skwish

private

browser-based

Compress images for Substack

Heavy images slow your Substack posts and can bloat the email version your subscribers receive. Skwish compresses your Substack images locally in the browser so every post loads fast and delivers cleanly.

Search match

This page is tuned for compress image for substack so visitors land in the right workflow immediately.

Fast output

See original size, compressed size, and percentage saved before you move on.

Batch ready

Compress multiple files and pull the results down as a ZIP.

Get to the compressor fast

Exact-intent SEO page first. Clear next step. Pretty later.

People usually search for a specific task, not a brand story. So this page keeps the promise simple: compress images without sending them to a third-party server.

Built for people searching “compress image for substack”, not a generic landing page.

No uploads, no accounts, no waiting on a server.

See the savings before you download anything.

Batch export stays available when the job is bigger.

Best for this search

Compress header images and inline photos before publishing a Substack post so the article loads fast for readers on any device.

Shrink screenshots and charts for data-driven posts to keep the email version light and avoid clipping in inboxes.

Batch-compress a set of images for a Substack issue and download them as a ZIP for quick uploads.

Compress images now

Opens the upload box on the free browser compressor.

Drop images in the browser

Keep the whole workflow local. Nothing leaves your device unless you download it.

Set the output you need

Adjust compression until the file size and quality fit the job instead of guessing.

Download a clean result

Save one file or a ZIP bundle with skwish-prefixed names so the output is easy to find.

Substack image optimization tips

Use these before you upload or share the page.

Aim for under 200KB per image — Substack sends an email version too, and oversized images get clipped in Gmail and Outlook.

Use JPEG at 80% quality for photos; keep PNG only for logos and sharp graphics.

Resize to your post content width (about 1200px) before uploading — larger originals slow both the web post and the email.

Ready to compress images?

Open the free browser upload box, keep files local, and download the optimized result.

Compress images now

Related tools

Other compression pages built for specific size limits and formats.