Image Compressor — JPG, PNG, WebP, AVIF, Browser-Only
Compress JPEG, PNG, WebP and AVIF images directly in your browser with zero file uploads. Our client-side image compressor reduces file sizes by up to 80% while preserving visual quality — your photos never leave your device. Perfect for web optimization, email attachments, and social media, with complete privacy guaranteed.
Compression targets a visual quality level rather than a blind percentage, which is the difference between a file that is smaller and one that is smaller and still usable. Photographs typically drop 60-80% with no difference you can see at normal viewing size, because JPEG discards detail the eye was not going to resolve anyway. Screenshots and graphics behave differently: they have flat areas and hard edges that compress badly as JPEG, so keeping them as PNG or WebP gives a better result at a smaller size.
How to use Image Compressor
- Upload your image file(s) — JPG, PNG, WebP or AVIF.
- Set the quality, choose whether to keep the format or save as WebP or JPG, and optionally cap the longest side.
- Click "Compress", check the before/after sizes and use Compare to look at the result next to the original.
- Download individually or all as a ZIP archive.
Features
- JPG, PNG, WebP and AVIF — Keep the format, or convert to WebP or JPG while compressing.
- 100% browser-based — Files never leave your computer. No server uploads.
- Adjustable quality slider — Fine-tune compression from 10% to 100% for the perfect balance of size and quality.
- Batch compress multiple images — Upload and compress many images at once.
- Before/after compare — Sizes with the saving, and the two images side by side.
- Never bigger — If a re-save would grow the file, the original is kept.
- No sign-up, no watermarks, no file size limits — Completely free to use.
Frequently Asked Questions
How do I compress an image without losing quality?
Use a smart lossy compression tool that removes only imperceptible image data. Set the quality slider between 75–85% for the best balance of file size reduction (up to 80%) and visual quality. Our browser-based compressor lets you preview the result before downloading.
Is it safe to compress images online?
Most online compressors upload files to remote servers, which poses privacy risks. UtilHub's image compressor runs entirely in your browser — your files are never uploaded to any server, making it the safest option for sensitive or private images.
What is the best image format for compression?
JPEG is best for photographs (lossy compression, smallest files). PNG is best for graphics with text or transparency (lossless). WebP offers the best of both worlds with 25–35% smaller files than JPEG at similar quality, and is supported by all modern browsers.
How much can I compress before it starts to look bad?
For photographs, quality 80 is the usual sweet spot — typically 60-70% smaller than the original with no visible difference at normal size. Below about 60 you start to see blocking in skies and gradients. Screenshots and images with text degrade much earlier, which is a sign they should be PNG or WebP rather than JPEG.
Will compressing lose the photo's metadata?
EXIF data is stripped during compression, which is usually what you want before publishing a photo — it removes GPS coordinates, camera serial numbers, and timestamps. If you need the metadata for cataloguing, keep the original file and treat the compressed copy as an export for the web.