- Recommended setting: When an image is loaded, it shows the estimated size and reduction ratio at "visually lossless" quality (JPEG 85). Safe lower bound: quality 70 — below that, the loss becomes visible to the eye.
- Percentage compression: You pick the JPEG quality from 1–100.
- Downscale by pixels/resolution: by percentage, target width, or target height (aspect kept).
- Target-size mode: Say "this file should be at most 200 KB" and the tool adjusts the quality (and, if needed, the resolution) automatically to fit.
- Unicode path support: Paths with non-ASCII characters work (e.g. Turkish: Masaüstü, ç/ş/ü) via UTF-8.
- Input: JPG, PNG, BMP, TGA, GIF (first frame), PSD. Output: JPG (highest compression). Transparent (alpha) areas are flattened onto a white background.
A C compiler is required (MinGW-GCC recommended):
winget install --id BrechtSanders.WinLibs.POSIX.UCRT -eOpen a new terminal in the project folder:
build.batThis produces imgcompress.exe. (Manually: gcc -O2 -std=c11 -o imgcompress.exe main.c -lm)
Interactive (menu) mode — just run it:
imgcompress.exeBy passing an image directly:
imgcompress.exe "C:\Users\...\photo.png"With options (no menu):
imgcompress.exe photo.jpg -q 80
imgcompress.exe photo.jpg --scale 50
imgcompress.exe photo.jpg --width 1280
imgcompress.exe photo.jpg --target 200 REM at most 200 KB
imgcompress.exe photo.jpg -q 85 -o small.jpg| Option | Description |
|---|---|
-q <1-100> |
JPEG quality percentage (default 85) |
--scale <%> |
Downscale dimensions to a percentage |
--width <px> |
Downscale by width (aspect kept) |
--height <px> |
Downscale by height (aspect kept) |
--target <KB> |
Target file size; find quality automatically |
-o <output> |
Output file (default <name>_compressed.jpg) |
-1.jpg)
