Compress Image to 10KB

Shrink any image to under 10KB for digital signatures, exam form uploads, and portals with ultra-strict size limits. Free, instant, and 100% private.

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Pre-configured: Tiny preset + JPEG + 400px for ultra-small files

Compress Image to 10KB — Free, Fast & Private

Many government exam portals and recruitment forms require digital signature files under 10-20KB. Indian exam portals like UPSC, SSC, RRB, IBPS, state PSC, and NEET specify strict signature size limits — often between 4KB and 20KB in JPEG format with specific pixel dimensions (typically 140×60 or 150×70 pixels). Meeting these exact requirements with a standard phone camera photo or scanner output is nearly impossible without a compression tool.

MiniPx makes hitting the 10KB target straightforward. The recommended settings for signatures are: JPEG output format, Tiny compression preset, and 400px max width. For most signature images, this combination produces files between 3-10KB — well within even the strictest portal limits. If your signature scan is a full A4 page, crop it to just the signature area before uploading to MiniPx for the best results.

Unlike other compression tools, MiniPx processes your signature image entirely in your browser. Your signature — which is a legally sensitive document — never gets uploaded to any server. This matters because a digital signature could be misused if it falls into the wrong hands. With MiniPx, your signature stays on your device from start to finish.

Signature size requirements for Indian exam portals

Each exam portal has slightly different requirements. UPSC CSE and IFoS applications require signatures between 4KB and 30KB in JPEG format. SSC CGL and CHSL specify 10-20KB with dimensions of 140×60 pixels. IBPS PO and Clerk exams accept signatures between 10-20KB at 140×60 pixels. RRB NTPC and Group D have similar 10-20KB limits. State PSC exams vary but most accept 10-30KB in JPEG format.

The safest approach is to target 8-10KB — small enough for any portal, large enough to remain legible. After compressing in MiniPx, the tool displays the exact file size next to your image. If you need specific pixel dimensions, use the image resizer first to set exact width and height, then compress to the target file size.

Tips for compressing signatures to under 10KB

Start with a clean signature scan or photo. Use a white background with dark ink for maximum contrast. Crop the image tightly around the signature — extra whitespace adds file size without adding value. In MiniPx, set the output to JPEG format (not PNG — PNG files are much larger for this type of image), use the Tiny preset, and set max width to 300-400 pixels. The result will be a sharp, compact signature file that meets any portal requirement.

If you also need to compress a passport photo alongside your signature, use the 50KB compressor or 100KB compressor for the photo — those tools are pre-configured for photograph compression rather than signature compression.

How it works

Scan or photograph your signature: Use a white sheet of paper and dark ink. Photograph with your phone camera or scan. Crop tightly around the signature — remove excess whitespace.
Upload to MiniPx: Open the 10KB compressor above. Add your signature image. MiniPx accepts JPEG, PNG, and WebP input files of any size.
Set Tiny preset + JPEG + 400px: These settings are pre-configured when you use the link above. Tiny preset maximises compression, JPEG produces the smallest files, and 400px width is sufficient for form uploads.
Verify the compressed size: MiniPx shows the exact file size after compression. Confirm it is under 10KB (or whatever your portal requires). If too large, reduce width to 300px.
Download and upload to your form: Save the compressed signature and upload it to the exam portal or government form. The file is ready to use.

Frequently asked questions

How do I compress a signature to under 10KB?

Use MiniPx with JPEG format, Tiny preset, and 400px max width. This produces signature files between 3-10KB. If still too large, reduce width to 300px or crop the image more tightly around the signature.

What is the signature size for UPSC application?

UPSC requires signatures between 4KB and 30KB in JPEG format. The recommended dimensions are typically 140x60 pixels. Use MiniPx with Tiny preset and 400px width, then verify the output is within the specified range.

What is the signature size for SSC exam?

SSC CGL, CHSL, and other SSC exams require digital signatures between 10-20KB in JPEG format with dimensions of approximately 140x60 pixels. MiniPx with Tiny preset easily produces files in this range.

Can I compress a signature on my phone?

Yes. Open minipx.com in your phone browser, photograph your signature, upload it, and compress. No app needed. Works on iPhone and Android.

PNG or JPEG for signature upload?

Always use JPEG for exam and government form signatures. JPEG files are 3-5 times smaller than PNG for the same image. Most portals specifically require JPEG format. MiniPx converts PNG signatures to JPEG automatically when you select JPEG as the output format.

Is it safe to compress my signature online?

With MiniPx, yes. Your signature image never leaves your browser — it is processed entirely on your device using JavaScript. Unlike cloud-based tools, MiniPx does not upload your files to any server. This is critical for legally sensitive documents like signatures.

How do I make my signature file smaller without losing clarity?

Crop tightly, use high-contrast ink on white paper, and compress with MiniPx Tiny preset at 300-400px width. Signatures with dark ink on white backgrounds compress extremely well because they have simple colour data. A clean signature typically compresses to 5-8KB while remaining perfectly legible.

What dimensions should a digital signature be?

Most Indian exam portals require 140x60 pixels for signatures. Some accept up to 150x70 pixels. Use MiniPx to compress to the target file size, then check if the portal specifies exact dimensions. If so, use the MiniPx resize tool to set precise pixel dimensions before compressing.