Bedrock NBT Editor vs biomed

Bedrock NBT Editor is a free browser-based tool for editing Minecraft Bedrock Edition and Java Edition NBT files. It accepts files such as level.dat, playerdata, .nbt, .mcstructure, .schem, and .schematic, and detects byte order, headers, and compression across five NBT encodings. Users can search tags, add or remove them, change values, and download the edited file. The editor can also export the tree as SNBT text and convert between Bedrock files and Java big-endian gzip format. For large files, typed arrays and lazy rendering display 200 entries at a time; BigInt preserves 64-bit TAG_Long values such as world seeds and UUID halves. Files are parsed locally, with no upload endpoint, and the editor continues to work offline after the page loads. Android users can choose a world file from a file manager; iOS users must first put it in the Files app. The project is open source under the MIT license. The maker says it is not affiliated with Mojang Studios or Microsoft.

biomed is a free Minecraft biome editor for Java world saves containing level.dat and a region directory. Choose a biome and use Fill or Draw tools to apply it on the map, then switch between biome and map views. Its Fix Snow/Ice tool melts snow and ice in warm biomes and adds it in cold biomes. Open a savegame through File > Open World or select the map’s region directory manually; save edits through File > Save. The editor supports region editing and batch operations, but not terrain or entity editing. It runs on Linux, macOS, and Windows and requires GTK 2.x. Precompiled downloads are listed for 64-bit Linux and 32-bit Windows. The software is free under the MIT license, which permits use, modification, distribution, and sale subject to its conditions. The license provides the software as-is and disclaims warranty. The README advises backing up maps before editing.