Resize JPG, PNG, and WebP images without uploading them.
Inputs: static JPG/JPEG/JFIF, PNG, WebP, supported 8-bit still AVIF, uncompressed BMP and restricted TIFF/TIF. Outputs: JPG, PNG and WebP only. Up to 20 MB per file and export, 16,384 px per side and 67,108,864 pixels. Images are re-encoded as raster pixels: EXIF and original metadata are not preserved; this is not a metadata sanitizer. JPG replaces transparency with white.
AVIF sequences, grids, layers, HDR, EXIF/rotation/crop features and unsupported BMP variants are refused. AVIF and BMP require compatible native browser decoding. TIFF supports one uncompressed 8-bit grayscale or RGB page (optional straight RGB alpha), up to 16,000,000 pixels. Compressed, tiled, high-bit-depth, CMYK, profiles and nested directories are refused. TIFF orientation is applied; original metadata is discarded. Untagged TIFF colors are treated as sRGB.
Image Resizer creates a new copy at your chosen width and height. Smaller dimensions are useful for websites, email, and storage; larger dimensions add pixels but cannot restore detail missing from the original.
Pixel dimensions are best for a precise requirement such as 1200 × 800. Percentage scaling is faster when you simply need half size, double size, or another proportional change.
The aspect ratio lock is on by default. It keeps width and height in sync to prevent stretching. Unlock it only when a specific non-proportional size is intentional.
Compact output for photos. Transparent areas become white.
Lossless output that preserves supported transparency.
Efficient quality-controlled output with transparency support.
Yes, as input only. JFIF is JPEG. Supported AVIF files contain one 8-bit image with optional alpha; sequences, grids, layers, HDR and transformation/EXIF features are refused. BMP supports validated uncompressed core/Windows headers, palettes and standard RGB/alpha masks. Compressed, profile-bearing and ambiguous BMP variants are refused. TIFF/TIF supports a restricted single-page, uncompressed unsigned 8-bit grayscale/RGB subset with optional straight RGB alpha and orientations 1–8, up to 16,000,000 pixels. Multipage, compression, CMYK, high bit depths, profiles and nested directories are refused. AVIF/BMP need compatible native decoding. HEIC/HEIF is not supported. Output choices remain JPG, PNG and WebP.
No. Animated and multi-frame inputs are refused. JPEG/JFIF images are decoded with supported EXIF orientation; TIFF orientation is also applied and re-encoded as raster pixels. Original EXIF and other metadata are not preserved. Browser color handling can change profiles or colors; this is not a metadata sanitizer or a guarantee of original pixel fidelity.
No. Resizing happens locally in your browser, so the selected image never leaves your device.
Use pixels when you need an exact width and height. Use percentage when you want a quick proportional scale, such as half size at 50%.
It keeps the original width-to-height relationship. Changing one dimension automatically updates the other so the image does not look stretched.
PNG and WebP output can preserve transparent areas. JPG does not support transparency, so transparent areas are placed on a white background.
Extremely large canvases can exhaust browser memory or fail differently across devices. ToolNest checks source dimensions before decoding and limits source and output to 16,384 pixels per side and 67,108,864 pixels. Input and export files are limited to 20 MB. Available memory can impose a lower limit.