Free online tools that
run entirely in your browser
Convert, compress and edit images in seconds. Your files never leave your device — fast, private and free. Kaochepai is growing into a toolbox of thousands of utilities.
All tools
Search or filter to find what you need. Click a card to open the tool on its own subdomain.
AVIF to JPG
Convert modern AVIF images into widely-compatible JPG files instantly, right in your browser.
JPG to PNG
Turn JPG/JPEG photos into PNG images with lossless quality and optional transparency.
PNG to WebP
Shrink PNG files into modern WebP format with adjustable quality for faster websites.
Image Compressor
Reduce image file size with a quality slider and see before/after comparison instantly.
Image Resizer
Resize images to exact dimensions or scale by percentage, with optional aspect-ratio lock.
WebP to PNG
Convert WebP images to PNG format with lossless quality, right in your browser.
PNG to JPG
Turn PNG images into JPG files with adjustable quality for smaller file sizes.
WebP to JPG
Convert WebP images to widely-compatible JPG format instantly.
JPG to WebP
Convert JPG photos to modern WebP format for smaller file sizes and faster websites.
AVIF to PNG
Convert AVIF images to PNG format with lossless quality and transparency support.
AVIF to WebP
Convert AVIF images to WebP format with adjustable quality.
BMP to JPG
Convert uncompressed BMP images to compact JPG format.
BMP to PNG
Convert BMP images to PNG format with lossless compression.
GIF to JPG
Extract the first frame of a GIF and convert it to JPG.
GIF to PNG
Extract the first frame of a GIF and convert it to PNG.
SVG to JPG
Convert SVG vector graphics to JPG raster images instantly.
SVG to PNG
Convert SVG vector graphics to PNG raster images with transparency.
SVG to WebP
Convert SVG vector graphics to WebP format for smaller file sizes.
Image to Base64
Convert images to Base64 or Data URL strings for embedding in HTML and CSS.
Base64 to Image
Convert Base64 or Data URL strings back to downloadable image files.
Image Watermark
Add text watermarks to images with adjustable position, size and opacity.
Image Cropper
Crop images to exact dimensions by specifying the crop area.
Image Rotator
Rotate images by 90, 180 or 270 degrees instantly.
Image Grayscale
Convert images to grayscale with adjustable intensity.
Image Flip
Flip images horizontally or vertically in one click.
Why Kaochepai?
Every tool on Kaochepai runs fully on your device. Your images are decoded and processed by your browser's Canvas engine — they are never uploaded to a server. That means three things:
- Private. Nothing leaves your computer. Perfect for sensitive or personal photos.
- Fast. No round-trip to a server. Processing starts the moment you drop a file.
- Free. No accounts, no limits, no watermarks. Use it as much as you like.
We are steadily expanding the catalog toward thousands of tools, each on its own clean subdomain for easy bookmarking and sharing.
Are my files uploaded anywhere?
No. All processing happens locally in your browser using the Canvas API. Your files never touch our servers.
Which browsers are supported?
Modern Chrome, Edge, Firefox, Safari and other evergreen browsers. AVIF decoding requires a recent browser version.
Is there a file size limit?
Only your device's memory. Because processing is local, very large images depend on your computer's RAM.
Will more tools be added?
Yes. Kaochepai is growing into a large toolbox. New tools are added regularly, each on its own subdomain.