Quality checked, not guessed.
SnapSlim evaluates every JPEG and HEIC result against a quality standard. PNG files are optimized losslessly. If the result is not good enough, SnapSlim keeps the original.
Image compression for Mac
Make images smaller, not worse.
Compress JPEG, PNG, and HEIC files with a simple drag and drop. SnapSlim checks every result and keeps the original when compression is not worth it.
- Free Early Access
- Apple Silicon
- Processed entirely on your Mac
See what changed. And what didn’t.
Drag the slider to compare the original image with the SnapSlim result.
- Original
- 13.7 MB
- SnapSlim
- 9.9 MB
- Saved
- 28.1%
- Quality
- Excellent
- SSIM
- 0.981
SSIM 0.981 — higher means closer to the original.
Results vary depending on the image, format, and selected mode.
Photo by Basile Morin, via Wikimedia Commons · CC BY-SA 4.0
Drop. Check. Done.
Image compression should not require expert knowledge or complicated settings.
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Step 1
Drop your images
Drag JPEG, PNG, or HEIC files into SnapSlim.
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Step 2
SnapSlim checks every result
Each image is compressed and checked before the result is accepted.
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Step 3
Find your optimized files
Optimized files are saved in a separate folder next to the originals.
Built to be simple. Designed to be careful.
Your images stay on your Mac.
SnapSlim processes files entirely on your device. No uploads, no cloud processing, and no account required.
Simple on purpose.
Choose a mode, drop your images, and let SnapSlim handle the rest. No complicated export settings or compression jargon.
Choose your balance.
Use Standard for everyday compression, or High-Precision when you want SnapSlim to evaluate more possibilities.
Standard
Fast, careful compression for everyday use.
SnapSlim checks the result and keeps the original when compression is not worth it.
High-Precision
Evaluates more compression candidates to find the smallest result that meets SnapSlim’s quality standard.
Best for images where quality and file size both matter.
Processing time varies depending on the image, format, and selected mode.
What’s next for SnapSlim
SnapSlim is just getting started. Here are some of the features and platforms we are working toward.
Mac App Store
A Mac App Store version is planned for a future release.
WebP and AVIF support
Support for additional image formats, including WebP and AVIF, is planned for future updates.
SnapSlim for Windows
A Windows version is planned as SnapSlim expands to more platforms.
Plans and priorities may change based on technical findings and early-access feedback.
FAQ
Which Macs are supported?
Requires macOS 14 or later and an Apple Silicon Mac. Intel Macs are not supported.
Is SnapSlim free?
SnapSlim is in free Early Access with a limit of up to 15 images per day. A paid version is not available yet.
Does SnapSlim upload my images?
No. Images are processed locally on your Mac. No account is required.
Which formats are supported?
JPEG, PNG, and HEIC.
Where do optimized files go?
Optimized files are saved in a separate folder next to the originals (for example, an Optimized folder beside your source files).
Download SnapSlim
Start compressing images on your Mac in minutes.
SnapSlim for macOS
Download ZIP
SnapSlim-1.0.0-7.zip
SHA-256:
4ee6a24e09b36057d65319793fcee88ca1319de92f81abe84963cb7242c76380
Unzip SnapSlim and open the app. SnapSlim will move itself to your Applications folder.
macOS may ask you to confirm opening an app downloaded from the internet.
Notarized by Apple · No account required · Images stay on your Mac
Help shape SnapSlim.
SnapSlim is currently in free early access. Your feedback helps improve compatibility, compression quality, and the overall experience.
Share feedback
Tell us what worked well, what felt confusing, or what you would like to see next.
Report a bug
Found something unexpected? Send us the details so we can investigate.
We review every submission carefully. While we cannot guarantee an individual response, we will help whenever reasonably possible.