Medium app icons at 256×256
Installers, store listings, and intermediate touch-icon sets often cite 256×256. It is large enough for a readable mark yet still unforgiving of noisy backgrounds. Produce a true 256×256 download, then keep a larger master offline if you still need 512 or 1024 variants later.
Source masters that survive downscaling to 256×256
Start from a larger master when possible; upscaling a tiny source makes edges fuzzy even if pixels match. Prefer a clean master with more pixels than you need when downscaling; upscaling tiny sources cannot invent detail. Do not upload documents your organization forbids processing online; prefer offline tools when policy requires it. If the published rule shifts, switch to the sibling tool that matches the new number. Width and height on the result card update whenever the engine changes dimensions.
Two-fifty-six-pixel icons for desktop and mobile shells
Operating-system icon slots and dense app grids often standardize on 256×256 masters before downscaling further. Pixel boxes and kilobyte caps are independent validators, satisfying one never excuses the other. If rejection continues, re-read the help text for a second hidden rule. If the result looks too soft, tighten framing before lowering quality again.
Sharp edges versus JPEG at 256×256
Gradients band if quality is too low, start from vector or high-res raster when logos must stay crisp. Desktop property panels may round differently than portal checks, trust the on-page measured bytes. Avoid stacked extensions like .jpg.jpg; intake scripts often choke on them. Portals care about clearing the limit more than hitting a precise byte total.
PNG alpha versus JPEG at two-fifty-six pixels
Default JPEG output keeps bytes practical for photo content. Transparency belongs on PNG siblings; flatten intentionally when the checklist demands JPG. Match the published width×height first when both rules appear, then return for weight targeting if needed. Start from the original export whenever you still have it, not a chat-compressed copy. When format or pixel rules sit outside this page, finish those steps on the related tools linked nearby.
Secondary byte caps after 256×256 resize
Enterprise portals may reject multi-hundred-kilobyte icons even when pixels match, chain compress tools when weight lines appear. Very large source dimensions fight small byte budgets; the engine may reduce width and height when quality alone fails. Related pages handle neighboring ceilings so you are not stuck forcing one target. When format or pixel rules sit outside this page, finish those steps on the related tools linked nearby.
Batch icon sets at two-fifty-six pixels
Light and dark theme variants preview independently at the same square target. Very large source dimensions fight small byte budgets; the engine may reduce width and height when quality alone fails. Nearby tools cover adjacent size and format rules when this page is not the match. Width and height on the result card update whenever the engine changes dimensions.
Pre-release icon QA at 256×256
Inspect download at 100% zoom on the device shell that will display the icon, not only in a stretched browser preview. Plain backgrounds and tight framing usually beat aggressive quality drops alone. Rename the download to a plain label plus one extension before submission. Width and height on the result card update whenever the engine changes dimensions.
How the resize is applied
Output is written at 256×256 pixels. The preview and download use that raster. File weight still depends on subject detail and the output format, not only the pixel box.
Resize checks
Exact-size tools are checked by measuring the output width and height after processing. A pass means those pixels match the named box. File size is reported separately. Reviewed 5 October 2026.
Technical reference
Everyday “JPEG” files follow the JFIF interchange pattern on top of JPEG compression. MDN summarizes the type, MIME value image/jpeg, and common extensions: MDN image file type guide.
Frequently asked questions
256×256 for OS icon slots?
Common when checklists cite two-fifty-six-pixel squares, read final dimensions on output. Batch mode still shows per-file previews. Review each result before submitting a set.
256×256 enough for byte limits?
Enterprise uploads may cap weight after pixels pass, open compress siblings when needed. Batch mode still shows per-file previews. Review each result before submitting a set.
Upscale to 256×256 for icons?
Soft edges are likely, export from vector or high-res raster when crispness matters. If softness is unacceptable, crop tighter or ask whether a higher official limit exists.
Orientation after 256×256 export?
Use preview on the target device; EXIF may not reflect launcher display. Neighboring tools exist for nearby sizes; switching is better than forcing the wrong ceiling.
Batch icon masters at 256×256?
Each file previews separately before platform-specific downscales. Neighboring tools exist for nearby sizes; switching is better than forcing the wrong ceiling. Open the download once on your submission device before retrying the portal.
Dedicated 256×256 page rationale?
Generic resize works broadly, this page names the exact box so search intent matches the checklist. Neighboring tools exist for nearby sizes; switching is better than forcing the wrong ceiling.