Compress
Heavy JPEGs become light. PNG and WebP encoders dialled in for size without ruining quality. Drop a folder of 200 images, get 200 lighter copies in seconds.
Made for Mac · Local · No upload
Compress images. That's it.
The simplest Mac app to compress, convert and resize images for websites, social media or email — in seconds, on your machine, without uploading a single byte.
No email · no credit card · 10 free images every day
Drop images or folder here
JPG, PNG, WEBP, TIFF, BMP, HEIC
Select images
Select folder
Quality: 75
very good
Format
JPEG
recommended
▾
Max side (px)
2400 px
▾
FILES (0) −72% · 4.2 MB saved
Clear all
Compress
- photo-2025-spring.jpg pending
- screenshot-export.png pending
- design-mockup.tiff pending
Features
Compress, convert, resize.
Three actions. One window.
Convert
Read JPG, PNG, WEBP, TIFF, BMP, GIF, HEIC. Write JPEG, PNG, or WebP. Pick a target format once — Kompressor handles the rest in one batch.
Resize
Cap the longest side at 800, 1200, 1600, 2400, 3200 px or keep the original. Aspect ratio preserved. Web-ready output, every time.
Quality
Smaller files. Same picture.
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.
Imperceptible loss, dramatic savings
Modern compression algorithms exploit how the human eye actually works — discarding what your retina ignores while keeping what it sees. At quality 75 (Kompressor's default), a folder of 200 photos that took 1.2 GB on disk routinely ends up under 60 MB. Side-by-side, you cannot tell which is which. Only your storage bar can.
Push the slider up to 90+ for archival-grade images that still shed two-thirds of their original weight. Or pull it down to 40 for radically light blog thumbnails that load instantly on mobile.
Compress and convert in one drop
Kompressor isn't just a compressor — it's a one-step format kitchen. Drop any image in, pick what comes out:
- Web — output WebP for the smallest modern format (30–50% smaller than JPEG).
- Light web — output JPEG for universal compatibility, still tiny.
- Print — JPEG quality 95+, original resolution kept.
- Transparency — keep PNG, just resize and strip metadata.
- Conversion — drop a folder of WebP, get JPEG (or vice versa) — compress and convert in one batch.
How it works
Drop. Compress.
Done.
Built for one workflow: take an image, make it lighter, send it somewhere. Three reasons it stays out of your way.
01
100% local
Your images never leave your Mac. No upload, no servers, no telemetry. You can use Kompressor on a plane, in a tunnel, or with the Wi-Fi unplugged. Privacy by design.
02
Two settings, no decisions
A quality slider and a max-size dropdown. JPEG by default with a recommended tag — pick PNG or WebP if you really need to. No 12-tab preferences window.
03
Folder-first batches
Drag a single image, ten images, or a whole folder. Compressed
copies land in ~/Documents/Kompressor/ with a
-kompressor suffix — never overwriting your
originals.
04
Tiny native app
6 MB universal binary. Built with Rust and Tauri — that's 60× lighter than an Electron equivalent. Cold launch is instant; compression uses native CPU cores.
Light mode. Dark mode. Or whatever your system says.
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
Made for getting images out the door.
Websites
Drop a folder of hero shots. Get web-ready JPEGs that pass Lighthouse.
Social media
Stay under platform limits without giving up sharpness.
Send 20 photos at once without "attachment too large" bouncing back.
Newsletters
Lighter images, faster open times, happier readers.
Pricing
Try free, forever. Or unlock unlimited.
10 images every day, free, no questions asked. When you need more, pick a one-time license — never a subscription.
Free
$0
No email. No card. Try it now.
- 10 images every day
- All input formats supported
- JPEG, PNG, WebP output
- All resize presets
- Resets every day, automatically
Pro
$2.99
one-time
For one Mac, forever.
- Unlimited images, forever
- 1 license for 1 Mac
- All formats, all resize presets
- Free updates for life
- Email support from a human
Team
$9.99
one-time
For up to 5 Macs.
- Unlimited images, forever
- 5 license activations
- All formats, all resize presets
- Free updates for life
- Priority email support
One-time licenses · refundable within 14 days · pay once, no subscription, ever.
Get Kompressor.
6 MB · Universal binary (Apple Silicon + Intel) · macOS 11+
Download for MacFirst launch — quick one-time step
Kompressor isn't yet notarised by Apple (we will, once revenue covers the $99/year fee). macOS will ask before the first run:
- Move Kompressor.app to your Applications folder.
- Try to open it — macOS will block it with "Apple cannot verify…". That's expected. Click Done.
- Open System Settings → Privacy & Security, scroll to the Security section, and click Open Anyway next to Kompressor.
- Confirm with your password or Touch ID. That's it — Kompressor opens normally from now on.