What 30 KB can hold
30 KB is a small budget. A JPEG at 30 KB is usually fine for a head-and-shoulders portrait or a scanned signature, but it will not hold a detailed landscape or a full page of dense text.
Approximate pixel sizes that often land near 30 KB:
| Content type | Typical pixels | Notes |
|---|---|---|
| Portrait photo | 300 x 400 to 600 x 800 | Face stays recognizable at the smaller end |
| Signature scan | 400 x 200 to 600 x 300 | Keep the stroke edges crisp |
| ID or document photo | 600 x 400 to 800 x 600 | Text may soften below 600 px wide |
| Thumbnail | 150 x 150 to 200 x 200 | Plenty of headroom at 30 KB |
These are starting points, not guarantees. A busy photo needs more pixels than a plain background, and a noisy scan needs more than a clean one.
Order of operations
- Set pixels first. The pixel dimensions decide how much detail exists. Cut them before touching quality, because a smaller image compresses more predictably.
- Choose JPG. For photos and most scans, JPG reaches 30 KB at higher visual quality than PNG. Use PNG only if the form explicitly asks for it and you can meet the size.
- Lower quality last. Move the quality slider down in small steps and watch the estimated size. Stop as soon as you are under 30 KB.
If the form also demands exact pixel dimensions, set those numbers first and treat quality as the only variable. If the exact dimensions push the file over 30 KB, reduce quality until it fits. If it still will not fit, the form's two requirements may conflict; check the form's own instructions before guessing.
Keeping faces and text legible
For a face, keep the eyes and the jawline sharp. A portrait at 400 x 500 with moderate quality usually reads better than a 200 x 250 version at maximum quality, because the extra pixels carry the features.
For a signature or a line of text, avoid heavy compression. Text and thin strokes show blocky edges sooner than skin tones do. If a signature looks ragged, raise the pixel width and lower quality instead of shrinking further.
For a document scan, crop to the region the form needs. Cropping removes empty margins, which cost bytes without adding information.
When the form has its own rules
Application portals often state a maximum file size, a minimum and maximum pixel size, and a required format. Those limits vary by form. Read the form's instructions and match them exactly; a file that meets 30 KB but misses the pixel range may be rejected.
Common combinations you may see:
- Photo: 30 KB maximum, JPG, roughly 200 x 230 pixels.
- Signature: 20-30 KB, JPG, roughly 140 x 60 pixels.
- Document: 30 KB per page, JPG or PDF.
If the form asks for PDF, export the compressed JPG into a PDF after resizing. The PDF will be slightly larger than the JPG, so leave a little headroom.
Checking the result
Open the downloaded file at 100% zoom. Check the face or the text you care about. Then confirm the size in your file manager or by right-clicking the file and choosing properties. If it is over 30 KB, go back and lower quality by another step.
Why this page works offline
The tool runs entirely in your browser. Images are never uploaded, nothing is stored, and there is no sign-up and no watermark. Once the page has loaded, you can keep working without a connection.
Questions
How do I resize an image to 30 KB?
Open the image in the compressor, set the format to JPG, lower the pixel dimensions, then reduce quality until the estimated size is near 30 KB. Download and check the file size.
What pixel size is 30 KB?
It depends on the content. A portrait often fits at 300 x 400 to 600 x 800 pixels, while a signature may fit at 400 x 200. Busy images need fewer pixels than simple ones.
Should I use JPG or PNG for a 30 KB file?
Use JPG for photos and most scans, because it reaches 30 KB with better visual quality. Use PNG only if the form requires it and you can meet the size limit.
Why is my image still over 30 KB after resizing?
The pixel dimensions may still be too large, or the quality is too high. Lower the quality in small steps, and crop empty margins if the form allows it.