How can I verify that my images are not being uploaded?

Open your browser's DevTools (F12), go to the Network tab, and filter by "Fetch/XHR" or "Img". Add an image to Asset Melt Studio and process it. You will see no outbound requests carrying your image data — only the initial load of app code and codec bundles.

Does "no upload" mean the tool works offline?

Yes. Once the app and codec modules are cached in your browser, Asset Melt Studio works with no internet connection. You can install it as a PWA for a dedicated offline experience.

What formats does the privacy-first studio support?

Input: JPEG, PNG, WebP, AVIF, HEIC/HEIF, GIF, TIFF, BMP, SVG, JXL, QOI. Output: JPEG (MozJPEG), PNG (Oxipng), WebP, AVIF, JXL, QOI. All conversions happen locally.

Is there any analytics or tracking?

The site uses privacy-oriented analytics to measure aggregate page usage (page views, format choices, export counts) — not the contents, filenames, or pixels of your images. Your images are never included in any analytics event.

Can I use this for confidential or sensitive images?

Yes. Because nothing is uploaded, Asset Melt is suitable for medical scans, legal documents, client work under NDA, or any image you would not want on a third-party server.

Zero uploads · 100% local

Image compression that respects your privacyyour files never leave your device

Most online image tools upload your files to a server. Asset Melt is different — compression, conversion, resizing, and cropping all run locally in your browser using WebAssembly. No upload. No server. No account. Just results.

Try it — no upload, no account See how it works

Why Asset Melt

Built for this exact job

Everything you need — no uploads, no accounts, no compromises.

No upload — ever

There is no server endpoint that receives your images. The app has no upload mechanism by design, not policy.

Processed on your device

WebAssembly codec modules run in your browser's Web Workers. Your CPU does the work — locally, privately, offline if needed.

No account required

No email, no sign-up, no login. Open the Studio and start compressing immediately. There is nothing to register for.

Professional-grade codecs

MozJPEG, AVIF (rav1e), WebP, Oxipng, and JXL — the same @jsquash WASM engines that powered Google Squoosh.

How it works

Three stepsno upload step

Open the studio, process your files locally, and download — all in your browser.

Open the Studio

Go to assetmelt.com/studio — no install, no account, no permission to access your camera roll. Works in any modern browser.

Drop your images

Add files by drag-and-drop, click-to-browse, or paste from clipboard. Nothing is sent anywhere at this step or any step.

Compress and download

Choose your format and quality, preview the result, and download directly to your device. The browser never contacts a remote server for image data.

Why most image compressors are a privacy risk

Upload-based tools are convenient, but they create a problem: your images pass through infrastructure you do not control. Even "reputable" services retain files for minutes or hours, may log filenames and metadata, and are subject to data breaches, government requests, or unexpected policy changes.

For personal photos, design mockups, client documents, or any image containing sensitive information, that trade-off is not worth it — especially when a browser-based alternative exists that delivers the same quality.

How browser-based compression protects you

Asset Melt is a static web application. When you open it, your browser downloads the app code and WebAssembly codec modules from a CDN — the same way it downloads any website. After that, everything runs locally.

When you add an image, it is decoded in a Web Worker on your CPU. Resizing, colour-space conversion, and re-encoding all happen in the same sandboxed thread. The output file is generated in memory and downloaded directly to your device. At no point does the image data travel over the network.

This is not a soft privacy policy — it is a technical constraint. The app has no upload endpoint. If you inspect the network requests in your browser's DevTools while processing images, you will see none related to your files.

Who needs privacy-first image compression

Medical and legal professionals handling sensitive document scans. Designers working under NDA. Photographers protecting client work before delivery. Developers compressing internal screenshots. Anyone who has ever paused before clicking "upload" and wondered where their file actually goes.

Asset Melt is also practical for everyday use: it supports batch processing, HEIC conversion, AVIF and WebP output, size-budget encoding, and platform presets — not just a privacy checkbox, but a fully-featured studio that happens to keep your files private.

Comparison

Asset Melt vsUpload-based tools

A side-by-side look at what you get.

Feature	Asset Melt	Upload-based tools
Images stay on your device	Yes — always	No — server upload
Works offline	Yes (PWA install)	No
Account required	No	Often yes
File size limits	None	Usually yes
Batch processing	Yes + ZIP export	Varies
Professional codecs	MozJPEG, AVIF, WebP	Varies
Free	Yes, no paywalls	Freemium tiers

FAQ

Common questions

Quick answers before you open the studio.

More tools

Other ways Asset Melt can help with your images.

Squoosh alternativeSquoosh AlternativeLooking for a Squoosh alternative? Asset Melt uses the same WASM codecs as Google Squoosh, plus batc…Learn more

Batch processingBatch CompressorCompress multiple images at once in your browser. Free batch image compression with ZIP export, befo…Learn more

Format conversionHEIC to JPGConvert HEIC and HEIF photos to JPG in your browser. Free, no upload, no account. iPhone photos stay…Learn more

Ready to try it?

Open Asset Melt Studio — free, no account, no uploads. Your files stay on your device.

Try it — no upload, no account