Image Optimizer: compress, cut out, and upscale without leaving this computer
Image Optimizer is a local batch output tool for macOS and Windows. Drop in a folder, pick a plan, and compress, convert to WebP / AVIF / JPEG XL, remove backgrounds, enlarge 2× or 4×, watermark, or shrink PDFs. Work happens on your machine. Images and PDFs are not uploaded. On Windows you can also install from the Microsoft Store .
Free quota is 300 images per calendar month. Failed jobs do not count. Pro is unlimited after a one-time CD-Key, on up to 3 devices. Watermark, watch folders, upscale, and cutout are available to free users. The gate is quota, not feature locks.
Download · Microsoft Store · Getting started · FAQ
What it is and is not
| A fit | Not a fit |
|---|---|
| Whole folders to compress, convert, or export sizes without sending assets to a website | One tiny file where an online tool is faster and you accept uploads |
| Product shots that need a white background, several sizes, and a watermark, and must stay offline | 80+ filters, node graphs, RAW, or PSD |
| Sites or installers that need WebP / AVIF / JXL and a visual check | Cloud-credit cutout, image generation, or a monthly retouching suite |
| A PDF in the same queue, with text still selectable when possible | Saving pictures as PDF, or opening encrypted PDFs |
Lab samples (labeled, not a global average): a 6-file mixed jpg/png/gif/webp set went from 3.19MB to 0.95MB, about −70.3% (RC on 2026-08-22). A photo-heavy PDF went from about 11.5 MB to 1.49 MB on the ebook preset.
Main capabilities
| Capability | Notes |
|---|---|
| Batch | Drag-and-drop, multi-file, recursive folders; one bad file does not stop the rest |
| Nine outputs | WebP, AVIF, JPEG, PNG, GIF, TIFF, HEIF, JPEG 2000, JPEG XL, or keep the original |
| Extra inputs | HEIC, SVG, BMP, PDF |
| Six built-in plans | Compress, WebP, target size, multiple sizes, upscale, cutout |
| Compare | Split or side-by-side after processing |
| Watermark | Nine-cell placement, margin, scale, opacity |
| Watch folders | New images or PDFs in a folder run with the selected plan |
| Negative-opt guard | If the file grows, original bytes are kept (not after a successful upscale or cutout) |
| Target file size | Approach a byte budget by quality and resolution |
| Local upscale | 2× / 4× in the plan; install the engine in Settings |
| Local cutout | Remove the background in the plan; install the engine in Settings |
| PDF compression | Preset quality, output stays PDF, text stays selectable when possible |
See web assets, product photos, formats, PDF, upscale and cutout, and watch folders.
Free vs Pro
There is no feature wall. Free and Pro share the same tools. The difference is count:
- Free: 300 images per calendar month. Failures do not count. The counter resets next month.
- Pro: lifetime unlock on the site (￥79.99 on the Chinese page, $14.99 on the English page) via CD-Key, on up to 3 devices.
When quota runs out, an upgrade dialog appears. Jobs do not fail silently. See Getting started and pricing .
How is this different from online compressors?
Online compressors often cap size (for example 5 MB) and files per session, and they upload your pictures. Image Optimizer runs whole folders locally, with no upload wall, plus watch folders, watermarks, PDF, cutout, and upscale. You do need a desktop app and a local image engine (bundled on Windows, one-click install on macOS).
Contact: contact@once.work