gba rle compression — free browser tool | fatcousin

nintendo gba bios rle decompress + compress · swi 0x14 · 0x30 header · run + literal blocks · rom-hacking tool · runs locally

mode

drop file

drop a GBA RLE-compressed file

.bin .rle — must start with 0x30

Select file

status

drop a file to RLE compress or decompress

format reference

GBA RLE stream layout

byte 00x30 (magic)

bytes 1–3decompressed size (24-bit LE)

flag MSB=1run: low7 + 3 = count, next = value

flag MSB=0literal: low7 + 1 = count, copy bytes

run range3–130 bytes

literal range1–128 bytes

BIOS SWI0x14 — RLUnCompWRAM

usage notes

best fordata with long repeated runs

worst forvaried / pseudo-random data

reversiblecompress → decompress = original

BIOS SWI0x15 — RLUnCompVRAM (VRAM mode)