How to Compress Images for Facebook Posts on Mac
Mac users can compress JPEGs without opening Preview or Photoshop. Facebook re-encodes uploads, and starting from a clean, right-sized JPEG gives it less room to introduce blocky artefacts.
Recommended settings for Facebook posts
| Setting | Starting point |
|---|---|
| Format | JPEG (WebP where accepted) |
| Width | about 2048 px on the long edge |
| Quality | 78 |
| File size | 400 KB or less |
These are practical defaults. If the platform or form you are using publishes its own limits, follow those instead.
How to Compress Images
Drag photos from Finder or the Photos app into the page. Set a maximum width of 2048 pixels and a quality near 78.
Press Compress and download. Because processing happens locally in Safari or Chrome, even large batches are fast and private, which helps when preparing images for Facebook posts.
Step by step with TheCompressJPEG
- Open the compress JPEG to 300 KB tool, or the main compressor for custom settings.
- Drop in your image. Nothing is uploaded; it is processed in your browser.
- Set the maximum width to 2048 and the target size to 400 KB.
- Press Compress, check the result and download it.
Quick tips
- Check the result on a phone, where most people will see it.
- Use consistent dimensions for a set of related images.
- Resize before you compress; it improves quality at any file size.
- Write a size limit slightly below the stated maximum to leave a margin.
FAQ
What JPEG quality should I use for e-learning courses?
Quality around 78 keeps photos looking natural while cutting file size substantially.
Will compressing reduce image quality for e-learning courses?
Some detail is removed, but at sensible settings the difference is not visible at normal viewing size.
How do I compress many images for e-learning courses at once?
Drop all of them into the tool together and use Download all to get a single ZIP.
Wrapping up
For Facebook posts, the reliable recipe is simple: resize to around 2048 pixels, compress at quality 78 or to a 400 KB target, and check the result before you upload. Keep the original so you can always start again.
Related guides
- How to Compress Images for Facebook Posts Without Losing Quality
Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.
- Batch Compressing Photos for Facebook Posts
When you have dozens of images, consistency matters as much as size.
- Why Your Images Are Too Large for Facebook Posts
If an upload keeps failing, the image is usually larger than it needs to be in more ways than one.
- Image File Size Checklist for Facebook Posts
Run through this list before you upload.
- How to Compress Images for Shopify Product Photos Without Losing Quality
Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.
- Why Your Images Are Too Large for Real Estate Listings
If an upload keeps failing, the image is usually larger than it needs to be in more ways than one.