Image compression and optimization tools
Image Compressor is a free online tool that helps you optimize image files by reducing their size while preserving visual quality. Since all processing happens locally in your browser, your files remain private and secure. It's ideal for improving website performance, reducing storage usage, and sharing images more efficiently.
Combine JPG, PNG or WebP images into a high-quality animated GIF. Customize frame speed, preview the animation, and download your GIF instantly. Everything runs locally in your browser for maximum privacy.
Protect your images with professional watermarks. Add text or logo watermarks with customizable position, pattern, opacity, and size. Perfect for photographers, designers, and content creators who want to protect their work.
NinjaFunction's Image Resizer changes the width and height of any picture in seconds. Type an exact size in pixels or choose a percentage, keep the aspect ratio so nothing is stretched, pick PNG, JPG or WebP, and download the result with its new file size shown. Quick width buttons cover common sizes such as 1920 and 1280 pixels. The image is resized in your browser, so it is never uploaded to a server.
NinjaFunction's Image Cropper lets you cut a picture down to the part that matters. Drag the crop box, resize it with the corner squares, pick a ready shape such as 1:1, 4:3, 3:2, 16:9, 9:16 or 4:5, or type the exact position and size in pixels. Save the result as PNG, JPG or WebP. It works with a mouse, a finger or the arrow keys, and the image is cropped in your browser, so it is never uploaded to a server.
NinjaFunction's Image Converter changes the format of your pictures between PNG, JPG and WebP. Add up to 20 images, choose the new format and quality, and see the old and new file size for each one. Pick a fill colour for see-through areas when you convert to JPG, then download the files one by one or all together as a ZIP. Everything is converted in your browser, so your images are never uploaded to a server.
NinjaFunction's Meme Generator puts bold white text with a black outline on any picture. Type the top, middle and bottom text, change the size and colours, and watch the preview update as you type. Long sentences shrink by themselves so no word is cut off. Download the meme as a PNG or a JPG. It is made in your browser, so your picture is never uploaded to a server.
NinjaFunction's HEIC to JPG Converter turns HEIC and HEIF photos from an iPhone or iPad into JPG, PNG or WebP in your browser. Choose up to 50 photos, pick the format and quality, convert them, and download each photo or all of them as a ZIP. The converted pictures carry no location or camera details. Your photos are never uploaded.
Image tools help you prepare pictures for websites, social media and messaging. Smaller, well-prepared images load faster, look more professional and are easier to share.
The Image Compressor reduces the file size of JPG, PNG and WebP images while keeping them looking sharp, which helps your website load faster and saves storage space. The Watermark Tool adds a text or logo watermark to protect your photos and promote your brand. The GIF Creator turns a set of images into an animated GIF for tutorials, product demos or social posts. All three work in your browser, so your images are not uploaded to a server.
Compression removes data the eye barely notices, so a moderately compressed image usually looks the same as the original while being much smaller. Very strong compression can make images look blurry or blocky, so preview the result before saving.
Use WebP where possible, as it gives small files with good quality. Use JPG for photos, PNG for graphics that need a transparent background or sharp edges, and GIF only for simple animations.
No. The Image Compressor, Watermark Tool and GIF Creator process your images in your browser, so they stay on your device.