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Compress Image to 10 KB

Reduce a photo, scan or signature to 10 KB or less, ready for signatures and forms with a 10 KB limit. The tool keeps the highest quality that fits and shows the exact file size before you download.

Compress by
Maximum file size

Keeps the highest quality that fits; shrinks the image only if it has to.

Smaller dimensions are the biggest saving for large photos.

Getting a photo under 10 KB

Online forms often set a strict size limit for photos and signatures. Choose your image above and it is compressed to 10 KB or less automatically. The tool starts at the highest quality and lowers it step by step until the file fits; if the photo is very large, it is also reduced in pixel size, which keeps it clearer than squeezing a huge image into a tiny file.

  • Check other requirements too. Many forms also ask for specific dimensions (for example 200 × 230 pixels) or a format. Use the converter to change the format, and the Resize option here to set the size.
  • Crop first. A tight crop of the face or signature keeps more detail within the same file size.
  • Scan signatures in good light on white paper: a clean background compresses far smaller than a grey, shadowed one.

Where 10 KB is asked for

Requirements as published for the 2026 cycle. They change between years and exams, so check the instructions for your own form before you upload.

FormWhat it asks for
Forms that cap signatures at 10 KBUsually 140 × 60 px or similar, JPG

SSC and IBPS signatures must be at least 10 KB and at most 20 KB. For those, compress to 20 KB instead: a file under 10 KB is rejected.

Step-by-step help with pixel sizes, formats and rejections: how to reduce photo and signature size for online forms.

Which level to choose

LevelJPG and WebPPNGGood for
SmallestQuality 6064 coloursThumbnails, previews, chat
BalancedQuality 75256 coloursWebsites, email, social media (default)
Best qualityQuality 85LosslessPortfolios, print proofs, archives

Use Compare on any image to drag between the original and the compressed version before you download.

Getting the smallest files

  • Resize large photos. A 12-megapixel phone photo is about 4000 pixels wide; a website rarely shows images wider than 1920. Setting a maximum size is often the single biggest saving.
  • Use the right format. Photos belong in JPG or WebP; screenshots, logos and graphics with flat colours in PNG. WebP is typically 25–35% smaller than JPG and works in all current browsers.
  • Compress from the original. Each round of lossy compression loses a little more detail.

Private by design

Compression runs in your browser using WebAssembly versions of MozJPEG, libwebp and OxiPNG, the codecs behind Google’s Squoosh (licences). Your images are never uploaded. Compressed files are saved without EXIF metadata, so camera details and GPS location are not shared.

Common mistakes

  • Saving photos as PNG

    A photo saved as PNG is often five to ten times the size of a good JPG with no visible benefit. Choose JPG or WebP under "Save as".

  • Compressing a screenshot as JPG

    Text and sharp edges in screenshots blur and ring as JPG. Keep screenshots as PNG; the palette compression here shrinks them just as much.

  • Squeezing a huge photo into a tiny file

    A 4000-pixel photo at 50 KB looks blocky. Reduce the pixel size first (the File size mode does this for you) and the result stays clear.

Guides

Frequently asked questions

How do I make sure the image is under 10 KB?

Choose your image and it is compressed straight to 10 KB or less: the tool tries the highest quality first and only lowers quality, then size, until the file fits. The new size is shown before you download.

Is 1 KB 1,000 or 1,024 bytes here?

1,024 bytes, the way Windows, macOS Finder in most views, and most online forms count. A 10 KB result is at most 10,240 bytes, so it passes forms that use either definition.

Will the image still look sharp?

The tool keeps the highest quality that fits 10 KB. At very small sizes a large photo is also reduced in pixel size, which keeps it clear instead of blocky. For passport-style photos and signatures this is normally what forms expect anyway.

Can it change the format too?

Yes. Forms usually ask for JPG, which is the default for photos. Choose JPG under "Save as" if your image is a PNG or WebP and the form needs JPG.

Are my photos uploaded?

No. Compression runs entirely in your browser, so documents such as ID photos and signatures never leave your device.

Last reviewed 9 October 2026. This tool runs in your browser; nothing you enter is stored or sent to Boostlix.