How much smaller will my image get?

A phone photo at Light quality typically drops by half or more; Strong, which also caps the longest side at 2048 px, commonly takes 70-90% out. An image that is already well-optimized will report no change — that is correct behaviour, not a failure.

What quality should I use?

Recommended (72%) for anything that goes on a web page, Light (85%) when the image is the content and people will look closely, Strong (55%) for thumbnails and email attachments.

Can I compress a PNG without losing the alpha channel?

Yes. PNG stays PNG and keeps transparency; the size cut on flat-colour PNGs is smaller than on photos, because there is less redundancy to remove. Use Lossless PNG Optimization when the pixels must stay identical.

Why does my compressed JPG look blocky around the edges?

That is where the quality setting has gone too far for the image. Move the Custom slider up a few points, or lower the Max dimension instead — resizing costs fewer visible artefacts than a hard re-encode.

Compress Image

Smart compression with before/after size and quality preview.

Drag & drop images to compress

or click to browse — .jpg, .jpeg, .png, .webp, .gif, .bmp, .svg, .tiff, .tif, .heic, .avif, .ico · up to 50 files

Add at least one image.

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About Compress Image

Compress an image by re-encoding it at a lower quality setting, and see the before-and-after size of every file in the batch before you download anything. Three presets cover the ordinary cases, a custom slider goes where they do not, and if a re-encode would come out bigger than your original, the tool keeps the original and says so.

Photos that are too heavy for a form upload, a web page or an email.

How to use Compress Image in 3 steps

Drop the images you want to shrink onto the drop area.
Pick a Compression level — Light (85% quality), Recommended (72%) or Strong (55% with a 2048 px cap) — or Custom to set the quality yourself.
Compress and download, reading the size saved on each line of the result report.

What you get with Compress Image

Per-file size report, including the percentage saved
Max dimension slider (up to 4096 px) for photos that are simply too big
Never makes a file bigger: if re-encoding loses, your original is kept
Transparency is preserved on PNG, and JPG is flattened onto a solid background
Runs in your browser — the file is never uploaded
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Compress Image: questions

How much smaller will my image get?: A phone photo at Light quality typically drops by half or more; Strong, which also caps the longest side at 2048 px, commonly takes 70-90% out. An image that is already well-optimized will report no change — that is correct behaviour, not a failure.
What quality should I use?: Recommended (72%) for anything that goes on a web page, Light (85%) when the image is the content and people will look closely, Strong (55%) for thumbnails and email attachments.
Can I compress a PNG without losing the alpha channel?: Yes. PNG stays PNG and keeps transparency; the size cut on flat-colour PNGs is smaller than on photos, because there is less redundancy to remove. Use Lossless PNG Optimization when the pixels must stay identical.
Why does my compressed JPG look blocky around the edges?: That is where the quality setting has gone too far for the image. Move the Custom slider up a few points, or lower the Max dimension instead — resizing costs fewer visible artefacts than a hard re-encode.