Free MB to KB converter

MB to KB Converter for Images

Compress image files from MB to KB with a target size you choose. This MB to KB converter runs in your browser, supports PNG, JPG, WebP, AVIF, and HEIC, and keeps every image on your device with no upload.

Browser localNo uploadPNG · JPG · WebP · AVIF · HEIC

Target image size

The MB to KB converter will try to compress each image to 500 KB or smaller.

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Actual output quality may be lower when the target KB is tight.

Drop images or click to upload

PNG, JPG, WebP, AVIF, and HEIC supported. Files stay in your browser.

Compress image to target KB

Set 100KB, 200KB, 500KB, 1MB, or a custom target KB size before dropping your image.

Best-effort size control

The converter searches quality levels first, then resizes only when needed to get closer to the target.

Private by design

Image compression happens locally in your browser. Your PNG, JPG, WebP, AVIF, or HEIC file is not uploaded.

Compress image to 100KB, 200KB, 500KB, or 1MB

Choose a preset target size when a form, marketplace, profile, or document portal asks for a strict image limit. The MB to KB converter keeps the workflow browser-local and tries to return a practical file at or below your selected KB target.

100KB target

Compress image to 100KB

Use 100KB for small avatars, profile photos, ID previews, and portals with tight upload limits.

200KB target

Compress image to 200KB

Use 200KB when you need a clearer photo while still keeping the image light enough for forms and email.

500KB target

Compress image to 500KB

Use 500KB for product images, website uploads, and larger photos that should keep more visible detail.

1MB target

Compress image to 1MB

Use 1MB when the image needs higher quality but still has to stay below a common upload-size ceiling.

Why use an image MB to KB converter?

A plain MB to KB calculator can tell you that 1 MB equals 1024 KB, but it cannot make an image smaller. This image MB to KB converter actually compresses image files, so you can reduce a 2 MB, 5 MB, or 10 MB photo to a target KB size for upload forms, email attachments, website images, profile photos, product listings, and application portals.

  1. 1

    Choose a target KB size

    Enter a custom target like 300 KB, or pick a preset such as 100KB, 200KB, 500KB, or 1MB.

  2. 2

    Drop PNG, JPG, WebP, AVIF, or HEIC images

    The MB to KB converter reads the file in your browser and starts compressing without uploading your image.

  3. 3

    Download the compressed image

    Save each compressed image or download all results as a ZIP when the target KB conversion is complete.

MB to KB conversion reference

For file-size math, this MB to KB converter uses the common binary relationship: 1 MB = 1024 KB. For real image compression, choose a target KB size in the tool above.

MBKBUse case
0.1 MB102.4 KBSmall avatars and form uploads
0.2 MB204.8 KBID photos and profile images
0.5 MB512 KBWeb images and email attachments
1 MB1024 KBLarger photos with more detail

After compression, create more with ImgPilot

Once your MB to KB image conversion is done, you can generate new visuals, edit a compressed image with AI, or turn an image into a short video.

Generate a new image

Use the AI image generator for product shots, thumbnails, posters, portraits, and concept art.

Open image generator

Edit an image with AI

Upload a reference image and describe the change: background swap, object edit, style change, or cleanup.

Open image editor

Turn image into video

Use image-to-video when a compressed product photo, poster, or visual needs motion.

Open AI video

MB to KB converter FAQ