No—compression uses Canvas locally.

WebP is usually smaller at the same quality; JPG has broader support.

Lossy compression removes detail—raise quality or limit resize instead of over-compressing.

Use our HEIC to JPG tool first, then compress here.

How many images at once?

No fixed cap—memory bound. Dozens of files or a few hundred MB total is usually fine.

You keep rights to your images; we add no watermark.

Image Compress

Batch compress PNG/JPG/WebP with quality and size controls—local, nothing uploaded.

Select images (multiple)

Select or drop image

No images selected yet. After you choose or drop files, they appear here.

Output formatQuality (0.1–1.0)

How to use & FAQ

Why Tools Ku

100% free, no signup
Batch process, ZIP download
WebP or JPG output
Photos never leave your device

Uploads, email, and social posts often need smaller images. Re-encode in the browser with your quality and max-edge settings—strong size savings while keeping acceptable visuals.

Accepts PNG, JPEG, WebP, GIF; outputs WebP (smaller) or JPG (wider compatibility). Local-only—good for private photos.

Steps

Upload one or more images
Pick output format, quality, and max edge length
Run compress and wait locally
Download individually or as ZIP

FAQ

Are images uploaded?: No—compression uses Canvas locally.
WebP or JPG?: WebP is usually smaller at the same quality; JPG has broader support.
Will quality suffer?: Lossy compression removes detail—raise quality or limit resize instead of over-compressing.
HEIC from iPhone?: Use our HEIC to JPG tool first, then compress here.
How many images at once?: No fixed cap—memory bound. Dozens of files or a few hundred MB total is usually fine.
Commercial use?: You keep rights to your images; we add no watermark.