Make It Tiny

A free, offline image optimizer that runs entirely in your web browser. Drag, drop, or paste images to shrink their file size — nothing is ever uploaded. All encoding happens locally in your browser, so your images never leave your device.

By Al Sweigart.

Features

• Formats: encode to WebP, JPEG, PNG, or AVIF — or keep each image's Original format (pasted images become WebP).
• Quality control: a quality slider for lossy formats, and an "Allow lossy optimization" option for formats that can be lossless (PNG/WebP/AVIF/Original).
• Resize: optionally scale images down to fit, by max pixel dimensions or by percentage.
• Strip metadata: remove EXIF/GPS and other metadata (or keep it — EXIF is re-embedded from the source by default).
• Gallery: a before/after comparison view with a draggable slider to judge the quality loss, plus the file-size, dimension, and format changes as stats.
• Batch friendly: add many images at once; download them all as a .zip or as separate files, reprocess with new settings, or clear the queue.
• Add images any way you like: drag-and-drop, click to choose files, or paste (Ctrl+V).
• Localized: the interface is translated into ~39 languages.
• Private by design: no servers, no tracking, no network requests for your images.

How it works

The heavy lifting is done by the jSquash WebAssembly codecs. To keep a page view small (~60 KB), the codec bundle (mit-codecs.min.js) and its .wasm binaries are not embedded in the page — they live as sibling files and are loaded lazily, only when you first optimize an image, and only the codec for the format actually being used.

Files

File	Purpose
make-it-tiny.html	The app (unminified, commented). This is the multi-file build.
mit-codecs.min.js	The jSquash codec bundle.
webp_enc.wasm, mozjpeg_enc.wasm, avif_enc.wasm, squoosh_oxipng_bg.wasm	The WebAssembly encoders, loaded on demand.
make-it-tiny-og-preview.png	Social-share preview image (Open Graph / Twitter card).
make_offline_makeittiny.py	Builds the single-file offline version (see below).

Running it

Multi-file build (default)

Serve the folder over http(s) and open make-it-tiny.html. A web server is required because browsers block the Worker/module fetches used to load the codecs from file:// URLs. Any static server works, e.g.:

python3 -m http.server
# then open http://localhost:8000/make-it-tiny.html

Single-file offline build

To get one self-contained .html that runs by double-clicking it — no web server, fully offline — run:

python3 make_offline_makeittiny.py

This reads make-it-tiny.html, inlines the codec bundle and its .wasm binaries (as data: URLs), flips the app's EMBEDDED_OFFLINE build flag, and writes make-it-tiny-offline.html (~5.8 MB). Open that file directly from a file:// URL.

Note: in the offline build the codecs run on the main thread (module Workers can't load from a file:// page), so a very large batch will feel a little less responsive than the served version. The result is identical.

Privacy

Everything runs in your browser. No image data is uploaded, and there are no analytics or third-party network calls. The app — and the images you optimize — stay entirely on your device. Keep the offline build (or the page plus its codec files) and you own a working copy forever.