Reduce a large source photo before adding it to a website.
Exact size image compressor
Compress image to 300KB
Create a lighter image below 300KB for websites, documents, and everyday uploads.
Compress image to 300KB →Create a manageable image file for a digital document.
Keep more detail than a very small form-size target.
How to compress an image to 300KB
Set the 300KB target, add one image or a batch, and download the optimized result once it is ready.
- Open the TargetKB compressor with the 300KB limit already selected.
- Upload one image or up to 10 images at once.
- Download the optimized image and check its dimensions and file size before uploading.
Why use an exact-size compressor?
Many upload forms reject files for being only slightly too large. TargetKB works backwards from your requested limit, automatically balancing image dimensions and JPEG quality instead of asking you to guess a quality percentage.
Check byte limits, output quality and format limitations if your upload is still rejected.
Frequently asked questions
Can I compress HEIC photos to 300KB?
Yes. TargetKB supports HEIC conversion and compression in compatible browsers.
How many images can I process?
You can upload and compress up to 10 images at once.