The two biggest fears when compressing images: changing filenames and losing the original. ImgZilla handles both.
1. What is ImgZilla?
A native macOS image compression tool released on July 27, 2026. Its core behavior: compress images in place—filename, path, and format unchanged, with the original sent to the recycle bin by default for restore.
It's not a format converter, doesn't change resolution, and does just one thing: make the file size smaller, leaving everything else untouched.
Supports 8 formats: JPG/JPEG, PNG, GIF, SVG, HEIC/HEIF, WebP, AVIF. All compression is done locally; no internet required, and images are never uploaded to any server.
2. Core Difference: In-Place Overwrite + Recycle Bin Protection
Most tools save the result as photo-min.jpg—safe, but the filename changes, and webpage references, product table paths, and directory sorting all need to be updated.
ImgZilla takes a different route: the compressed result is written directly back to the original file.
The cost is that it touches the original file. So the product's real effort isn't in compression itself, but in the safeguards around that 'what if':
- After successful compression, the original is moved to the Trash first, then the compressed result is written back to its original path
- To restore, just open the Trash, right-click and 'Put Back'
- Enabled by default, with a confirmation dialog when turning off
This mechanism is unique among competitors—RasterFox supports in-place overwrite, but the original is only temporarily stored in a temp folder and cleared when the app closes. ImgZilla's trash-based approach aligns better with Mac user habits.
3. Comparison with Competitors
| Dimension | ImgZilla | Zipic | 轻压图片 | AnyCompressor |
|---|---|---|---|---|
| In-Place Overwrite | ✅ | ❌ | ❌ | ❌ |
| Original to Recycle Bin | ✅ | ❌ | ❌ | ❌ |
| Format Support | 8 types | 12 types | 5+ types | 3 types |
| Compression Control | Fixed parameters | 6 levels adjustable | Adjustable | Adjustable |
| Comparison Window | ✅ | ✅(Pro) | ❌ | ❌ |
| Free Quota | 10/day | 25/day | 20 per use | Limited |
Zipic has the most features but requires manual tuning; 轻压图片 is open-source and free but rough around the edges and requires manual export; AnyCompressor has narrow format coverage. ImgZilla's core difference lies in: specializing exclusively in in-place overwrite and perfecting it.
4. Image Quality: See for Yourself, Don't Trust Anyone
- PNG, SVG: Truly lossless compression, pixels stay the same
- JPEG, WebP, AVIF, HEIC, GIF: Essentially lossy re-encoding, with parameters chosen in the visually lossless range
Parameters are fixed; there are no sliders. Each format is tuned individually; users just drag in and click compress.
The most convincing feature is the built-in comparison window: for any successfully compressed image, there's a 'Compare' button on the right. A split-screen view with a draggable divider allows you to compare at actual size for careful inspection.
If you're not satisfied, just put the original back from the Trash. The fallback is always there.
5. Detailed Design
True Format Detection: Reads the file header magic bytes to determine the actual format, so even if the file extension is wrong, it's handled correctly.
'Already Minimal' Judgment: Skips when compression rate is less than 0.4%, does not consume free quota, and already optimized images won't be re-compressed.
External Storage Handling: When external drives/NAS can't move files to Trash, a pause dialog lets users choose 'Backup Directory' or 'Direct Overwrite', with the choice applied to all remaining files.
Serial Processing: Compresses one by one, prioritizing stability. The interface features scroll-follow, hover-to-pause, and real-time statistics.
6. Suitable Users
Best for:
- E-commerce sellers: batch compress product images without needing to update product table references.
- Developers: compress static assets with paths unchanged, automatically skips node_modules.
- Manga/photo collectors: directory structure remains intact, entire collection processed in one go.
- Mac users with small drives: freed-up space won't "grow back" like it does with cache cleaning.
- External storage users: images on external drives or NAS are compressed just the same.
Less suitable for:
- Users who need fine-tuning—parameters are fixed, no sliders.
- Users who need format conversion—doesn't convert to WebP or other formats.
- Windows users—macOS only.
7. Pricing
- Free version: 10 images per day, resets daily. Quota is only deducted upon successful compression.
- Paid version: one-time purchase or monthly subscription.
- When quota is exhausted, the task is paused (not aborted); after purchase, compression resumes from where it left off.
Summary: The market isn't short of image compression tools. What's missing is one that dares to touch your original files and still leaves you a way out. ImgZilla has perfected 'in-place overwrite'. With 10 free images per day, try it out before you trust it.
System requirements: macOS 12.3 or later.