What 300 KB can hold
A 300 KB file can be a sharp photo or a readable document, but not both at full size. As a rough guide:
- A photo at 1200 × 900 pixels saved as JPG often lands between 150 and 300 KB.
- A scanned A4 page at 150 DPI (about 1240 × 1754 pixels) usually fits in 200–300 KB if it is mostly text.
- A phone photo straight from the camera is often 2–5 MB, so it needs real compression to reach 300 KB.
If your image is a screenshot or a scan with fine print, expect to trade some pixel size for legibility. The tool shows the file size as you adjust, so you can stop when you hit 300 KB.
The order to try
- Pixels first. Reduce the longest edge to 1600–2000 pixels for a photo, or 1000–1400 pixels for a document. This alone often brings a phone photo close to 300 KB.
- Quality second. If the file is still over 300 KB, lower the JPG quality in small steps (for example 85 → 75 → 65). Check the preview after each step.
- Format last. Use JPG for photos and scans. PNG is better for logos and screenshots with flat colours, but PNG files are usually larger at the same pixel size, so switch to JPG if 300 KB is a hard limit.
Keeping faces and text legible
Faces suffer most from heavy compression. Keep the quality slider above 60 for portraits and group shots; below that, skin can look blotchy. If the face is small in the frame, crop closer before compressing rather than shrinking the whole image.
Text needs sharp edges. For documents, avoid going below 1000 pixels on the long edge. If the text is still fuzzy, raise the quality and lower the pixel count instead — a smaller but cleaner image reads better than a large, smeared one.
When the form also demands exact pixels
Some forms ask for a specific size, such as 600 × 600 pixels and under 300 KB. Do the pixel resize first, then compress. If the form gives a pixel range (for example 200 × 230 to 5000 × 5000), pick a size near the middle and check the file size.
Limits vary by form. Always read the form's own instructions — a passport portal, a job board and a marketplace listing can all set different rules for dimensions, file type and maximum size.
Quick reference
| Use case | Suggested long edge | Format | Typical result |
|---|---|---|---|
| Portrait or profile photo | 800–1200 px | JPG | 80–200 KB |
| Document or scan | 1000–1400 px | JPG | 150–300 KB |
| Product listing | 1200–1600 px | JPG | 150–300 KB |
| Logo or screenshot | 600–1000 px | PNG or JPG | 50–250 KB |
After you download
Open the file once to confirm it looks right at 100% zoom. Check the file size in your file manager or browser. If it is still over 300 KB, repeat the steps with a smaller long edge or lower quality. If it is well under, you can raise the quality slightly for a cleaner result.
Everything runs in your browser. The image is not uploaded, nothing is stored, and the tool works offline once the page has loaded.
Questions
How do I resize an image to exactly 300 KB?
Set the maximum file size to 300 KB, then adjust pixels and quality until the tool shows a size at or just under 300 KB. Exact byte-for-byte matching is not usually possible, but you can get within a few kilobytes.
Will compressing to 300 KB make my photo blurry?
It can if you shrink too much or drop quality too low. Start by reducing pixels to around 1200–1600 on the long edge and keep JPG quality above 60. Check the preview before downloading.
Should I use JPG or PNG for a 300 KB limit?
Use JPG for photos and scans. PNG is better for logos and flat graphics, but PNG files are often larger at the same pixel size, so switch to JPG if you need to hit 300 KB.
Is my image uploaded when I use this tool?
No. The tool runs entirely in your browser, so the image stays on your device. Nothing is uploaded or stored, and it works offline once the page has loaded.