What is Gami UI Editor?

Gami UI Editor is a free, browser-based tool that automates the Unity UI workflow. It batch-converts 9-slice sprite images into ready-to-import Unity prefab ZIPs, parses PSD files into auto-cropped prefabs, and optimizes images to WebP. All processing runs locally in the browser using WebAssembly — no image data is uploaded to any server. Free, no account required, processes up to 30 files per batch.

How does the auto 9-slice detection work?

Gami UI Editor scans each sprite's pixel data on the client to find the largest stretchable interior region. It detects edges by analyzing alpha and color uniformity along each border, then sets the top, right, bottom, and left 9-slice values to preserve corners and edges during scaling. Detected borders can be reviewed and adjusted via drag-guides or numeric inputs before export.

Does Gami UI Editor process images locally or on a remote server?

Gami UI Editor processes all images locally on the user's device. The tool uses a WebAssembly (WASM) build of Google's libwebp library plus client-side canvas pixel scanning for 9-slice detection. No image data is transmitted to any server at any point in the workflow. This is verifiable by inspecting Network DevTools — zero outbound image requests are recorded during any conversion or batch operation.

Is Gami UI Editor free to use, and does it require registration?

Gami UI Editor is free to use with no registration required for the WebP optimizer. Unity prefab export uses a small daily credit allowance (refilled every 24 hours) to keep the service sustainable; signed-in users get more credits per day. Every core feature — batch conversion of up to 30 files, quality control, bulk resize, in-browser ZIP export, and 9-slice auto-detection — is available on first visit.

How does WebP format affect page load speed and SEO rankings?

WebP files are 25-34% smaller than JPEG and 60-80% smaller than PNG at equivalent perceptual quality. Smaller image files reduce the payload of the Largest Contentful Paint (LCP) element — a Core Web Vitals signal Google uses as a direct ranking factor in organic search. Converting images to WebP resolves the "Serve images in next-generation formats" warning in Google Lighthouse and PageSpeed Insights audits.

How efficient is Gami UI Editor for batch-processing large image sets?

Gami UI Editor encodes up to 30 images simultaneously using parallel Web Workers, so total batch processing time does not scale linearly with file count. All converted files are packaged into a single ZIP archive assembled entirely in-browser without server involvement. Users can run unlimited batches per session, with no queue and no wait time between jobs.

Which operating systems and browsers does Gami UI Editor support?

Gami UI Editor runs on any operating system — Windows, macOS, Linux, iOS, and Android — in any browser that supports WebAssembly and the File API: Chrome 57+, Firefox 52+, Safari 11+, and Edge 16+. No installation, plugin, or browser extension is required. The tool also deploys as an offline-capable Progressive Web App installable on desktop and mobile home screens.

How do I import the exported prefab ZIP into Unity?

Install the GamiPrefabImporter Editor utility (free, MIT-licensed, available from the Unity importer page) into your Unity project under Assets/GamiPrefabImport/Editor. Drag the exported ZIP into your project window. The importer reads each layout.json, creates Unity sprites with the correct 9-slice borders and pixels-per-unit, and assembles them into ready-to-use UI prefabs — including Button components if marked during export.

Can Gami UI Editor convert images without an internet connection?

Yes. Gami UI Editor functions fully offline after the first page load. A Service Worker (v6) caches all application assets including the WebAssembly encoder on first visit. Users can install it as a Progressive Web App and run batch WebP conversions on an air-gapped device with no network access required. (Unity prefab export is the one feature that needs network access, since it calls a credits API.)

Your images never leave
your computer.

ArtEditor.art is built on a local-first architecture. Every image operation runs entirely inside your browser. Nothing is uploaded, stored, or transmitted.

Zero uploadsNo account requiredNo data soldGDPR compliant

Last updated: March 31, 2026 · Operated by BRAVE GAMES PTE. LTD., Singapore

1. Zero-Upload Guarantee

ArtEditor.art processes all images using WebAssembly (WASM) and the browser's built-in Canvas API. Your images are loaded directly into your device's RAM — they are decoded, transformed, and re-encoded entirely within your browser tab.

No image data, pixel data, or file metadata is ever transmitted to any server. We operate with zero server-side image infrastructure. There are no upload endpoints, no cloud storage buckets, and no image processing pipelines on our backend.

When you close your browser tab, all image data is immediately garbage-collected by the browser. Nothing persists beyond your session unless you explicitly save the file to your own device.

2. Data We Collect

We collect zero personal data. Specifically:

We do not collect your name, email address, or any account information.
We do not collect the images you process.
We do not collect file names, file sizes, or conversion results.
We do not build user profiles or track individual behavior.

We may collect anonymous, aggregated technical performance signals (e.g., browser type, WASM support status) solely to improve engine reliability. These signals contain no personally identifiable information and cannot be used to identify you.

3. Cookies & Google AdSense

ArtEditor.art uses Google AdSense to display advertisements. Google AdSense uses cookies and similar technologies to serve ads based on your prior visits to this website and other websites across the internet.

Google's use of advertising cookies enables it and its partners to serve ads based on your visit to ArtEditor.art and/or other sites on the Internet. You may opt out of personalized advertising by visiting Google's Ads Settings. Alternatively, you may opt out of a third-party vendor's use of cookies by visiting the Network Advertising Initiative opt-out page.

We also use minimal functional cookies to remember your format preferences (e.g., last selected output format). These cookies are stored locally, do not contain personal data, and expire within 90 days.

4. Third-Party Services

We integrate the following third-party services:

Google AdSense

Advertising revenue to keep the tool free · Privacy Policy

Google Fonts (optional)

Typography (loaded only if not already cached) · Privacy Policy

Vercel

Website hosting and CDN delivery · Privacy Policy

5. Children's Privacy

ArtEditor.art does not knowingly collect any information from children under 13 years of age. The service is a general-purpose image utility tool and is not directed at children. If you are a parent or guardian and believe your child has provided personal data, please contact us and we will take appropriate action.

6. Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top of this page will reflect any changes. We encourage you to review this policy periodically. Continued use of ArtEditor.art after any changes constitutes acceptance of the updated policy.

7. Contact

For any privacy-related questions or requests, please contact us at:

BRAVE GAMES PTE. LTD.

Singapore 🇸🇬

bravegames@brave-games.com

WASM Engine: ActivePrivacy: Local-FirstData: Zero UploadsStatus: Operational

Your images never leaveyour computer.