Shrink JPG, PNG, and WebP images directly in your browser. Adjustable quality, optional resize to common dimensions, batch processing. Compression happens entirely on your device — nothing is uploaded to a server, no account is required, and Culacc has no copy of your images.
Compress JPG for email — most mail providers cap attachments at 25 MB. Drop a photo at 82% quality and it usually fits.
Compress images for web — page weight directly hits SEO and Core Web Vitals. WebP at 70–80% quality is the sweet spot for hero images.
Compress PNG without losing transparency — note: this tool converts PNGs to WebP, which preserves transparency at much smaller size. If you specifically need a smaller PNG, use the converter instead.
Compress images for WhatsApp, Telegram, or Discord — those apps already compress aggressively, but pre-compressing avoids quality loss from their re-encoding pass.
Compress photos before sharing or uploading — phone cameras produce 5–10 MB images that aren't useful at that size anywhere. 1–2 MB is plenty for everything but print.
Most "compress image online" sites upload your photos to a server, process them there, and send back smaller copies. That works, but your photos — sometimes personal, sometimes sensitive — pass through someone else's infrastructure with vague retention policies and ads everywhere. This tool runs compression directly in your browser using the Canvas API. Image bytes never leave your device. Culacc has no copy. Even if our servers were compromised, your photos wouldn't be there because they were never sent.
No. Compression runs locally in your browser using JavaScript. Image bytes never leave your device, and Culacc has no server-side copy to forget about.
JPEGs typically shrink 60–90% at the default quality (82%). PNGs are converted to WebP for major savings — usually 50–80% smaller. Most images land in the 40–80% smaller range without visible quality loss.
WebP gives the same visual quality (including transparency) at a fraction of the size. If you need PNG specifically — for compatibility with older systems or specific software that doesn't support WebP — use the converter tool instead, which produces PNG output.
Practically, no. Your browser is the only constraint. Devices comfortably handle up to ~50 MB images individually. For batches of hundreds of images at once, prefer a desktop browser.
Yes. Copy any image (a screenshot, a copied photo from another tab) and paste with Ctrl+V (or Cmd+V on Mac) directly into the page. The image gets compressed the same as a dropped file.
At 82% (the default), no — most people can't tell the difference. Below 60%, JPEG artifacts start to appear in areas with smooth gradients (sky, skin). The quality slider lets you balance file size vs. fidelity for your specific use case.
Yes — make a free Culacc account (5 GB, every feature unlocked) and use the Cloud button. Compressed images land in your storage, available on every device you sync.