Debugify | 70+ Vanilla Bug Fixes in One Mod

If you play long-running survival worlds, you already know the small vanilla bugs that never seem to get fixed. Mobs nudging through fences, tooltips running off the screen, your XP bar vanishing once your level climbs high enough. Debugify was built for exactly this kind of player. It patches more than 70 issues straight from Mojang's bug tracker and adds nothing else, no new blocks, items, or mechanics. With roughly 39 million downloads, it has become a quiet standard in a huge share of modpacks.

Over 70 Bug Fixes Straight From the Tracker

The whole appeal of Debugify is restraint. Every fix corresponds to a real ticket on the official Mojang bug tracker, and the project's GitHub page keeps a full patched list sorted into Basic and Gameplay categories, each split into client-side and server-side sections. Beyond those fixes, the game stays untouched.

On the client side, the patches clear out a pile of daily annoyances:

• Creative flight no longer slows down near ladders, vines, or scaffolding (MC-12829)
• Oversized item tooltips stop getting cut off at the screen edge (MC-26757)
• Mending no longer resets your block-breaking progress mid-swing (MC-176559)
• Your selected hotbar slot survives respawning instead of snapping back to the first (MC-143474)
• The XP bar stays visible at very high levels (MC-79545)
• No more flickering invisible while flying fast (MC-111516)
• Chat on Linux opens without a stray letter typed into it (MC-122477)

Debugify also folds in the work of a whole shelf of standalone fix mods, among them ToolTipFix, No Telemetry, Skeleton Aiming Fix, Shift-Scroll Fix, ForgetMeChunk, and ChunkSavingFix. Those are not hard conflicts, so you can keep them installed for their extra features if you want.

Server-Side Fixes That Protect Your World

Plenty of the patched tickets matter most on servers. The highlights:

• Mobs escaping fences or suffocating in walls when chunks load (MC-2025)
• Pistons forgetting block updates after a reload, leaving stuck or floating blocks behind (MC-89146)
• 2x2 sapling trees refusing to grow when blocks sit against their north or west side (MC-8187)
• The ender dragon plunging into the void once its exit portal is destroyed (MC-88371)

There is also a proper telemetry toggle (MC-237493), something vanilla never gave you. Every server fix applies on the client too, so installing the mod on both ends of a multiplayer world gets you the complete set.

Performance Fixes Hiding in the Bug List

A few entries are effectively optimizations. Entity collision used to run on the render thread, and patching that turns into a real FPS gain around crowded mob farms (MC-228976). Another fix kills the lag spikes some players hit when crossing certain chunk borders (MC-162253). A third stops beacon beams and structure blocks from being rendered twice every frame (MC-112730). None of these need setup, they simply apply once the mod is in. If you want to stack more raw FPS on top, our BadOptimizations write-up covers micro-optimizations that pair nicely with this approach.

Config Screen, Toggles, and Modpack Settings

Every fix gets its own switch. With Mod Menu installed, you can open Debugify's config screen straight from the mod list and toggle anything you do not want. Prefer editing files? The config lives at .minecraft/config/debugify.json, one entry per bug.

Modpack authors get a feature of their own. A config option defaults newly added fixes to off until you review them, so an update never silently changes gameplay for your players overnight. For long-term packs, that single switch saves hours of changelog archaeology. One patch ships disabled out of the box, the macOS Ctrl+Q fix (MC-22882), so turn it on yourself if that shortcut matters to you.

How to Install Debugify

Debugify ships for Fabric, Forge, and Quilt, and installation is the usual jar drop.

1. Install a mod loader first. Starting from zero? Our how to install Minecraft mods guide covers every loader, with dedicated walkthroughs for Fabric and Forge.
2. Download the Debugify jar for your loader from the official project page. The download table on this page lists live files, so pick the build that matches your setup.
3. Drop the jar into your mods folder. On Windows that folder sits at %appdata%.minecraft\mods, and most Linux setups keep it inside .minecraft.
4. Launch the game once to confirm everything loads. If Mod Menu is installed, Debugify appears in the mod list with its settings one click away.
5. Modpack makers, open the config and enable the option that keeps new bug fixes off by default until you review them.

Debugify FAQ

Does Debugify need to be on both client and server?

It includes fixes for both sides, and every server-side fix also applies to the client. Either side can run it alone, but a multiplayer world only gets the full patch set when the server and every player install it.

Can I turn off specific bug fixes?

Yes, every fix is an individual toggle. Use the config screen through Mod Menu or edit .minecraft/config/debugify.json directly. The macOS Ctrl+Q fix (MC-22882) ships disabled, so enable it manually if you want it.

Does Debugify conflict with other mods?

The mods it replaces, like ToolTipFix and No Telemetry, are not hard conflicts and can run alongside it for their extra features. Occasional crashes with specific optimization and chat mods have been reported on the project's GitHub issue tracker, so keep both sides updated if something breaks. One fix (MC-199467) alters a math lookup table and has been reported to trip strict anticheats such as Grim. The developer acknowledged the report and planned a correction, so server owners running strict movement checks may prefer to toggle that single fix off.

Is Debugify still maintained?

Yes. The project is actively updated, with its latest release shipping in September 2026, and it sits at roughly 39 million downloads.

Debugify is the rare mod that makes Minecraft feel more like itself, just without the rough edges Mojang never smoothed out. If you are assembling a clean, fast client around it, our ModernFix breakdown is the natural next read.