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Compress Image to 400 KB
Compress an image to 400 KB or less, right in your browser. No signup, no queue, no upload.
No account · No daily limit · No card · Nothing to cancel
Full pixel size keptRe-encodes only if the file gets smaller Nothing is ever made bigger
The encoder works at a quality that does not show, and stops there. You do not pick a number.Your images are processed by your own browser. Nothing is uploaded, there is no account, and there is no daily limit.
Compress to another size
Every limit is different. These run on the same engine, so switching is instant.
At 400 KB you are hardly squeezing anything
400 KB is the size to pick when the picture will be shown big. A photograph seen full-width on a desktop monitor or a television is being viewed at many more pixels than a phone thumbnail, so the parts that compression damages become visible in proportion.
At this budget a photograph keeps the density it needs for a large display while still being a modest file to store or send.
Generous caps, and when you meet them
- A platform with a 400 KB limit
- Images intended for full-screen or television viewing
- Hero and banner photographs on a page
- Prints at A5 and above
Why a limit would sit this high
A ceiling of several hundred kilobytes is a courtesy limit, not a constraint. Print services, estate agents and camera-friendly platforms set it to stop someone uploading a 40 MB file over a phone connection, while still accepting a photograph with enough detail to work with. Files in this range are usually re-encoded once at high quality rather than compressed in any meaningful sense, and the metadata a camera writes into them — lens, location, timestamps, an embedded preview — is a large part of what disappears.
The result at 400 KB
High. The visible difference from the original is small at this size; what you lose is redundancy rather than detail.
Expect the result to be visually indistinguishable from your original. If your file is already under 400 KB, the tool hands it straight back rather than re-encoding it and losing quality for nothing.
How it works
- Add your imageDrop it above, or choose a file from your device.
- Choose howSmallest file keeps the best quality and takes no number, or set the exact size your form asks for. Nothing is compressed until you press Compress.
- Compress and downloadPress Compress, and the finished size is shown before you save, so there are no surprises.
Questions
How do I compress an image to 400 KB?
Drop your image into the box above, check that the target reads 400 KB, and press Compress. The finished size is shown before you download, so you can see that it fits before you save it.
Is 400 KB going to noticeably degrade my photo?
No. At this size you are inside the range where a single high-quality re-encode is invisible at normal viewing size, and much of what you save is camera metadata rather than picture detail.
Why compress at all if the limit is this generous?
Because the limit is still a limit. A modern phone photo can exceed 400 KB easily, and platforms that state a maximum reject anything above it rather than shrinking it for you.
Will compressing to 400 KB ruin the quality?
High. The visible difference from the original is small at this size; what you lose is redundancy rather than detail.
How does a 400 KB photo look on a large screen?
Good, and that is what this size is for. A photograph around 400 KB is intended to be viewed full-screen or on a TV rather than as a thumbnail, so the detail is kept rather than traded away.
Which format should I choose — JPG, PNG or WebP?
Photos: JPG or WebP, because they are built for photographs. Logos, signatures, screenshots and anything with flat colour: PNG, so the sharp edges stay sharp. If you are not sure, leave it on “keep original format”.
What does “400 KB or less” mean here?
The tool aims just below your number, never above it. If the image is already smaller than 400 KB it is left untouched rather than re-encoded and degraded.
Is this free? What is the catch?
There isn’t one. The compression runs inside your browser using technology already built in, so there is no server doing the work and nothing to charge for. This page shows ads, and that is the whole business model.
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