How to compress images online — free, no upload

Shrink one image or hundreds at once, right in your browser. Pick a size, click Download, and every image is compressed with the same setting — no sign-up, no software, and your files never leave your device.

Big image files are a daily nuisance: the email that bounces because the attachments are too heavy, the website that loads slowly, the form that rejects your photo, the PowerPoint that balloons to 200 MB. Most online compressors fix this one image at a time — and quietly upload your files to their servers to do it.

Inkso compresses your whole batch at once, entirely on your own device — pick one setting, download them all.

Compress your images in three steps

1. Add your images

   Open the free image tool, click Compress, and drop your images anywhere on the page — one file or a whole folder's worth. JPG, PNG and iPhone HEIC photos all work.

2. Pick a size

   Choose how much smaller: 75%, 50% or 25% of the original file size — or pick a purpose: Print, Presentation or Webpage — and the right quality is worked out for you.

3. Download

   Click Download. One image saves as a single file; a batch saves as one ZIP with every image compressed. Done — free, no account, no watermark added.

Two ways to choose the size

Shrink by percentage — quick and predictable

The 75% / 50% / 25% buttons target a fraction of each file's original size: choose 50% and every image comes out at roughly half the file size it went in with, whatever its resolution. It's the fastest way to get a folder of photos under an attachment limit.

Optimise for a purpose — smarter for mixed batches

The Print, Presentation and Webpage buttons work differently: they compress each image to the optimal quality for that use — high-resolution 300 DPI for printing, Full-HD for slides, lean and fast for websites. Crucially, an image that's already at or below the target resolution is left untouched, so small images never get degraded. That makes these presets safe to run over a mixed batch of large and small images.

Compress hundreds of images at once

There's no per-image fiddling: the setting you pick applies to every image you've loaded, and a batch downloads as a single ZIP. Because nothing is uploaded, there's no queue and no waiting for transfers — a hundred photos compress about as fast as your computer can process them, not as fast as your internet connection allows.

iPhone HEIC photos? Recognised — and converted to JPG

iPhones save photos as HEIC, which many websites, forms and older programs simply refuse. Inkso recognises HEIC automatically: drop your iPhone photos in and they're decoded on your device and saved as standard JPG. That works for a whole camera roll at once — add dozens of HEIC photos, click Download, and you get a ZIP of JPGs. Use it together with Compress to convert and shrink in one pass, or on its own as a free bulk HEIC-to-JPG converter.

Your images never leave your device

Compression, HEIC conversion and zipping all happen locally in your browser. Your images are never uploaded to a server — nothing is stored, scanned or kept. Close the tab and they're gone.

Frequently asked questions