumbnail() requires Ren'Py 7.4 or newer; older versions will not generate preview images.
• Active slot risk: saving or deleting a slot that is currently active may cause data loss. Always present a confirmation dialog before deleting.
• Filename matching: the filename from renpy.list_saves() must be forwarded verbatim to renpy.load() and renpy.delete(). Mismatched names produce errors in the console.
• Performance with many saves: displaying dozens of thumbnails can slow screen refresh. Consider paginating the list or capping the number of entries shown at once.