ShortPixel Alternative for Mac: When Local Beats the Cloud

In most web publishing setups. Specifically:

You run WordPress. This is the case ShortPixel was built for and Smol was not. The plugin works on the thumbnail sizes your theme generates, creates WebP and AVIF versions, and handles bulk optimization of a media library. A desktop app cannot do any of that, because it is not in the upload path.

Other people upload the images. Editors, clients, customers. If a file reaches your site without passing through your Mac, the optimization has to happen on the server or at a CDN, and ShortPixel offers Drupal, PHP, Node.js and .NET tooling as well as WordPress.

You only compress a few images. The free plan gives 100 credits a month, which may be all you need. Check its pricing page for paid plans before assuming $29 is the cheaper route.

You need pixel-identical output or background removal. ShortPixel’s Lossless mode is documented as identical to the original pixel for pixel, and background removal is built into its Mac app. Smol offers neither.

In credits. The free plan gives 100 credits a month, and paid options are listed on shortpixel.com/pricing, which shows a free plan, monthly and yearly Unlimited subscriptions, and one-time credit packages. We do not quote its prices here because the page did not show them when we checked on 14 October 2026; read the current figures there.

What a credit buys is the part to read carefully. ShortPixel’s knowledge base says a credit is charged when it optimizes an image or thumbnail by at least 5%, that each thumbnail is billed separately, and that WebP or AVIF versions cost one additional credit per file. Its own example: one original, eight thumbnails and WebP versions of all nine files comes to 18 credits.

So on WordPress the unit is not “a photo.” Those thumbnails are real files your visitors download, which is why a subscription can make sense for a busy site. For a local folder of images the arithmetic is simpler, and ShortPixel’s free tier may cover a light user entirely. The reasons to pay $29 for Smol instead are the ones below.

Yes. ShortPixel launched a native Mac app on 17 April 2026, with Lossy, Glossy and Lossless modes, WebP and AVIF output, resizing, CMYK conversion, background removal and upscaling. On first launch it asks for your API key, and the free plan’s 100 credits a month apply there.

ShortPixel’s products page describes its Post Reducer API as optimizing an image by “uploading it to our servers via a POST HTTP call.” The Mac app announcement does not spell out how the app talks to the service, but it runs on your API key and credits, so we would plan on the files travelling to ShortPixel.

The announcement’s line “No uploads to a web tool” is accurate in the sense it intends: you never open a browser. Its FAQ says optimized images are kept on its servers for two hours so you can download them, then deleted. That is a reasonable policy. For a client’s unreleased product shots or anything under NDA, reasonable may still not be enough, and that is the case for a tool that never sends the file anywhere.

Three things, and one of them is not compression quality.

Nothing leaves the Mac. Smol processes every file on your machine, needs no account, and works on a plane. It strips metadata by default, which matters when the images carry GPS positions; our guide to removing EXIF data on a Mac explains what is in there.

The job is bigger than images. Smol compresses PDFs with five presets, video to H.265, and audio at 16 to 512 kbps, and converts table and font files. ShortPixel’s FAQ lists JPEG, PNG, GIF and PDF files.

The workflow is the Mac’s. Watched folders, a Finder Quick Action, and clipboard compression for screenshots. Both products now speak MCP: ShortPixel hosts a server at mcp.shortpixel.com that optimizes public image URLs through its API with your key, while Smol’s MCP server runs on your Mac, so an agent like Claude Code can compress a folder without the files leaving it.

What we have not done is claim Smol compresses better. A fair test would pin both tools to the same output quality, and ShortPixel exposes three modes rather than a quality number, so there is no setting we could match to Smol’s 0 to 100 scale. Anyone who quotes a fixed percentage between the two has chosen the settings. For what actually moves page speed, format and pixel width matter more than the encoder, as our measured Core Web Vitals guide shows.

Stop at the first row that describes you.

Many sites should use both: ShortPixel on the server for everything uploaded, and a local tool for the assets you prepare yourself before they go anywhere, which is the split we describe in image optimization for web developers. Smol is a one-time $29 purchase for one Mac. For other comparisons in the same space, see Smol vs TinyPNG and our CloudConvert alternatives, another credit-metered cloud service.