Resize to 20KB (320px)
Lock your image to 320 pixels maximum and compress to 20KB — producing sharp, uniformly-sized thumbnails perfect for mobile profiles, ID badges, gallery grids, and email newsletters.
✨ Compression Complete
Your image has been optimized — here's the breakdown
Resizing Images to 20KB at 320 Pixels Maximum
The 320-pixel constraint locks the longest dimension of your image to exactly 320 pixels before compression. This produces consistently-sized thumbnails that are ideal for mobile profile pictures, badge photos, and grid-layout galleries where uniform dimensions matter as much as file size.
- 320 pixels is the standard width for mobile-first web design — it matches the viewport of smaller smartphones and ensures your image fills the screen edge-to-edge
- Locking the dimension before compression gives the JPEG encoder more quality budget — a 320×240 image at 20KB retains significantly more detail than a 640×480 image at 20KB
- Aspect ratio is always preserved: a landscape photo becomes 320×240, a portrait becomes 240×320, and a square stays 320×320
- This dimension is optimal for profile photos, ID badges, and any context where the image will be displayed at a small physical size
How 320px + 20KB Compression Works
This tool applies a two-phase optimization: first scaling to 320px maximum, then compressing to fit within 20KB:
1. Dimension Scaling
- Your image is scaled so the longest side is exactly 320 pixels
- Bicubic interpolation ensures smooth downscaling without jagged edges
- Aspect ratio is strictly preserved — no stretching or cropping occurs
Where 320px Thumbnails Are Used
The 320-pixel standard appears across mobile apps, web platforms, and official document systems:
Mobile Profile Avatars
Social media apps and messaging platforms display profile pictures at 320×320px or smaller. Uploading at this exact size avoids server-side resampling artifacts.
ID Badge & Access Card Photos
Corporate ID badges and building access cards use small printed photos. A 320px image at 300 DPI prints at approximately 1 inch — perfect for badge inserts.
Photo Grid & Gallery Thumbnails
E-commerce product grids, portfolio galleries, and image search results display thumbnails at 320px. Pre-sizing saves bandwidth and improves load times.
Email Newsletter Images
Email clients often render images in narrow columns. A 320px-wide image fits perfectly in single-column mobile email layouts.
Gaming & App User Icons
Game leaderboards, forum avatars, and app user icons display at 320px or below. Optimizing to 20KB keeps the app responsive.
Document Embedded Photos
Photos embedded in Word documents, Excel sheets, and presentations benefit from 320px sizing — large enough to be recognizable, small enough to keep the document lightweight.
Frequently Asked Questions
Common questions about this specific tool
320px is the standard mobile viewport width and the most common thumbnail size across web platforms. It provides a good balance between visual detail and file size.
If your image is already 320px or smaller on both sides, the tool will not upscale it. It will only compress the file size to fit within 20KB at the original dimensions.
This tool is specifically optimized for 320px output. For custom dimensions, use the main Resize to 20KB tool and manually crop or resize your image beforehand.
No — the tool only scales (shrinks) your image proportionally. The full image content is preserved; nothing is cropped. A 1920×1080 photo becomes 320×180.
At 300 DPI, 320px prints at approximately 1.07 inches — suitable for ID badges, business cards, and small printed photos. For larger prints, you'd need higher resolution.
By scaling first, we reduce the pixel count dramatically. The JPEG encoder then has more quality budget per pixel — meaning a 320×240 image at 20KB looks much sharper than a 640×480 image compressed to the same 20KB.