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Compress image from MB to KB

Your photo weighs megabytes and the form wants kilobytes: that is the job for this MB to KB converter. Type the KB figure into the open size field, or tap a chip, drop the photo, and it comes back at or under the number. Part of the image compressor.

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JPEG · PNG · WEBP · AVIF · HEIC · up to 50 at once · max 30 MB each

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Auto tunes each image.

A hard cap for the number your form demands.

A floor for forms that refuse small files.

Max resolution

Empty side keeps the ratio. Never enlarges.

Every size target, one guarantee

A page for each number, arriving with the cap already armed. Under it, or a clear error, and never over.

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In megabytes

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Image compressor, before: the original photograph, 9.8 MBOriginal · 9.8 MB
Image compressor, after: the same photograph as AVIF, 97.1 KBAVIF · 97.1 KB
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The engine behind the cap, on a real photograph: 9.8 MB in, 97.1 KB out. Your file gets the same treatment with your size limit as the hard ceiling.

How do I compress an image from MB to KB, at or under the KB I type?

A 0 to 120 KB scale with a 100 KB cap typed in: our 9.8 MB camera photo came back at 97.3 KB, under it, with all 4964×2782 pixels kept. The result prints its exact size.

Type the kilobyte figure into the Max file size field, open under the drop zone with KB selected, or tap a chip, then drop the photo. The engine binary-searches quality for the most detail that fits at or under that number. It shrinks the dimensions only if no quality setting can get there. JPEG output is preselected because a JPEG is what turns megabytes into kilobytes; a PNG of the same photo has only a palette to trim. The result prints its exact size, so you can read the KB figure off the row before you upload it.

How many KB is 1 MB, and does the portal count 1,000 or 1,024?

How many KB are in 1 MB, counted two ways: 1,000 by the decimal definition NIST gives for kilo and mega, 1,024 by the binary kibi and mebi. The field here counts 1,000 bytes per KB, so a file under its cap is under either count.

1,000 KB by the decimal definition, 1,024 by the binary one, and both are live. NIST's page on binary prefixes gives kilo as 1,000 and mega as 1,000,000. It names the binary steps kibi and mebi, 1,024 and 1,048,576. Most software still prints the binary count as KB and MB. Apple's storage note says current Apple systems report sizes in decimal while older ones reported binary. So one file can read as two different numbers on two screens. The field here counts 1,000 bytes per KB, and a file at or under that count is under the limit whichever way the portal counts. The scale of the job is the same either way: our 9.8 MB camera photo lost 99 percent of its bytes to reach 97.3 KB.

How much is 3,000 KB in MB?

3 MB, counting 1,000 KB to the megabyte as the size field does. Software that counts in 1,024s reads 3,000 of its own kilobytes as 2.93 MB. Either way, a 3,000 KB photo has to lose most of its bytes to meet a 100 KB rule.

How far can a photo shrink before it looks worse? 9.8 MB to every KB cap, measured

A hundredfold, with every pixel, at 100 KB. The camera photo dropped from 9.8 MB to 97.3 KB, 101 times smaller, without losing a pixel of its 4964×2782. From 60 KB upward the engine never had to touch the dimensions. At 50 KB it did, bringing the picture to 1371×768 to fit. Below that line the picture gets smaller as well as lighter, which is the one thing a slider tool never tells you. The PNG in the last row, our reference photo saved as PNG, is the other route from megabytes to kilobytes: 84 times smaller as a JPEG under a 50 KB cap.

SourceCapResultDimensionsWhat the engine did
Camera photo50 KB39.7 KB1371×768quality search, then a downscale
Camera photo100 KB97.3 KB4964×2782quality search alone
Camera photo200 KB194.8 KB4964×2782quality search alone
Camera photo500 KB497.7 KB4964×2782quality search alone
Camera photo1 MB996.5 KB4964×2782quality search alone
4.1 MB PNG50 KB48.7 KB1920×1280converted to JPEG on the way under the cap

Sources: source.jpeg, 9.8 MB at 4964×2782, through Max file size at each cap with the engine's defaults, and photo.png, our reference photo saved as PNG, 4.1 MB, converted to JPEG under a 50 KB cap. Each row is the file the engine produced.

Every byte count is the size of the actual file our engine produced from the named source, the same bytes you would download, not an estimate. The reference photo is one of our own photographs, an iguana on a branch, and the camera photo is a real one too. Drop your own file into the tool above to rerun any of them. How we measure names the sources and the settings.

PNG photo to KB: convert it first, then cap it

Our reference photo saved as PNG, 4.1 MB, at Auto in four formats: 994.3 KB as PNG, 273.9 KB as JPEG, 218.9 KB as WebP and 123.9 KB as AVIF. The PNG could shed only its palette; the other three spent quality.

A PNG in megabytes is often a photo saved in the wrong format, and for a photo the format is the fix. At Auto, our reference photo saved as PNG, 4.1 MB, came out at 994.3 KB as a PNG. As a JPEG it was 273.9 KB, as WebP 218.9 KB and as AVIF 123.9 KB. The PNG could shed only its palette; the other three could spend quality, which is where the kilobytes are. JPEG output is preselected on this page, so the conversion happens in the same pass as the cap. Keep PNG for a graphic or a screenshot of text, where hard edges must stay exact, and expect it to fight a kilobyte cap.

MB to KB converter, 1 MB to KB, 2 MB to KB: one field, any number

Five ways people ask for it, compress image from MB to KB, 3,000 KB in MB, 1 MB to KB, 2 MB to KB and MB to KB converter, all arriving at one size field that takes any KB figure.

An MB to KB converter for images is this page: it does not convert a unit, it makes the file that size. 1 MB to KB is 1,000 KB, 2 MB to KB is 2,000 KB and 3,000 KB in MB is 3 MB, and knowing that does nothing for a form that rejects your photo. Type the KB figure the form states into the open size field and drop the photo: it comes back at or under the number, whatever it weighed in megabytes. The arithmetic is decimal here, 1 KB being 1,000 bytes, the same unit the portals count in.

Which KB sizes do forms want?

Which KB sizes forms want: India's GST registration guide asks for the promoter's photograph as a JPEG of at most 100 KB, and proofs on the same application of up to 1 MB. Each common number has a page with the cap armed: 50 KB, 100 KB, 200 KB, 300 KB, 1 MB.

Tens to hundreds of kilobytes, and sometimes both units on one form. India's GST registration guide wants the promoter's photograph as a JPEG of at most 100 KB. The proofs on the same application may be PDFs or JPEGs of up to 1 MB. The kilobyte page carries the sourced table of portal windows, exam photos included. Each number also has a page of its own with the cap armed on arrival, such as compress image to 100 KB and compress image to 1 MB.

Is it safe to upload documents here?

Four steps for a photographed ID: drop it with no account needed, EXIF and GPS come off the output so it no longer carries the room it was shot in, a plain JPEG under the cap comes back, and the files are wiped automatically.

Yes. Every output leaves without its EXIF and GPS, so a photographed ID stops carrying the location of the room it was shot in. We keep nothing: files are processed and wiped automatically, and no account is needed. A JPEG under the cap is exactly the plain file a portal's upload check expects.

When MB to KB is the wrong move

  • The field says 1 MB or 2 MB?

    That is a megabyte cap, not a kilobyte one. Switch the unit to MB, or use the megabyte page, where the photo keeps every pixel.

  • A web image that wants pixels?

    Set Max resolution in the same panel, or use the resize tool. The bytes follow the pixels down without a cap.

  • A graphic that must stay PNG?

    Pick PNG in the format picker; the cap trims the palette instead. Line art survives it, a photograph does not.

  • Only the arithmetic?

    1 MB is 1,000 KB in decimal and 1,024 in binary. No file needed.

Kilobyte caps and the portal windows: Reduce image size in KB. Megabyte caps: Reduce image size in MB. Pixels: Resize image.

Questions, answered

The panel is already open above. One drop settles most of these.

Can I compress any image file from MB to KB?

Any photograph, yes. Our 9.8 MB camera photo reached 97.3 KB under a 100 KB cap with every pixel kept. Our reference photo saved as PNG, 4.1 MB, reached 48.7 KB as a JPEG under 50 KB. A screenshot or a graphic gets there once it leaves PNG for JPEG or WebP. Files up to 30 MB are accepted, in JPG, PNG, WebP, AVIF and iPhone HEIC.

Is KB bigger than MB?

No. A megabyte is a thousand kilobytes, so a file measured in MB is the big one. A form that asks for KB is asking for something much smaller. Going from MB to KB means removing most of the bytes. A 1 MB photo has to lose nine tenths of them to fit a 100 KB rule. Compression to a cap does exactly that, in one pass.

Which image size is required for government forms?

Tens to hundreds of kilobytes, stated as a window. India's GST registration guide wants the promoter's photograph as a JPEG of at most 100 KB. The proofs on the same form may run to 1 MB. Exam portals state a window with a floor as well as a ceiling. Read your own form's number, type it as the cap, and keep JPEG as the output.

What is the maximum file size I can compress?

30 MB per image and 50 JPGs per batch. PNG, WebP, AVIF and iPhone HEIC work too, 10 per batch, since each becomes a JPEG. That covers a camera export or a full-resolution phone photo with room to spare. The free allowance is 300 images a day, counted live beside the tool, with no account and no watermark on anything you download.

Can I convert an image to a specific KB size?

Yes. Type the kilobyte figure into the Max file size field, or tap a chip. The output lands at or under that number, never over. The engine binary-searches quality for the most detail that fits, and shrinks the dimensions only when no quality setting can. The exact size prints beside each result, so you can read the KB figure before you upload.

How do I convert a 1 MB photo to 100 KB?

Tap the 100 KB chip and drop the photo. A tenfold shrink is well inside what the quality search does on its own. Our 9.8 MB camera photo, 98 times the cap, still came back at 97.3 KB with every pixel. A 1 MB file has far less to lose. Check the printed size, then upload the JPEG.

Why is my photo in MB when the form wants KB?

Because the camera saved it for printing, and the form only needs it for viewing. A phone stores every pixel its sensor has at a high quality setting, which lands in megabytes every time. The form wants a face or a document that reads on a screen, a job a few hundred kilobytes does. The gap between the two is what a cap removes.

How do I change MB to KB without losing quality?

You lose some, and the engine makes it the least the number allows. It searches for the highest quality that still fits under your cap and keeps the dimensions whenever it can. Our 9.8 MB camera photo came back at 194.8 KB under 200 KB and 497.7 KB under 500 KB, both at its full 4964×2782. The compare slider on the result shows the trade.

Is a PNG photo harder to get from MB to KB than a JPG?

As a PNG, yes; as a JPEG or WebP, no. PNG has no quality setting to spend, only a palette to trim, so a photo stays large as PNG. Our reference photo saved as PNG, 4.1 MB, came out at 994.3 KB as PNG at Auto, 273.9 KB as JPEG and 218.9 KB as WebP. Leave the output on JPEG, or pick WebP, and the cap does the rest.

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Megabytes in, kilobytes out

The size field is open above. Type the KB figure the form wants, drop the photo, and read the result off the row.

Compress to KB