Increase Image Size in KB Online — Free Photo KB Increaser
Grow unlimited photos to exactly 20KB, 50KB, 100KB — or any size you choose. Built for exam forms and job portals that reject photos below their minimum KB. Everything runs in your browser: no upload, no signup, no watermark.
Drag & drop your images here
or click to browse — JPG, PNG, WebP. Add as many as you like. Files stay on your device.
Files never leave your device—
Or set a custom target size (KB):
How this works: each photo is re-encoded at full JPEG quality first. If it's still under your target, dimensions are gently upscaled until the file reaches the target KB. Your photo keeps its sharpness — nothing is ever compressed here.
How to increase an image's size in KB
- Drop one or many photos into the box above (or click to browse).
- Pick the 50 KB preset — or 20KB / 100KB / 200KB / custom.
- Click Increase Images and download each file — or everything as one ZIP.
Why forms reject photos that are "too small"
Most exam and government portals don't just set a maximum file size — they set a range, like "photo between 20KB and 50KB". A scanned photo that's only 12KB gets rejected even though it's "under the limit", and the error message rarely explains why. Resizing the photo smaller makes it worse. This tool works the other way: it re-encodes your photo at full quality (which alone often adds KB), and if the file is still under your target, it carefully upscales the dimensions until the file reaches exactly the KB you picked. The result passes the portal's minimum check with no quality loss — the pixels you had stay the pixels you had. Like every PDFPax tool it runs entirely in your browser with the Canvas API: no server, no queue, no account, no watermark, and it keeps working offline once the page is loaded.
Frequently asked questions
How do I increase an image's size to 50KB?
Drop your photo in, keep the 50KB preset and click Increase Images. The tool grows the file to 50KB or slightly over, then gives you the download. If your photo is already above 50KB, it's left untouched.
Will my photo look blurry after the size is increased?
No. The tool never lowers quality — it encodes at full JPEG quality and only upscales dimensions when needed. Upscaling can't invent detail, so a tiny photo enlarged a lot may look soft at full zoom, exactly like any resized image.
Can I increase the KB of many photos at once?
Yes — add as many photos as you like. Each is grown to your target size, and you can download them individually or all together as one ZIP file.
What if my photo is already bigger than the target?
Then nothing needs doing — the tool tells you the file already meets the target and hands you the original back unchanged.
Is there a daily limit?
No. Files never leave your device, so there's nothing to meter — increase as many images as you want, as often as you want.