How to use the signature resize tool

Choose Signature Resizer or Photo Resizer, then upload a JPG, PNG or WebP image from your phone or computer.
For a signature, tick the clean-up options you need: trim the empty paper, remove shadows, darken the ink. Before and after appear side by side.
Under Output size, pick the KB range your form gives, or switch to By pixels or cm and enter the exact size from your form.
Press Resize to JPG. Before the download button appears, the file is reopened and checked: pixels, file size, format and DPI, each marked pass or fail against your target.

Your image is processed on your device and never uploaded. Once this page has loaded, the tool works even offline.

KB, pixels and DPI: what the form is asking for

KB (file size): How much space the file takes. Upload pages check it first, and many give both a minimum and a maximum. The tool changes JPG quality to land inside the range; it never adds hidden padding.
Pixels (image size): The width and height of the picture, such as 709 × 236 px. Use exact pixels when the form gives them.
cm and DPI: A size in cm becomes pixels through DPI (dots per inch). At 300 DPI, 6 × 2 cm is 709 × 236 px. The 3.5 × 4.5 cm photo size table lists the pixels for each common DPI.

For signatures with a 10 KB minimum and a 20 KB maximum, the 10–20 KB signature guide explains both limits and what to do when a file will not fit. To print a name and date under a photo, use the name and date on photo tool.

Checked exam sizes

Exam and file	Size	File size	Source, checked on
SSC signature, 6 × 2 cm, 10–20 KB	6 × 2 cm (709 × 236 px at 300 DPI)	10–20 KB	SSC CGL 2026 notice, para 9.6, 2026-11-08

How we check exam sizes

Sizes for the same exam differ from site to site, and many are copied from old notices. We add an exam only after reading its current official notice, and we show the notice and the date we checked it. Exams we have not checked are not listed; for those, enter the size printed in your own notice.

Checked so far: SSC, from the CGL 2026 notice. The SSC signature resize page explains its 6 × 2 cm and 10–20 KB rule.

Why an upload page rejects a photo or signature

Most rejections come from a handful of checks that the upload page runs before anyone looks at the image:

File too big or too small. The KB limits are checked first. A file a few bytes over the maximum fails just like one that is far over, so the tool keeps a safety margin on both sides.
Wrong pixel size. Some pages accept only the exact width and height they list. Others accept a range. Enter the size printed in your notice under By pixels or cm.
Wrong format. Most forms want JPG or JPEG. A PNG renamed to .jpg is still a PNG inside and can fail; the tool always writes a real JPG.
Unreadable content. A dark background, a shadow across the face, or a signature too faint to read can be refused later, even after the upload succeeds. The clean-up options for signatures help with the last two.

The check list under each result covers the first three. For the last one, compare your file with the sample in your notice before you submit.

Getting a clean signature scan

Sign on plain white paper with a black or dark blue pen. Ruled paper leaves lines in the scan.
Photograph it in daylight, straight from above. If a shadow still shows, tick Remove shadows and uneven light.
Leave a little space around the signature; Trim empty space crops it neatly and the tool adds an even white margin.

Questions

What size should my signature be?

Use the size printed in your form's notice or upload page. Forms usually give a KB limit, often with both a minimum and a maximum, and sometimes a pixel or cm size. Enter both here. If the form gives only a KB limit, the default 400 × 133 px at 200 DPI is a reasonable starting size.

Is my signature uploaded anywhere?

No. The signature resize happens in your browser with your device's own processor. Once the page has loaded you can even switch off your internet connection and the tool keeps working. Closing the tab discards the image.

The form says my file is too small. What now?

Some forms set a minimum, such as 10 KB. Enter it in Minimum KB. If a very plain scan still cannot reach the minimum, the tool tells you instead of padding the file. Scan the signature again with darker ink, or choose a larger pixel size.

Why does my computer show a slightly different KB?

Some systems count 1 KB as 1000 bytes and others as 1024 bytes. The tool shows the exact byte count and keeps the file inside your range under both readings, so the upload page accepts it either way.

Can I resize my photo and signature together?

Do them one after the other. Resize the signature first, download it, then switch to the Photo Resizer tab. Each tab keeps its own size and KB settings.

What is 6 × 2 cm in pixels?

At 300 DPI, 6 × 2 cm is 709 × 236 px; at 200 DPI it is 472 × 157 px. This is only a unit conversion: use it when your form gives the signature size in cm. If the form lists pixels, use those pixels exactly.

Does it work on a phone, and without internet?

Yes to both. The tool runs in any current mobile browser, so you can photograph a signature and resize it on the same phone. Once the page has loaded, it keeps working with mobile data or Wi-Fi switched off, because nothing is sent to a server.

Which file type does the tool produce?

A JPG (JPEG) file, which almost every application form accepts. You can start from a JPG, PNG or WebP image. Transparent PNG signatures are placed on a white background.

Resize Signature & Photo in KB / Pixels

Output size