How to Compress Image to 10 KB (Photo, Signature, Passport)

To compress an image to 10 KB, crop it to just the part you need, resize it to small dimensions (a passport photo around 200 x 230 pixels, a signature around 140 x 60), and then save it as a JPG at a quality that fits under 10 KB. Our compress image to 10 KB tool does the last two steps for you in the browser, on a phone or a PC, and nothing is uploaded.

10 KB is one of the tightest limits you will meet on an online form. A normal phone photo is 2–5 MB, which is two or three hundred times bigger. You can get there, but only if you stop the tool from having to throw away detail it actually needs.

How to reduce image size to 10 KB, step by step

1. Start with a clean picture. Good daylight, plain light background, no shadow behind the head. For signatures, black ink on white paper.
2. Crop first. Use crop image to cut away everything except the face and shoulders, or everything except the signature. Every pixel of empty wall you keep is data the compressor has to pay for.
3. Check the pixel size the form wants. If the notice gives dimensions, resize to them. The exam photo resizer has presets for common forms and a Custom option where you type your own width, height and KB range.
4. Compress to the target. Open compress image to 10 KB and choose your file. It searches for the highest JPG quality that keeps the file under 10 KB. If that quality would be too low to look decent, it scales the picture down a little instead and tells you the new size.
5. Zoom in and check. Make sure the face or signature is still clear and the file name ends in .jpg.

Why cropping matters so much at 10 KB

The compressor has a fixed budget: about 10,000 bytes. If the image is 3000 x 4000 pixels, that budget is spread across 12 million pixels and each one gets almost nothing, so you see blocks and smudges. If you crop and resize to 200 x 230 pixels, the same budget covers 46,000 pixels, and a JPG at that size often lands around 10–20 KB at normal quality, so only light extra compression is needed.

So the real trick to compressing photos below 10 KB is to make the photo small in pixels first. That is also why the tool will sometimes shrink the dimensions on its own: it prefers a slightly smaller image at decent quality over a full-size image that looks like it was left in the rain.

Passport size photo to 10 KB

Most passport-style photos for Indian forms are portrait, roughly 3.5 x 4.5 cm. In pixels that might be 200 x 230 (bank exams), 213 x 213 (online PAN applications) or larger. Here is how a 10 KB limit plays out:

These are typical uses, not rules. Always follow the sizes in your own notice, because they change between exams and years.

If your form wants a 3.5 x 4.5 cm photo but also says under 10 KB, resize it at 200 DPI rather than 300 DPI. The resize image in cm tool lets you pick the DPI, and fewer pixels make the 10 KB target much easier. Our guide on image size, resolution and DPI explains the maths.

Compress image to 10 KB to 20 KB (when there is a minimum)

Many forms do not say "under 10 KB". They say "between 10 KB and 20 KB", and a file of 7 KB is rejected just like one of 25 KB. The plain compress tool only guarantees the maximum. For a range, use the exam photo resizer:

1. Choose Custom in the form list (or the preset for your exam if it is there).
2. Type the width and height in pixels, then set Min size to 10 and Max size to 20.
3. Choose your photo or signature.

The result is a JPG inside the range. If the compressed picture comes out smaller than the minimum, the tool adds harmless padding data to the file so it reaches the minimum without changing a single pixel. The note under the result tells you whether it is within the range.

Aim for the middle, about 15 KB, rather than exactly 10.0 or 20.0. Some portals count 1 KB as 1000 bytes and others as 1024, so a file right on the line can fail.

Signatures at 10 KB

Signatures are the easiest thing to get under 10 KB, because they are mostly white paper. To keep them sharp:

• Sign with a dark pen, not pencil, on plain white paper.
• Photograph it from straight above in good light, without your phone's shadow on the page.
• Crop tightly, leaving only a small margin around the ink.
• Turn on Black & white in the exam photo resizer. It removes the grey cast of paper and makes the file smaller too.

For more on this, see how to make your signature clear for online forms.

On a phone or on a PC

You do not need an app. On Android or iPhone, open the tool page in Chrome or Safari, tap to choose the photo, and download the result. On Android it goes to Downloads; on iPhone, Safari saves it to the Files app. When the portal asks you to upload, pick the file from there so you do not accidentally choose the original from your gallery.

If your iPhone photo is HEIC, the tool reads it and saves a JPG, which is what almost every portal wants.

On a laptop, drag the file onto the page. The compression happens inside your browser, so it works even on a slow connection.

Common mistakes

• Compressing the full phone photo. Crop and resize first. It is the difference between a clear face and a smudge.
• Uploading the original by mistake. The compressed file ends in -compressed.jpg. Rename it to something short like photo.jpg if the portal dislikes long names.
• Going below a minimum. If the notice gives a range, use the exam photo resizer, not the plain compressor.
• Wrong format. PNG and HEIC files are often refused. The 10 KB tool saves JPG for photos taken on phones and cameras.
• A busy background. Patterned walls and dark rooms eat bytes and get photos rejected. A plain wall helps both problems.

If your limit turns out to be a bit more generous, the 20 KB and 50 KB targets keep more detail. Our guide to reducing photo size to 20 KB or 50 KB covers those.

Questions