Photo Compressor app template

Pick a photo, shrink it natively with size and quality sliders, then save or share it.

MediaWorks offline5 phone features

This is the template running live. Phone features such as the camera, vibration and notifications work in the app you build.

Phone features this template uses

These come from the FreeApp JavaScript bridge that every app built with Free HTML to APK includes. In a normal browser the template still runs, and the calls simply do nothing.

Pick files

FreeApp.pickFile()

Image compression

FreeApp.compressImage()

Native, fast on low-end phones.

Save to gallery

FreeApp.saveToGallery()

Saves an image to Photos.

Share files

FreeApp.shareFile()

Share a real file.

Toast messages

FreeApp.toast()

Short native toast.

How the template calls them

const f = await FreeApp.pickFile({ accept: ['image/*'] });
const small = await FreeApp.compressImage(f.dataUrl, { maxSize: 1280, quality: 80 });
console.log(f.size, '->', small.bytes);

Make it yours with AI

Copy this prompt into ChatGPT, Gemini or Claude, change the idea to yours, and paste the answer back into the editor. It already explains the app shell and the phone features to the AI.

Show the AI prompt

Build a single-file mobile web app (index.html with inline CSS/JS) for Android WebView.

The app: Photo Compressor — a photo compressor that shows the before/after size and saves the smaller image. Pick a photo, shrink it natively with size and quality sliders, then save or share it.

Requirements:
- Mobile-first, touch-friendly UI (min 44px tap targets), works in portrait, supports light and dark mode.
- Use <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"> and pad for env(safe-area-inset-*).
- Must work fully offline: no CDN or external scripts, fonts or images; persist data in localStorage.

The page runs inside an Android app that injects a native bridge as window.FreeApp. Available APIs:
- FreeApp.pickFile(opts?: {accept?: string[], multiple?: boolean}): Promise<{name, mime, size, dataUrl}>
- FreeApp.compressImage(dataUrl: string, opts?: {maxSize?: number, quality?: number}): Promise<{dataUrl, width, height, bytes}> — native, fast on low-end phones
- FreeApp.saveToGallery(dataUrl: string, fileName?: string): Promise<{uri}> — saves an image to Photos
- FreeApp.shareFile(fileName: string, mimeType: string, base64OrDataUrl?: string): boolean — share a real file (omit the data to share an app file by name)
- FreeApp.toast(message: string): void — short native toast

Rules for the bridge:
- Always guard calls with `window.FreeApp &&` (or `if (window.FreeApp) { … }`) and provide a browser fallback so the page also works in a normal browser.
- The bridge may be injected after your script runs: do native setup inside `window.addEventListener('freeappready', …)` and also run it immediately if window.FreeApp already exists.
- Do not use alert/confirm for normal feedback; prefer FreeApp.toast when available.

Return the complete index.html in one code block.

My idea: [DESCRIBE YOUR APP IDEA HERE]

Turn it into an Android app

Tap Edit & build online. The template opens in the online editor.
Change the text, colors and code, then pick an app name, an icon and a package name.
Build. You get a signed APK to install and an AAB for Google Play, free, with no account and no watermark.

✏️ Edit & build online GET IT FREE ONGoogle Play