IMAGE · AmpCub image helper
Image compression & batch tools
Batch-compress to a target file size for forms and messaging apps.
Images stay in your browser. File names, image content, EXIF, and results are never sent to Analytics.
1. Choose images
Drop images here or click to choose files
JPEG / PNG / WebP · up to 20 images · 25 MB each
To avoid mobile or browser memory issues, each image is limited to 40 MP and 12,000 px per side. Oversized images fail individually without affecting the rest.
LINE static sticker batch settings
Transparent PNG output with proportional, centered artwork. Regular stickers are up to 370 × 320 px; enabling trim also tightens the canvas to the artwork.
Checked: regular stickers get an even-sized, tightly fitted canvas (up to 370 × 320 px) with about 10 px safe margins. Unchecked: keep the fixed 370 × 320 px canvas. Main image (240 × 240) and chat tab (96 × 74) stay fixed. Solid backgrounds are never auto-removed.
A static sticker set requires 8, 16, 24, 32 or 40 transparent PNG images.
Compress below a target size
The tool gradually adjusts quality and, when needed, resolution to get under the target size. Results vary by image content and browser encoder, so an exact or lossless target cannot be guaranteed.
PNG has no reliable quality control, so target-size compression relies mainly on reducing resolution and is usually less precise than JPEG / WebP.
Resize image
Image format conversion
Keep the original resolution and convert only to the selected JPEG, PNG, or WebP format. Transparent areas become white when converting to JPEG.
Pad without cropping
Advanced settings
Used for JPEG / WebP. In target-size mode, this is the highest quality to preserve first.
Shortcuts: Ctrl+Enter Start
Frequently asked questions
Exact KB target?
Pick common targets or custom size; the tool aims as close as possible.
Uploaded?
Files never leave your browser.
Vs crop?
Compress targets bytes; crop changes framing and aspect ratio.