What is the best size for email images?

For most newsletters use 600-800px wide, under 200KB. resize.email auto-optimizes to 600px and 150KB for perfect inbox delivery.

Will resizing reduce quality?

No. Our smart compression keeps visual quality at 92+ while reducing file size by up to 87%.

Is resize.email free?

Yes, core resizing is free and unlimited. No signup needed, files are processed in browser and never uploaded.

resize.email — Resize Images for Email in Seconds

Built for inboxes,
not just browsers.

Email clients block heavy images, break layouts and clip messages over 102KB. We fix all of that automatically — size, weight, format and dimensions in one flow.

⚡ Smart compress to <200KB

Reduce JPG, PNG, WebP by 87% with AI quality control. No pixelation, no blur — just fast-loading inbox visuals.

✂️ One-click email presets

Newsletter 600px, header 1200px, avatar 200px, signature 320px, retina 2x. Perfect dimensions for Mailchimp, Klaviyo, HubSpot.

🔒 Private by design

Images are processed locally in your browser. Nothing uploaded, nothing stored. Ideal for contracts, IDs and client work.

📦 Batch resize 50 photos

Drag a whole product shoot and export all at once as ZIP. Keep filenames, add suffix _email, auto-convert HEIC to JPG.

📧 Fix Gmail clipping & Outlook

We strip EXIF, fix orientation, convert to sRGB and ensure total message stays under Gmail's 102KB clip limit.

🔄 Convert anything

HEIC → JPG, WebP → JPG, PNG → JPG, GIF optimization. Transparent backgrounds flattened cleanly for Outlook.

From 8MB chaos to inbox-ready in 3 steps.

Upload

Drag & drop JPG, PNG, WebP, GIF or HEIC. No signup, no watermark.

Choose preset

Pick Newsletter 600px, Retina 1200px or custom width + max KB slider.

Optimize

Our engine compresses, sharpens and converts to sRGB automatically.

Download & send

Get single file or ZIP, paste straight into Gmail or Mailchimp.

Person resizing images on laptop for email campaign

Live proof

87% smaller. 100% sharp.

Original DSLR photo: 6000×4000, 8.4MB — will bounce or clip in Gmail. After resize.email: 800px, 142KB, loads in 0.3s on 4G.

BEFORE • 8.4MB ❌ slow Heavy original image before compression

AFTER • 142KB ✅ instant Optimized lightweight image after resize

12M+images resized

87%avg. size saved

0.8savg. processing

190countries using

We hate slow emails as much as you do.

resize.email started in 2021 when our founder sent a 25MB lookbook to 4,000 subscribers — and broke every inbox. Gmail clipped it, Outlook blocked it, iPhones refused to download it. So we built the tool we wished existed.

Email-first image lab ✉

Unlike generic compressors, we obsess over email quirks: Outlook's lack of transparency, Gmail's 102KB clip, Apple Mail's retina scaling, dark-mode backgrounds, DPI weirdness. Every preset is tested in 40+ real clients via Litmus-style QA.

Tested in Gmail, Outlook 2016-2024, Apple Mail, Yahoo, Thunderbird — pixel-perfect everywhere.
Photographer-grade quality: Lanczos resampling + mild sharpening + sRGB lock.
Zero upload: WebAssembly processes files on-device. GDPR & HIPAA friendly.
Free forever core: unlimited resizes, no account. Pro adds batch + API.

Today 340,000 marketers, recruiters, realtors, photographers and HR teams use resize.email monthly to send lighter, faster, more beautiful emails. Our mission for 2026: make every email load in under 1 second — even on a train in the countryside.

Try the tool Read our guides

resize.email team working on email optimization

🎯 Our promise

No spam, no signup walls, no selling data. Just a blazing-fast resizer that respects your time and privacy.

🌍 Sustainability

Lighter images = less CO2. We've saved 41TB of transfer — equal to 9 years of Netflix streaming.

🛠 Roadmap 2026

Background remover, signature generator, Figma plugin and direct Gmail add-on. Stay tuned via news below.

Questions? Sized down.

What is the best image size for email?

Use 600-800px wide, max 200KB. For full-width headers use 1200px (retina) but keep under 300KB. Avatars 200×200, signatures 320px wide. resize.email presets do this automatically.

How to reduce photo size for Gmail attachment?

Drag your photo into resize.email, choose Gmail preset (800px, 180KB), download and attach. A 5MB iPhone photo becomes ~150KB with no visible loss.

Why are my images blurry in Outlook?

Outlook scales images oddly and ignores transparency. Export as JPG sRGB at exact display size (e.g., 600px, not 2000px) and add width attribute. Our Outlook fix does this.

Is it safe to resize ID or contract scans?

Yes — processing happens in your browser via WebAssembly. Files never leave your device, nothing is uploaded to servers.

Can I resize many images at once?

Yes, batch mode handles up to 50 images and gives you a ZIP with _email suffix, preserving folders and names.

Latest from the lab.

Tutorials on email image sizes, deliverability, compression tricks and product updates. Click any card to read full article.

Jan 12, 2026

Perfect newsletter image size for 2026

Why 600px still rules, when to go 1200px retina and how to stay under Gmail clip...

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Feb 02, 2026

Compress without losing quality: 7 tricks

JPG vs WebP, sRGB, sharpening and DPI myths debunked for email marketers...

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Mar 18, 2026

Fix blurry images in Outlook in 30 seconds

The exact export settings that stop Outlook from ruining your header...

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Resize images for email without the bounce.