How to Get a JPEG Under 400 KB for Facebook Posts
Hitting an exact size limit is easier with a target-size compressor. 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 Get a JPEG Under 400 KB
Type 400 into the target size box. The tool tries different quality levels and keeps the best one that fits. If even low quality cannot fit, it gradually reduces the dimensions until it does.
For very tight limits, crop first so the subject fills the frame. A tightly cropped image at 400 KB will look far better than a wide scene squeezed to the same size.
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
- Use WebP where it is supported and you control the page.
- Never re-compress an already compressed JPEG if you can avoid it.
- Strip metadata from images you share publicly.
- Always keep the original file and compress a copy.
FAQ
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.
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.
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
- Does Compression Affect Image Quality for Facebook Posts?
Yes, but how much depends on your settings.
- Fixing Blurry Images After Compressing for Facebook Posts
Blurriness after compression usually comes from resizing too far, not from JPEG itself.
- Should You Strip EXIF Data From Images for Facebook Posts?
Photos carry hidden metadata such as camera model, date and sometimes GPS location.
- Choosing Image Dimensions for Facebook Posts
Dimensions decide how sharp an image looks and how heavy it is.
- Does Compression Affect Image Quality for Shopify Product Photos?
Yes, but how much depends on your settings.
- Should You Strip EXIF Data From Images for Real Estate Listings?
Photos carry hidden metadata such as camera model, date and sometimes GPS location.