Resize for Substack
Make your photos newsletter-ready before they go into a Substack post. This free tool resizes a batch of images to a 1200 pixel width, keeps each one's original proportions and saves JPGs at the quality you set, so photographers sharing stories, galleries and behind-the-scenes posts get sharp images that load quickly.
Are you a photographer?
Our free tools are built for working photographers — to prep, convert and deliver images without leaving the browser. They’re reserved for photographers, so tell us first.
Unlock every free tool
Sign up or log in to Imagen — it’s free and takes a minute. You only do it once, and every tool on this site opens for you.
These tools are for photographers
We built them for working photographers, so they’re not open to other visitors. Thanks for stopping by.
Loading the tool…
Imagen cuts editing time by up to 96%
Stop spending countless hours on repetitive editing tasks.
Focus on what matters most: your creativity and your clients.
96% Faster editing
Cut your post-production time dramatically with AI-powered automation.
Instant color correction
Apply consistent edits across hundreds of photos in seconds, not hours.
Automated culling
Let AI identify and remove blurry shots, duplicates, and closed eyes automatically.
Batch processing
Edit entire events shoots or portrait sessions while you focus on your next creative work.
Expert Support for Photographers 24/7
Ask us anything, connect with our customer success team.
We go beyond troubleshooting - we’re your partners in optimizing workflows and realizing your creative vision.
No credit card required.
- Faster editing time
- 96%
- Saving on editing costs
- 90%
- Typical turnaround
- 24h
Reviews from those who know best.
Rated 5 out of 5
“The term 'game changer' gets thrown out a lot, but for any busy photographer, this software will change your life.”
Michael AntonyMichael Antony Photography, USARated 5 out of 5
“My survival is due to Imagen… I would MARVEL at how little I had to adjust.”
Charmi Patel PeñaWedding Photographer, USA
Rated 5 out of 5
“It’s so refreshing to start with a high level of quality, and it leaves me with much more energy to spend on my favorite photos.”
Sam HurdSam Hurd Photography, USARated 5 out of 5
“Discovering Imagen has been like someone inventing toilet paper. Simply essential and now life is unthinkable without it. I now know that those years of editing backlogs are a thing of the past. I'm truly grateful.”
Sarah EdmundsPortrait & Wedding Photographer, Italy
Rated 5 out of 5
“It’s a must for me after my culling process. Love Imagen since day one.”
Fer JuaristiFer Juaristi Photography, MexicoRated 5 out of 5
“Thanks to Imagen, I can actually enjoy editing… I have recovered hundreds of hours back.”
Daniel AlonsoPeople TrueLove Tellers, Spain
Frequently asked questions
What size images work best on Substack?
The tool targets a width of 1200 pixels, which it notes is where Substack images look best. That is wide enough to stay sharp across the full post column on most screens while keeping files light enough for readers on mobile data. Height is not fixed: it follows each photo's own aspect ratio, so portraits stay tall and landscapes stay wide.
How do I resize photos for Substack?
Click the area labeled Click or Drag to upload images and choose one or more photos. They appear in a list with a Ready status, and the Optimization Quality slider appears. Adjust the quality, then press Resize for Substack. Each image is resized and downloaded with substack_ added to the front of its name. Use Clear to remove the list.
Will my photos be cropped?
No. Every image is scaled so its width is exactly 1200 pixels and its height changes in proportion, so nothing is cut off and nothing is stretched. Note that images narrower than 1200 pixels are enlarged to that width, which can soften them, so it is best to start from full-resolution exports rather than small web copies.
What quality setting should I use?
The slider runs from 10 to 100 percent and starts at 85, a sensible balance for newsletters: images look clean while files stay small enough for fast loading in inboxes and browsers. Raise it for photos with delicate gradients, such as skies or studio backdrops, and lower it if a post holds many large images. Output is always JPG.
How can photographers build a better photo newsletter?
Resize every image in a post to the same width so the layout feels consistent, and group related frames together rather than scattering them. Lead with your strongest image, since it often becomes the preview in readers' inboxes. Finishing your color edit before resizing keeps the set cohesive. Imagen can help there by applying your personal editing style across a whole shoot first.
Is the Substack image resizer free?
Yes. It is free, adds no watermark and does not require any software. Resizing runs in your browser, so your photos are processed on your own device and are never uploaded. On first use you confirm you are a photographer and create or log into a free Imagen account, which unlocks every tool in the collection.
