Compress and convert images, privately
Large image files slow down websites, fill up storage and are slow to send. ImageBloom makes them smaller and lets you switch between formats in a couple of clicks — and because everything happens inside your browser using the HTML canvas, your pictures are never uploaded to any server. That makes it fast, free and private, even for sensitive photos.
JPG, PNG or WebP — which should you use?
JPG is best for photographs: it compresses smoothly and produces small files, but it has no transparency. PNG is lossless and supports transparency, which makes it ideal for logos, icons and screenshots, though files are larger. WebP is the modern all-rounder — it usually beats both, giving smaller files at similar quality with transparency support, and is supported by every current browser.
How compression works
For JPG and WebP, the Quality slider controls how much detail is kept: lower quality means a smaller file. Around 75–85% is a sweet spot where the savings are large but the image still looks great. PNG is lossless, so the quality slider does not apply to it — to shrink a PNG, converting it to WebP usually helps most.
Resizing
Set a maximum width or height to scale large photos down — often the biggest space saving of all. A 4000-pixel phone photo is far larger than it needs to be for a website or social post. Aspect ratio is always kept, and images smaller than your limit are left untouched.