Does the percentage mean quality or file size?

It is the target maximum file size relative to the original, not a fixed quality score. At 60%, a 10 MB image is compressed toward 6 MB or less, though the exact result depends on its content.

Can I target 100 KB, 1 MB, or another exact size?

Yes. Switch to target size and enter a limit in KB or MB. The compressor aims to stay under that limit, but a very small target may reduce resolution and no image encoder can guarantee the exact same byte count for every image.

Which formats are supported, and is PNG lossless?

JPG, PNG, and WebP are supported. JPG and WebP usually shrink the most. Significant PNG reduction lowers the color count, so it is not fully lossless; keep important originals separately.

Do my files get uploaded?

No. Compression runs entirely in your browser and your images never leave your device.

Compress Image

Choose a percentage or a target size in KB or MB

Drop your files here

Click to choose a file

Supported: PDF · JPG · PNG · WebP · MP4

Up to 50 files and 100 MB total per batch

Up to 50 MB per file

Compress JPG, PNG, and WebP images for faster page loads, marketplace upload limits, or smaller email attachments. JustFileKit processes every image directly in your browser, so your originals are never uploaded or stored on a server.

Drop your images in, then choose either a percentage of the original or a per-image limit in KB or MB. The recommended 60% setting balances file size and visual quality. Percentage mode keeps the original resolution; a very small fixed-size target may reduce image dimensions to approach the limit, and exact results still vary with image content.

Frequently asked questions

Does the percentage mean quality or file size?: It is the target maximum file size relative to the original, not a fixed quality score. At 60%, a 10 MB image is compressed toward 6 MB or less, though the exact result depends on its content.
Can I target 100 KB, 1 MB, or another exact size?: Yes. Switch to target size and enter a limit in KB or MB. The compressor aims to stay under that limit, but a very small target may reduce resolution and no image encoder can guarantee the exact same byte count for every image.
Which formats are supported, and is PNG lossless?: JPG, PNG, and WebP are supported. JPG and WebP usually shrink the most. Significant PNG reduction lowers the color count, so it is not fully lossless; keep important originals separately.
Do my files get uploaded?: No. Compression runs entirely in your browser and your images never leave your device.

Compress Image

Frequently asked questions

Related guides

More Image Tools

Compress Image

Frequently asked questions

Related guides

More Image Tools

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