Images · Image Resizer
Resize many images at once on your computer
Quick answer
In Toolfox → Image Resizer, drop images and resize by percentage, width, height, “fit inside a box”, “fill and crop” or an exact size. Aspect ratio is kept by default and small images aren't enlarged. It runs entirely on your computer (Mac, Windows or Linux). Files are never uploaded.
How to do it
- Open Image Resizer and drop your images.
- Choose how to resize: percentage, width, height, fit, fill & crop, or exact size.
- Optionally change the output format.
- Click Resize. New files are named photo-1920x1080.jpg.
Options you can set
- Resize by
- Scale
- Width
- Height
- Don't enlarge smaller images
- Save as
- Quality
Good to know
- Resampling uses the Lanczos filter. HEIC, AVIF and GIF inputs are saved as PNG unless you pick a format.
- EXIF metadata is not copied; EXIF rotation is applied first.
Image Resizer FAQ
Does resizing keep the aspect ratio?
Yes, every mode except “Exact size” keeps it. “Fill box and crop center” fills the box exactly and trims the overflow.
Will it enlarge small images?
Not by default: “Don't enlarge smaller images” is on. Turn it off to upscale.
Is Image Resizer in Toolfox free?
Yes. Image Resizer is one of 57 tools in Toolfox, a free app for Mac, Windows and Linux with no account, ads, limits or watermarks.
Does Image Resizer upload my files?
No. Toolfox processes files on your own computer and works offline; your files are never uploaded.
More images tools in Toolfox
Get Image Resizer and 19 more tools.
Free forever. No account. Works offline. For macOS, Windows and Linux.
Updated 2026-10-18 · Toolfox v0.2.1