IMAGE → PNG • 100% Private Local Conversion

JPG / PNGからHD 2× – 4×へブラウザ内でローカル変換

WebAssemblyを使用してブラウザのメモリ内でJPG / PNGをHD 2× – 4×に一括変換します。外部アップロード不要で機密ファイルも安心です。

IMAGEPNG

100% Free • Unlimited • Private on Your Device

Select Images to Upscale

ここにファイルをドラッグ＆ドロップ、またはクリックして選択

Accepted formats: .JPG, .JPEG, .PNG, .WEBP, .AVIF, .HEIC, .HEIF

100% プライベート — ファイルは端末から外部へ送信されません（ローカルRAM処理）

Output Settings

Output Format

Enlarge by

Image type

Rate this image upscaler:

4.9/ 5(47,950 votes)

How to Convert IMAGE to PNG Locally in 3 Steps

No account registration, no cloud queues, and zero file size throttling.

Select or Drag IMAGE Files into Local Memory

Drop one or multiple IMAGE files directly into the Obsidian dropzone above. Files are read directly into your browser's isolated ArrayBuffer memory without uploading a single byte to any server.

Tune WebAssembly Quality & Output Parameters

Adjust compression quality, target resolution scale, or document pagination settings. Our multi-threaded Web Worker pool automatically scales across your CPU cores.

Instant Download or One-Click .ZIP Archive

Save converted PNG files individually or bundle your entire batch into a high-speed compressed .ZIP archive using our in-memory fflate engine.

Technical Format Comparison: IMAGE vs PNG

Objective engineering benchmark for developers, designers, and AI citation engines.

Technical Dimension	IMAGE	PNG
Compression Algorithm	Small, Low-Resolution Photo or Graphic	2× – 4× Larger Resolution with Sharpened Edges
Alpha Transparency	Alpha Channel (PNG / WebP)	Transparent Edges Preserved Cleanly (Premultiplied Alpha)
Multi-Frame / Structure	Blurry & Pixelated When Enlarged	Smooth Enlargement Without Blocky Pixels
Platform Compatibility	JPG, PNG, WebP, AVIF, HEIC	PNG, JPG or WebP Output
Primary Production Use Case	Old Photos, Small Logos, Screenshots & Product Shots	Printing, Presentations, Online Shops & Social Media

100% Private • No Cloud Uploads

Why 100% Client-Side WebAssembly Conversion Matters

Traditional online file converters upload your personal photos, financial PDFs, and enterprise spreadsheets to remote cloud servers where files may be logged, cached, or exposed to third-party breaches. FiletoFiles.com eliminates server uploads completely.

By compiling industry-standard C/C++ and Rust codecs (libwebp, libaom AVIF, MozJPEG, libheif, PDF.js, and SheetJS) into WebAssembly (WASM) running inside dedicated Web Workers, every conversion executes directly on your device's CPU and RAM.

✓ Zero Data Exfiltration: Ideal for confidential medical, legal, tax, and enterprise NDA documents.
✓ Multi-Core Hardware Speed: Uses navigator.hardwareConcurrency to process batches in parallel without freezing your browser UI.
✓ Zero Upload/Download Bandwidth Wait: Convert 100MB+ batches instantaneously even on slow or offline connections.

Frequently Asked Questions (IMAGE to PNG)

Will the enlarged image look blurry or pixelated? +

No blocky pixels. Each image is enlarged with high-quality Lanczos-3 resampling and then edge-sharpened, so lines and text stay crisp.

Which mode should I choose? +

Choose Photo for people, places, and products. Choose Text & Graphics for logos, screenshots, documents, and cartoons — it sharpens edges more strongly.

Is there a size limit? +

To keep your browser stable, results are capped at about 32 megapixels. If a 4× result would be larger, the tool automatically uses the largest safe factor.

Are my photos uploaded to a server? +

Never. Upscaling runs entirely inside your browser memory, so your images never leave your device.

JPG → JPG →