Is the limit 100,000 bytes or a true 100 KB?

The target is 102,400 bytes, which is 100 x 1024, the true '100 KB'. The tool searches JPEG quality levels for the highest one that still fits under that, so the output reliably passes uploaders that check the byte count exactly.

My PNG had a transparent background. Why is it white now?

JPEG cannot store transparency, so any transparent areas are flattened onto a white background before encoding. Compressing to 100 KB always produces a JPG, so if you need to keep transparency this is not the right tool.

What if my image is too detailed to fit under 100 KB?

If even the lowest quality still overshoots, the tool falls back to that lowest-quality JPEG, which may end up slightly over the limit. Resize the pixel dimensions down first with Image Resize, since a 4000-px photo carries far more data than a 1200-px one, then compress for a clean result under 100 KB.

Does compressing a JPEG that is already compressed make it worse?

Yes. JPEG is lossy, so re-compressing a file that is already a saved JPEG stacks artifacts on top of artifacts. Start from the original source file whenever you can, rather than a copy that has been saved and re-saved.

Is my photo uploaded to a server to be compressed?

No. The quality search runs entirely in your browser and the file never leaves your device. That also means there is no server size cap on the input, so a 10 MB camera photo compresses fine.

I need 200 KB or 500 KB, not 100 KB. Can this tool do that?

This tool is fixed at 100 KB on purpose. Use the general Image Compressor for 200 KB, 500 KB, or 1 MB targets; it works the same way, finding the highest quality under whatever ceiling you pick.

Compress Image to 100KB

Compress any image to under 100KB precisely.

Choose an image

Processed in your browser — never uploaded, discarded after download.

What is Compress Image to 100KB?

Compress Image to 100KB does one job: it compresses a photo to under 100 KB in a single click, free and in your browser. Built for forms and uploaders that cap image size at 100 KB, it outputs a JPG kept as high-quality as that budget allows.

Key features

One-click compression to under 100 KB
Accepts any image and outputs a ready-to-upload JPG
Keeps quality as high as the size budget allows
Meets 100 KB upload limits on forms and portals

How to compress an image to under 100KB

Plenty of forms cap the images they accept at exactly 100 KB — government portals, visa and exam applications, older job boards, some school and banking uploaders. A photo straight from a phone is usually 2–6 MB, so it gets rejected, and guessing quality settings by hand is tedious. This tool has one job: take any image and hand back a JPG under 100 KB, in one click. It runs entirely in your browser — the photo is never uploaded.

The two steps

Choose an image. Any format your browser can open works — JPG, PNG, HEIC, WebP. A preview appears with the original file size shown.
Compress & download. The result downloads as yourname_compressed.jpg, and the panel shows the new size next to the original with the percent saved (for example 4.1 MB → 92 KB (-98%)).

How it hits the target

The tool doesn't just drop to a fixed low quality. It searches JPEG quality levels to find the highest quality that still lands under 100 KB, so you keep as much sharpness as the budget allows — a small logo might stay at high quality, while a detailed photo drops further. The target is a hard 102,400 bytes (100 × 1024), so the output reliably passes uploaders that check the byte count precisely.

Because the output is JPEG, any transparency is flattened onto a white background first. That's the right call for photos, but if you're compressing a logo or screenshot that relied on transparency, expect a white fill behind it.

When 100 KB isn't enough room

A very large or highly detailed image can be genuinely hard to fit under 100 KB. If even the lowest quality setting still overshoots, the tool falls back to that lowest-quality JPEG — which may end up slightly over the limit. If that happens, shrink the pixel dimensions first with the Image Resize tool (a 4000-px-wide photo has far more data than a 1200-px one), then compress. Fewer pixels give the compressor an easier target and a cleaner-looking result at 100 KB.

Why JPEG, and a note on re-compressing

The output is always JPEG because that's what makes hitting a small byte budget practical — JPEG's quality dial trades detail for size in fine steps, which is exactly what the search needs. PNG, being lossless, often can't get a photo under 100 KB at all. The flip side: JPEG is lossy, so compressing an image that's already a heavily-compressed JPEG stacks artifacts on artifacts. Whenever you can, start from the original file (straight from the camera or the source), not a copy that's been saved and re-saved.

Text-heavy screenshots and line art are the awkward case here — JPEG smears the sharp edges of text into a soft halo. For those, resizing down or converting to PNG usually serves better than squeezing to a 100 KB JPEG, unless the form specifically demands a JPG under 100 KB.

Other size limits

This tool is locked to 100 KB on purpose. If your form needs a different ceiling — 200 KB, 500 KB, or 1 MB — use the general Image Compressor, which offers those targets and works the same way: finding the best quality under whatever limit you pick.

Frequently asked questions

Is the limit 100,000 bytes or a true 100 KB?: The target is 102,400 bytes, which is 100 x 1024, the true '100 KB'. The tool searches JPEG quality levels for the highest one that still fits under that, so the output reliably passes uploaders that check the byte count exactly.
My PNG had a transparent background. Why is it white now?: JPEG cannot store transparency, so any transparent areas are flattened onto a white background before encoding. Compressing to 100 KB always produces a JPG, so if you need to keep transparency this is not the right tool.
What if my image is too detailed to fit under 100 KB?: If even the lowest quality still overshoots, the tool falls back to that lowest-quality JPEG, which may end up slightly over the limit. Resize the pixel dimensions down first with Image Resize, since a 4000-px photo carries far more data than a 1200-px one, then compress for a clean result under 100 KB.
Does compressing a JPEG that is already compressed make it worse?: Yes. JPEG is lossy, so re-compressing a file that is already a saved JPEG stacks artifacts on top of artifacts. Start from the original source file whenever you can, rather than a copy that has been saved and re-saved.
Is my photo uploaded to a server to be compressed?: No. The quality search runs entirely in your browser and the file never leaves your device. That also means there is no server size cap on the input, so a 10 MB camera photo compresses fine.
I need 200 KB or 500 KB, not 100 KB. Can this tool do that?: This tool is fixed at 100 KB on purpose. Use the general Image Compressor for 200 KB, 500 KB, or 1 MB targets; it works the same way, finding the highest quality under whatever ceiling you pick.

Privacy

Finding the right JPEG quality for your 100 KB target is done entirely in your browser; the original photo is never uploaded.