Free Online Transparency Trimmer - Remove Transparent Borders from Images
Other Image Tools
Free Online Transparency Trimmer - Remove Transparent Borders from Images
remove transparent borders from image
giga.tools transparency trimmer automatically removes transparent borders and empty space from your images. Upload any PNG or WebP file and the tool scans from all four edges to find where the visible content begins, then crops away transparent pixels. The process happens instantly in your browser without server uploads, keeping your images private. If your image's background is not yet transparent yet, use our AI powered photo background remover tool for free.
how to trim transparent pixels from PNG
Trimming transparent pixels from PNG files is straightforward with giga.tools. Upload your image, adjust the alpha threshold (0-255) to control which pixels are considered transparent, and download the trimmed result. The threshold determines pixels with alpha values below your setting are trimmed, set it to 0 for only fully transparent pixels, or higher to also remove semi-transparent borders.
crop image to content online
Cropping an image to its visible content removes unnecessary transparent padding. giga.tools analyzes the alpha channel of your uploaded image and calculates the minimal bounding box containing all non-transparent pixels. This is especially useful for icons, logos, sprites, and screenshots with excess transparent borders. After trimming the image's padding, you can also flip the image file.
what is alpha channel threshold
The alpha channel determines pixel transparency in images with transparency support (PNG, WebP). Values range from 0 (fully transparent) to 255 (fully opaque). The transparency trimmer's threshold setting defines which alpha values to trim - pixels with alpha below this value are removed from the edges. Lower thresholds preserve more content, while higher thresholds remove more pixels including partially transparent areas.
remove whitespace from image
When images contain transparent whitespace around the main subject, it increases file size and makes alignment difficult. The giga.tools trimmer efficiently removes this transparent whitespace, resulting in cleaner, more compact images. This is particularly useful for game sprites, UI icons, and transparent product photos.