Resize Image in Pixels

How we tested: what a pixel size does to the file size

Each row is one run of this tool's own size search, set to fill frame, on a computer-generated test picture with no person in it: 1200 × 900 px and 278.4 KB (285,062 bytes). The first measured column leaves the maximum at the page's opening value, 10,240 KB, so the JPG is saved at the top quality, 100 out of 100. The last two columns set a 50 KB maximum, the IBPS photograph limit, and show what the tool had to give up to reach it.

Tested on 14 October 2026 by running this tool's own code in Google Chrome 155.0.8059.40. Another browser's encoder gives different byte counts, so treat the table as an example and read the size the tool reports for your own picture. Sizes are counted as 1,024 bytes to the KB; every file in the 50 KB column is also under 50,000 bytes. "Source scaled by" is output width divided by the width of the part of the picture that was used; above 1 means pixels were added.

From 200 × 230 to 630 × 810 the pixel count rises 11.1 times and the file at top quality 7.8 times. When a form fixes the pixels, the JPG quality is the only thing left to give: reaching 50 KB at 630 × 810 took the quality down to 68, and at 1200 × 1380 to 26. If your form states a KB range as well, type it in the tool; the photo resizer in KB covers KB windows in more detail.

Pixel sizes that exam forms and portals state

Each row was read in the issuing body's own document on 14 October 2026. The fourth column copies the sentence that gives the pixels, so you can see whether the body calls the size preferred, a minimum or simply the size. IBPS, RCF and India Exim Bank call their pixel sizes preferred and give the file size as the limit that is enforced. Type the pixels in the tool, and the KB range beside them.

The TNPSC site did not respond on 14 October 2026, so its wording was read in an archived copy of the Instructions to Applicants taken on 2 January 2026. Quotes keep the documents' own spelling and spacing.

Left out because the source gives no pixels, as read between 24 September and 11 October 2026: SSC CHSL and CPO 2026 give the signature in centimetres only (about 6.0 × 2.0 cm). UPSC and NEET (UG) 2026 state a file size for the photograph and no pixels. The US passport pages and the Indian e-Visa portal state no pixel count for the photograph. Those rules, the file-size ranges and what each source leaves open are in the table on the photo resizer in KB. TNPSC and IBPS also have pages of their own: TNPSC photo and signature and IBPS RRB Officers.

Fill frame or fit all at the same pixel size

The test picture is 1200 × 900 px and the IBPS photograph frame is 200 × 230 px, so their shapes differ and the tool has to choose between two things. Fill frame scales the picture until it covers the frame and trims what overflows. Fit all scales it until all of it is inside and fills the rest with white.

Arithmetic: the frame is 200 ÷ 230 = 0.870 as wide as it is tall and the picture is 1200 ÷ 900 = 1.333, so fill frame keeps a column 900 × 200 ÷ 230 = 783 px wide. Fit all scales by 200 ÷ 1200 = 0.167, which makes the picture 900 × 0.167 = 150 px tall. Measured on 14 October 2026, same method as above, 50 KB maximum.

Use fill frame for a portrait where the part that gets trimmed is background. The IBPS photograph preset uses it. Use fit all for a signature, thumb impression or handwritten declaration, where trimming would cut off ink; the IBPS presets for those three use fit all. If you want a different part of the picture inside the frame, crop it yourself first, then resize.

Making a picture bigger adds pixels, not detail

If your picture has fewer pixels than the size a form asks for, the tool still reaches the size you type, filling the extra pixels in from their neighbours. To see what that is worth, each row below shrinks the 1200 × 900 test picture, enlarges it back to the same size and compares it with the original, pixel by pixel. The last column is the mean difference per colour channel, out of 255.

Measured on 14 October 2026 in Google Chrome 155.0.8059.40 with plain canvas scaling; both copies saved at JPG quality 92. One test picture, so the figures show the direction, not a rule for every photograph.

The enlarged files are far bigger than the small copies they came from, yet the further a picture was shrunk, the further its enlarged version is from the original. A larger file is not a sharper one. When a form wants more pixels than you have, take or scan the picture again at a higher setting.

Keep the shape: work out the other side from the ratio

A resized picture keeps its shape when width ÷ height stays the same. If you know one new side, the other is new height = new width × original height ÷ original width. For a 1200 × 900 picture resized to 800 px wide that is 800 × 900 ÷ 1200 = 600. A form that states both sides at a different shape cannot be met without cropping or white bars, which is the choice in the section above.

Ratios of the sizes above

Each ratio is the width and height divided by their largest common factor: 230 × 75 divided by 5 is 46:15. For a size in centimetres, the pixels, KB and DPI guide shows the conversion.