How do I compress an image to an exact size like 100 KB?

Drop your image onto the upload zone (or click to browse, or paste with Ctrl+V / Cmd+V), choose JPEG or WebP, then click a target such as 100 KB (or type a custom value). The tool binary-searches the quality and downloads a file under your target. It is completely free and runs entirely in your browser, so your image is never uploaded.

Is compressing an image to a specific file size free?

Yes — hitting an exact file-size target (like 100 KB or 500 KB) with JPEG or WebP is completely free, forever. No account, no sign-up, and no limit on how many images you compress. The binary-search compression runs entirely in your browser; your images are never uploaded to any server. The site is ad-supported.

Are images uploaded to a server?

No. All processing runs entirely in your browser; images never leave your device. This is the core design principle of the tool.

Which target sizes are available?

Presets for 50 KB, 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, and 5 MB, plus a custom KB field for any other target.

How is this different from the Compress tool?

The general Compress tool lets you tune quality and convert formats freely. This tool is focused only on hitting an exact size target as closely as possible, with one-click presets and a clear before/after size.

Why can't I compress a PNG to a target size?

PNG is lossless and the browser ignores the quality parameter for it, so a size target can't be reached by adjusting quality. Use JPEG or WebP, which support quality-based compression.

What if my target is smaller than the image can reach?

The tool returns the smallest version it can produce and tells you the target was below what the image can reach without heavy damage. Try a larger target or a smaller starting image.

Does it work offline?

Yes. Compression uses the Canvas API and needs no server connection, so it works offline after the page loads.

Compress Image to a Target Size

Compress to Size is a free browser-based tool that shrinks a JPEG or WebP to an exact target file size. Pick a target (50 KB, 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, 5 MB, or a custom value) and a binary search finds the highest quality that fits in 8 passes or fewer — all on your device, with no upload, working offline.

Compress a JPEG or WebP to an exact KB or MB target directly in your browser — free, no upload required.

100% Free — Forever. No fees, ever.
Private: files are processed locally in your browser and never sent to a server.
No upload, no account, no sign-up.

How do I compress an image to an exact size like 100 KB?: Drop your image onto the upload zone (or click to browse, or paste with Ctrl+V / Cmd+V), choose JPEG or WebP, then click a target such as 100 KB (or type a custom value). The tool binary-searches the quality and downloads a file under your target. It is completely free and runs entirely in your browser, so your image is never uploaded.
Is compressing an image to a specific file size free?: Yes — hitting an exact file-size target (like 100 KB or 500 KB) with JPEG or WebP is completely free, forever. No account, no sign-up, and no limit on how many images you compress. The binary-search compression runs entirely in your browser; your images are never uploaded to any server. The site is ad-supported.
Are images uploaded to a server?: No. All processing runs entirely in your browser; images never leave your device. This is the core design principle of the tool.
Which target sizes are available?: Presets for 50 KB, 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, and 5 MB, plus a custom KB field for any other target.
How is this different from the Compress tool?: The general Compress tool lets you tune quality and convert formats freely. This tool is focused only on hitting an exact size target as closely as possible, with one-click presets and a clear before/after size.
Why can't I compress a PNG to a target size?: PNG is lossless and the browser ignores the quality parameter for it, so a size target can't be reached by adjusting quality. Use JPEG or WebP, which support quality-based compression.
What if my target is smaller than the image can reach?: The tool returns the smallest version it can produce and tells you the target was below what the image can reach without heavy damage. Try a larger target or a smaller starting image.
Does it work offline?: Yes. Compression uses the Canvas API and needs no server connection, so it works offline after the page loads.

The tool uses a binary search over JPEG/WebP quality values, converging on the target in at most 8 passes.
JPEG and WebP support quality-based lossy compression; PNG is lossless and cannot be driven to an arbitrary size by quality, so it is excluded.
WebP typically reaches a given size at higher visual quality than JPEG, so switching to WebP can help when a target is hard to hit.
The Canvas API toBlob() method used for encoding is specified by the W3C HTML Living Standard and supported in all modern browsers.
Because the search runs client-side, the image is never uploaded, so size-limited documents stay private.

🗜️ Compress Image to a Target Size

Compress Image to a Target Size