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Compress image to 100 KB

Reduce photos to 100 KB or less, up to 10 at once for free. Each image keeps its format and dimensions and is lowered in quality only as much as it needs. Need another limit? Pick 50 KB, 200 KB, or type any size.

Add files to get started

How to compress an image to 100 KB

  1. Step 1

    Upload your images

    Add JPG, PNG, WebP, HEIC, or AVIF images from your device, a URL, Google Drive, or Dropbox. One photo or a full batch.

  2. Step 2

    Check the size limit

    100 KB is already set. Choose 50 KB, 200 KB, or 500 KB, or type the exact size an upload form or platform asks for.

  3. Step 3

    Compress and download

    Each image lands at or under the limit, and the list shows the size of every result. Download them one by one or as a ZIP.

What compressing to 100 KB changes

Quality is lowered only as needed

FastConvert searches for the highest quality that fits under the limit, image by image. A simple graphic may keep its quality while a detailed photo is compressed more. Images already under 100 KB keep the quality you chose.

Some images need fewer pixels

Very large or highly detailed photos can't reach 100 KB at their original dimensions without visible damage. FastConvert stops instead of degrading them. Turn on Resize if needed to reduce the dimensions only for those images, or raise the limit.

The format affects what fits

At the same size, AVIF and JPEG XL usually keep more detail than JPEG and WebP, but take longer to encode. Keep the original format when a form requires JPG; choose AVIF or WebP for websites. PNG reaches small sizes by reducing its color palette.

When a file size limit matters

Each setup can be saved as a recipe and applied again when the next batch arrives.

  • Online forms and applications

    Upload portals often reject photos and scans above a fixed size. Bring the whole set under it in one pass.

    Settings

    • Original format
    • Max 100 KB

  • Marketplace and CMS uploads

    Keep every product photo under the platform limit without testing a quality for each file.

    Settings

    • WebP preset
    • Max 200 KB

  • Lighter website pages

    Give each image a weight budget so a long page stays fast, whatever photos the next update brings.

    Settings

    • WebP preset
    • 1,600 px wide
    • Max 150 KB

Save the setup for your next batch

Preparing product photos every week? Save an image recipe to reuse them. A free account includes one recipe. Paid plans add larger batches, more recipes, and delivery to a selected Google Drive or Dropbox folder after you start each batch.

Compare batch limits and cloud delivery

Compress image to 100 KB FAQ

How do I compress an image to 100 KB?

Upload your image, keep the 100 KB limit that is already set, and select Compress images. FastConvert lowers the quality only as much as needed to stay at or under 100 KB, then you download the result. The list shows the final size of each image.

Can I compress several images to 100 KB at once?

Yes. The Free plan compresses up to 10 images per batch, each to its own quality so every file stays under the limit. Paid plans process larger batches and can save the setup as a recipe for the next set.

Why can't some images be compressed to 100 KB?

A large, detailed photo can need more than 100 KB even at a very low quality. Instead of returning a damaged image, FastConvert reports that the limit can't be reached at the current dimensions. Turn on Resize if needed, reduce the width and height in Batch settings, or raise the limit, and try again.

Which format keeps the most detail under 100 KB?

In our benchmark of 12 product photos under 100 KB, AVIF kept the most detail on every photo, followed by JPEG XL, then JPEG and WebP. AVIF and JPEG XL take longer to encode. Keep JPG when a form requires it.

Will my image keep its format and dimensions?

Yes, by default. With Original format selected, JPG stays JPEG and PNG stays PNG, and the pixel dimensions don't change. Choose the WebP, AVIF, or JPEG XL preset to convert while compressing, or enable resizing in Batch settings.

Can I compress an image to 50 KB, 200 KB, or 20 KB instead?

Yes. Pick 20 KB, 50 KB, 200 KB, 500 KB, or 1 MB, or type any size from 5 KB. Very small limits such as 20 KB usually also require smaller dimensions: turn on Resize if needed, or set the width and height a form requests in Batch settings. The compress image to 20 KB tool starts with 20 KB and Resize if needed turned on.

Is 100 KB measured as 100,000 or 102,400 bytes?

FastConvert treats 1 KB as 1,000 bytes, so a 100 KB result is at most 100,000 bytes. That also satisfies forms that count 1 KB as 1,024 bytes.

Does the image compressor work on phones, tablets, Mac, Windows, and Linux?

Yes. FastConvert works in a modern web browser on phones, tablets, and desktop computers, with no image app to install. Available upload and download choices can vary with the browser and device.

Are images uploaded to the image compressor private, and when are they deleted?

Yes. FastConvert transfers files over encrypted connections and stores originals and results temporarily for server-side processing and download. Files are kept for 24 hours on Free, 1 week on Basic, or 1 week on Pro, then scheduled for automatic deletion. We do not sell or rent personal data, use uploaded images for advertising, or use them to train general-purpose AI models. If you choose Google Drive or Dropbox, that provider supplies or receives the selected files as part of your request. No online service can guarantee absolute security.