Free image resizer and size converter

No. Decoding, drawing and encoding all go through the browser canvas and the page has no file endpoint — check the Network panel: apart from the page’s own static assets, nothing carries your image. The trade-off is that a refresh clears it: images and results live only in this tab, so closing, refreshing or opening a new tab loses them. Download first.

The source is too small. Each size is redrawn at its target pixels, so anything smaller is interpolated up. The hungriest is YouTube channel banner（2560×1440）; the cheapest is X (Twitter) avatar（400×400） — the more sizes you check, the more likely one or two are upscaled. The source bar tells you the numbers.

Cover-crop always cuts edges — that is the definition, not a bug. Switch to contain to see the whole frame, or lock the target ratio in the crop dialog and frame what matters. Platforms crop again on top: avatars become circles, channel banners keep only a middle strip on phones. Open the preview and switch to platform view to see both the crop and the interface overlay.

Check three things. Format: transparency exists only in PNG, so switching back to JPEG silently disables it. Fit mode: with contain and no transparency the margins are filled with the background colour. Source: an opaque source produces a PNG with no transparent pixels — nothing can invent them.

PNG is lossless, JPEG is lossy — several times the size for the same image is normal. Without a transparency requirement use JPEG: photos, screenshots and gradients all suit it better. Pay the PNG cost only when you need cut-out transparency, or large flat colour with type.

What you export is a square canvas; the circle is applied by the platform after upload. Keep key artwork away from the corners, inside the central safe area — platform preview shows the ring that gets cut. Making the corners transparent does not help either: most avatar slots fill alpha with white or black.

On purpose: arriving with ?size= narrows the export set to that one size so you do not have to generate all 11 first. To get everything, open “Export sizes → Select all” in the toolbar; the matching card also highlights for a few seconds.

Only the results currently on screen, with exactly the same filenames as individual downloads — no source image and no readme. The archive is named like social-sizes-20261024-1208.zip with a local timestamp, which makes batch archiving easy.

Correct. The home page only does “pick a file, open the workbench”; the file is handed over in the same tab’s memory and never written to storage. That path therefore has to be an in-site navigation — a new tab or a refresh loses the image, by design. Pick it again, or drop it straight into the converter.

No, but it will not get sharper either. Sources above 4096px on the long edge are scaled down to 4096 first, purely to bound memory; the largest output only needs 2560px of width, so there is headroom. You would only notice the downsample if you cropped a tiny region and exported it large.