Image tools for smaller, sharper web files.
Compress image files, convert between modern formats, and prepare assets for websites, shops, blogs and apps. Everything runs locally in your browser, so your images stay on your device.
Image tools
Start with compression when the format is already right. Use conversion when you need a specific output type for a website, app, shop or upload form.
Reduce file size for PNG, JPEG, WebP, AVIF, GIF and BMP images with scale controls, quality settings, palette reduction, dithering and batch ZIP downloads.
Convert images between PNG, JPEG, WebP, AVIF and BMP in your browser. Pick a target format, adjust quality or scale, preview the result and download one file or a batch ZIP.
Compress or convert?
The fastest route depends on whether your problem is file size, format compatibility, transparency or visual quality.
Use Image Crusher when size is the problem
Choose compression for screenshots, product photos, social images, blog graphics and app assets that are already in the right format but too large to upload or serve quickly.
Use Format Forge when format is the problem
Choose conversion when you need a specific output type: transparent images, compact photos, modern web delivery, or compatibility with older software.
Free online image compressor and converter tools
BigJobby image tools are built for everyday image cleanup: reducing file size, converting between formats, compressing AVIF, shrinking JPEG photos, optimising PNG graphics, and preparing mixed batches of images for websites. The tools use browser APIs and local encoder assets, so there is no upload step and no waiting for a server queue.
Best format for websites
The best format depends on the job. Use lossless formats for transparency, sharp screenshots and interface artwork; JPEG remains reliable for photographs; WebP is a strong modern default for smaller web images; and AVIF can create very compact files when browser support and encoding time are acceptable. Format Forge helps compare those outputs quickly.
Best way to reduce image file size
Start with Image Crusher. Lower the scale if the image is larger than needed, then tune quality for photo formats or use colour reduction for flat artwork, icons, UI screenshots and diagrams. Dithering can help gradients look smoother, while no-dither mode is often better for logos and hard-edged graphics.
Image tool questions
Are these tools private?
Yes. The tools process your images inside the browser. Files are not uploaded to BigJobby servers for compression or conversion.
Can I compress AVIF files?
Yes. Image Crusher supports AVIF input and uses a bundled local AVIF encoder to create smaller AVIF output.
Can I convert images to WebP or AVIF?
Yes. Open Format Forge, choose WebP or AVIF, then select your images and convert them locally.
Why did my converted file get bigger?
Some conversions trade size for compatibility or lossless output. BMP is usually much larger, and lossless formats can be larger than WebP or AVIF for photos.
Can I process multiple images?
Yes. Both tools support batch workflows and can download the finished images together as a ZIP archive.
Do these tools work on mobile?
Yes. They are designed for modern mobile and desktop browsers, though very large batches may be faster on a desktop or laptop.