Can I change the MINECRAFT logo to my own text?
Yes. The logo is a picture (textures/gui/title/minecraft.png), so a resource pack can replace it. Click the logo here and type: your words are drawn big in the game's own font, with the shadow the game gives its text, and written into the pack at the size the game reads. You can also upload your own picture instead. The Minecraft wordmark itself is Mojang's artwork, so this tool doesn't take it apart.
Can I change the red loading screen and its bar?
Only the logo on it. The red behind it and the white progress bar are drawn from numbers in the game's code (LoadingOverlay), not from a texture, so no resource pack can recolour them. The Mojang Studios logo itself is a texture and this tool can replace it.
Can I rename the buttons on the menu?
Yes — Singleplayer, Multiplayer, Minecraft Realms, Options..., Quit Game and the copyright line are all language keys (menu.singleplayer and friends), so the pack writes your words into assets/minecraft/lang. Because the game applies the player's own language after English, the pack writes the same words into every language file so everyone sees them; you can switch that to English only. The colour of the words is drawn by code, so that one isn't offered — but the button's picture is yours to recolour.
Can I change the background behind the title screen?
Yes. It is a cube of six pictures — textures/gui/title/background/panorama_0.png to panorama_5.png — and the game turns it two degrees a second with an 85 degree lens. Drop in one picture for all six sides, pick a flat colour, or replace each side on its own. The see-through sheet the game lays over it, panorama_overlay.png, ships as a single transparent pixel in current versions, so it changes nothing until you replace it.
How do I add my own splash texts?
Write them one per line. On Java they go in assets/minecraft/texts/splashes.txt; on Bedrock they go in splashes.json. Their yellow colour and the way they tilt and bounce come from the game's code, so those stay as they are.
Does it work on Bedrock?
The title screen does: Bedrock's wordmark (textures/ui/title.png), its splash list and its panorama are all pack files. Bedrock's startup screen happens before any pack is loaded, so that one stays Mojang's, and newer Bedrock builds light the menu with HDR panoramas, in which case a picture background may not show.
Which versions can I build for?
Java 1.21 and newer, where the wordmark is one 1024x256 picture, and 1.8.9, where it is two tiles in a 256x256 sheet and there is no edition line — the pack is built the right way for whichever you pick. Bedrock packs are cross-version.
Does the preview match my version?
Yes — each version's title screen is drawn the way that version's own game file builds it. Minecraft 26.2 and newer give the friends, language and accessibility buttons a row of their own with Options and Quit below; 26.1 and every 1.21 release put the language and accessibility buttons either side of Options and Quit; 1.8.9 has only a language button, no line under the logo, its logo is two tiles of one sheet and its splash sits in a different place. Bedrock's start screen is built by the game rather than by a pack, so its shape here is modelled from the game's own ui/start_screen.json.
Can I undo a change?
Yes. Undo and Redo sit on the bar, Ctrl+Z and Ctrl+Shift+Z work (Cmd on a Mac), typing folds into word-sized steps, and Reset puts the whole screen back to the game's own — which you can undo too. Everything you change one at a time also has its own way back: the little arrow beside the colours puts that one thing back to vanilla.
