Resize Image to 20KB
Resize an image down to 20KB or less. The tool adjusts compression first and dimensions second, so your picture stays as large as the size limit allows.
Your images are processed in your browser and never uploaded to our servers.
Drop your image here
or click to browse — JPG, PNG, or WebP
Your image is processed locally in your browser and never uploaded.
How to Resize an Image to 20KB
- Choose or drop your jpg, png, webp image file.
- Use the prefilled 20KB target and adjust compression mode if needed.
- Review the compressed size, quality, and output dimensions in your browser.
- Download the WebP file when the result is within the selected target.
What 20KB Means for Dimensions and Quality
20KB is the size most commonly requested by online application forms for passport-style photographs. It is tight but workable: a headshot at roughly 400×500 pixels usually lands in this range while remaining clear enough for a human reviewer to identify the subject.
The distinction that matters at 20KB is between simple and complex images. A face against a plain background is simple, and compresses gracefully. The same face against a crowded street will need either a crop or a resize, because the background is competing for the same limited bytes.
Use this page when a form, upload field, or style guide specifies 20KB and you need the file to meet it without becoming unusable.
Why Dimensions Do Most of the Work at 20KB
At 20KB there is not enough budget for the compressor to solve the problem alone. If you hand it a 12-megapixel photograph, it has roughly 1.7 bytes per thousand pixels to work with — far below what any encoder needs to produce a recognisable image. Dimensions have to come down first, and substantially.
As a rough guide, a photograph will generally need to be around 400 pixels on its long edge to sit comfortably at 20KB with quality intact. Simple graphics with flat colour can be several times larger than that. Start by resizing to those ranges and let the compressor make the final adjustment, rather than asking it to close a gap of two orders of magnitude by quality alone.
Source Size Versus Result at 20KB
| Source image | What to expect |
|---|---|
| 4032×3024 phone photo | Resize to ~1200px wide, then compress to 20KB |
| 1920×1080 screenshot | Usually reaches 20KB with no resize at all |
| Square 2000×2000 product shot | Resize to roughly 1000px for a comfortable margin |
| Wide 5000×1200 banner | Wide ratios carry many pixels; crop or resize substantially |
Who Searches for Image Resizing
People told to "resize" by a form
Upload forms use the word loosely. If the instruction gives a number in KB or MB it means file size; if it gives two numbers with an × between them it means pixel dimensions.
Anyone whose resize did not help
Reducing dimensions in an image editor and re-saving at maximum quality often barely changes the file size. The quality setting has to move too, which is what this tool handles.
Bulk web publishing
Content teams preparing images for a CMS need both dimensions and weight under control, since one without the other still produces a slow page.
How Each Input Format Behaves
This page accepts JPG, JPEG, PNG, and WebP inputs, which covers essentially every image you are likely to encounter outside of specialist workflows. Each behaves a little differently under compression, and the tool adapts to what you give it.
Output is always WebP. That choice is deliberate: WebP reaches a given target size at higher visual quality than JPG or PNG can, which means the file you download looks better than the equivalent-sized file in an older format would.
Upload JPG, JPEG, PNG, or WebP images. Downloads are optimized WebP files.
JPG sources are already lossy
A JPG has been compressed once already. Converting it to WebP is a second lossy pass, so always start from the highest-quality version you have.
PNG sources compress dramatically
PNG is lossless and therefore large. Converting a PNG to WebP frequently produces the biggest reduction you will see, especially for screenshots and graphics.
WebP sources have less to give
An existing WebP is already efficiently encoded, so reaching a much smaller target usually requires reducing dimensions rather than quality alone.
Recommended Settings for 20KB
Use Balanced mode with resize enabled at roughly 500px on the long edge. If the form also specifies dimensions in pixels, crop to those dimensions first, then compress — compressing before cropping wastes bytes on parts of the image you are about to discard.
For very small targets, start with a smaller image width and use the Smallest File mode if the image has lots of detail.
Resizing Mistakes That Cost You Quality
Resized but still too large
Dimensions alone rarely close the gap. A 500px image saved at maximum quality can still exceed 20KB; the compression setting has to come down as well.
Stretched or squashed result
Forcing a specific width and height without matching the original ratio distorts the picture. Crop to the required ratio first, then resize.
Enlarging to hit a dimension
Scaling a small image up adds pixels without adding detail, producing a soft result and a larger file. Start from the largest original you have.
Other Image Size Compressors
Same-size pages
FAQs
Can I compress an image to 20KB exactly?▼
The tool aims for 20KB or less. Some images may finish slightly below the target, and very detailed images may need stronger compression or resizing.
Can I compress images below 20KB?▼
Yes. Choose a smaller target page or use stronger compression settings when you need a file below 20KB.
Are my images uploaded to a server?▼
No. Images are processed locally in your browser and are never uploaded to our servers.
Will compression reduce image quality?▼
Compression can reduce visual quality, especially at very small targets. The tool balances file size, quality, and dimensions to keep the result usable.
What happens if my image cannot reach 20KB?▼
You will see a helpful message with options such as reducing width, using a stronger compression mode, or choosing a higher target size.