Same quality · Seconds · 100% on your Mac
Kompressor makes images dramatically lighter while keeping a quality no one can tell from the original — in seconds, entirely on your Mac. No upload, no account, works fully offline.
No email · no credit card · 10 free images every day
Drop images or folder here
JPG · PNG · WEBP · TIFF · BMP · HEIC
Features
Make your images far lighter without anyone noticing the difference. Drop in a whole folder and get smaller copies back in seconds.
Turn one image format into another. Drag in just about anything, choose what you want out, and it's done — all in one go.
Big photos are often far larger than they need to be. Pick a size and Kompressor scales them down — the proportions stay perfect.
Quality
At default settings the loss is invisible to the naked eye — but file weight can drop by up to 99%. A 5 MB DSLR shot becomes a 50 KB JPEG no one will spot apart from the original.
Kompressor only throws away the detail your eye can't see, and keeps everything it can. A folder of holiday photos that filled 1.2 GB comes out under 60 MB — and side by side, you honestly can't tell which is which.
See for yourself below — even at 50% quality the difference is barely perceptible, yet the file is a fraction of the size.
Kompressor isn't just a compressor — it's a format kitchen. Drop an image in, choose what comes out:
How it works
One simple job, done well: take an image, make it lighter, get on with your day. Here's what keeps it out of your way.
Your images are never uploaded anywhere. Nothing is sent to a server, nothing is tracked. It works perfectly on a plane or with the Wi-Fi switched off.
Just a quality slider and a size menu — that's the whole interface. The best format is already chosen for you, so you can simply drop and go.
Drag in a single photo or drop an entire folder at once. You get fresh, lighter copies — your originals are never touched.
~/Documents/Kompressor/
with a -kompressor suffix, so nothing ever gets
overwritten.
The whole app is just 6 MB and opens the moment you click it. It's built natively for Mac — not a heavy web app dressed up in a window.
Kompressor follows your macOS appearance by default — it flips to dark at sundown and back to light in the morning, automatically. Override manually anytime via the small theme toggle in the bottom-right corner.
Use cases
Drop a folder of hero shots. Get web-ready JPEGs that pass Lighthouse.
Stay under platform limits without giving up sharpness.
Send 20 photos at once without "attachment too large" bouncing back.
Lighter images, faster open times, happier readers.
Pricing
10 images every day, free, no questions asked. When you need more, pick a one-time license — never a subscription.
No email. No card. Try it now.
For one Mac, forever.
For up to 5 Macs.
One-time licenses · pay once, no subscription, ever.
6 MB · Universal binary (Apple Silicon + Intel) · macOS 11+
Kompressor isn't notarised by Apple just yet (it will be, once revenue covers the $99/year fee), so macOS asks you to confirm the very first time:
FAQ
Download Kompressor, drag your images or a whole folder onto the window, and click Compress. It's a native macOS app built for exactly one job — making images lighter — so there are just two settings (a quality slider and a max-size dropdown) and no setup to learn.
Use a local app like Kompressor instead of a website. Kompressor is 100% local — your images are processed on your Mac and never leave it, with no upload, no account, and no telemetry. Compressed copies are saved to ~/Documents/Kompressor/ with a -kompressor suffix, so your originals are never overwritten.
Yes. Kompressor is free for 10 images every day, with no email, no credit card, and no trial countdown — the free tier resets automatically each day. If you need more, a one-time Pro license is $2.99 for unlimited images on one Mac.
Kompressor is a fully offline, native Mac alternative to web tools like TinyPNG. Because it runs entirely on your machine, there's no upload step, no batch limit, and no internet required. On JPEG and WebP the results are within a few percent of TinyPNG; TinyPNG keeps a slight edge on PNG.
Kompressor is free for 10 images a day. To remove that limit you buy a one-time license — $2.99 for Pro (1 Mac) or $9.99 for Team (up to 5 Macs) — with no subscription, ever.
Compression is lossy, but at Kompressor's default quality of 75 the difference is invisible to the naked eye while file sizes drop dramatically. You can push the slider up to 90+ for archival-grade images or down to 40 for ultra-light web thumbnails.
Yes. Kompressor reads HEIC (along with JPG, PNG, WEBP, TIFF, BMP, and GIF) and writes JPEG, PNG, or WebP. Pick JPEG as the output format, drop your HEIC files in, and it converts and compresses them in one batch.
Yes, completely. Kompressor needs no internet connection because all the work happens locally on your Mac. You can compress on a plane, in a tunnel, or with the Wi-Fi unplugged — privacy by design.
Kompressor runs on macOS 11 and later as a Universal binary, so it works natively on both Apple Silicon and Intel Macs. It's a tiny ~6 MB app built with Rust and Tauri, so it launches instantly and uses your CPU cores for compression.