Compress an image to 300 KB

FreeNo uploadNo signupWorks offline

Plenty of portals and application forms only accept images under 300 KB. Drop your photo and get the best-looking version that fits - the tool finds the highest quality under the limit automatically, on your device.

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How to use Compress Image to 300KB

Compress Image to 300KB – Get any photo under 300 KB for upload forms. Free, no upload.

Choose or drop your image.
Keep the 300 KB target, or type a different limit.
Click Compress.
Check the final size and dimensions, then download.

Supported formats

Input: JPG, PNG, WebP, HEIC, AVIF
Output: JPG

What fits in 300 KB

Plenty for any ID photo, and enough for a photographed multi-line document that stays legible when an officer zooms in. A full-page scan at 200 dpi lands near this figure, which is why 300 KB turns up so often as the cap on document uploads rather than photo uploads - it is roughly the size of one honest page of scanned paper.

Getting the best result at this size

At this size the usual failure is the wrong dimensions, not the wrong file size, so confirm the pixel size the portal expects before you worry about KB at all. If you are uploading a scanned document, check the result at 100% zoom before submitting: a file that slips under the limit but cannot be read is rejected later by a person, which costs far more time than redoing the scan now.

How the target is reached

The image is saved as a JPG at the highest quality that still fits in 300 KB (counted as 300,000 bytes), found by trying successive quality levels. Only if quality alone cannot get there is the image scaled down, in steps, keeping its proportions. The exact final size and dimensions are shown when it finishes.

Limitations

The result is a JPG, so transparent areas in a PNG become white.
A heavily cropped or very detailed image may need to be scaled down to fit.
The tool checks size, dimensions and format - not whether the photo itself meets a form’s rules on pose, lighting or how recent it is.

Privacy

Files you choose are read into your browser’s memory and processed on your device; they are not uploaded to a server. Temporary download links are released after use, and the offline cache never stores your documents. More about privacy and limits.

Frequently asked questions

Will the file be exactly 300 KB?

It will be at or just under 300 KB - the largest, best-quality file that fits.

Will the dimensions change?

Only if they have to. Most images reach the target on quality alone, and the result shows the final width and height so you can check against the form.

Does the form count 1 KB as 1000 or 1024 bytes?

Forms differ, and most do not say. The result is kept under the limit counted as 1000 bytes, so it also passes a form that counts 1024.

Is my file uploaded anywhere?

No. The file is read into your browser and resized on your device. Nothing is sent to a server, which matters when the file is an ID photo or a signed form.

Is it free?

Yes - free, with no signup, no watermark and no daily limit.